Any advantage to “floating” rear disc brakes?

Aceofspades
Edited Date/Time 1/30/2021 2:46pm
In 86 when Kawasaki had rear disc introduced there was talk of it “locking up” the rear shock. KTM had a torque arm connecting the rear caliper hanger to the frame for a floating disc but then went the way everyone else went and rigidly mounted the caliper hanger to the swing arm. Besides weight, is there any reason they all went the rigid mount design? It seems just through thinking about it that allowing it to transfer torque forces to the frame would be better for the suspension I would think. Anyone know?
|
#434
Profile picture for user #434
Posts
1912
Joined
3/23/2017
Location
DE
#434 1/26/2021 11:08pm
1/26/2021 11:08pm
One advantage was that the torque of the brake wasn‘t transferred to the swing arm and so the arm was not bent while braking, adding stress to it‘s spaghetti like structure. With the much larger and stiffer swing arms of today that‘s no longer a problem.
Another is that you can design it in a way that the force coming through the arm pushs the suspension up or down while breaking. Ducati has/had it on their motoGP bikes. I think Honda even put pivot and a second arm on the bike to manage the force coming through the arm.

2
Ozzy
Profile picture for user Ozzy
Posts
1116
Joined
4/1/2008
Location
Santa Clarita, CA, USA
Ozzy 1/26/2021 11:49pm
1/26/2021 11:49pm
It’s HUGE!!
40 plus yrs in the game says so.
The positive affects on rear suspension & braking
are HUGE!!!
The system’s a plus for any bike!!
Modern or otherwise.
Yet, ALL the Manufacturers did away with em!!
Cost? Yes.
Foolish Decision? ...HONESTLY, YES.
6
inthebadboycorner 1/27/2021 12:01am
1/27/2021 12:01am
Ozzy wrote:
It’s HUGE!! 40 plus yrs in the game says so. The positive affects on rear suspension & braking are HUGE!!! The system’s a plus for any...
It’s HUGE!!
40 plus yrs in the game says so.
The positive affects on rear suspension & braking
are HUGE!!!
The system’s a plus for any bike!!
Modern or otherwise.
Yet, ALL the Manufacturers did away with em!!
Cost? Yes.
Foolish Decision? ...HONESTLY, YES.
Ozzy, why did no factory team add it as a modification, was it AMA ruling or orders from up top?
#434
Profile picture for user #434
Posts
1912
Joined
3/23/2017
Location
DE
#434 1/27/2021 12:58am
1/27/2021 12:58am
Where could it be mounted instead?

The Shop

See All »
RaceFan
Profile picture for user RaceFan
Posts
361
Joined
1/9/2014
Location
GB
RaceFan 1/27/2021 1:03am
1/27/2021 1:03am
It was covered in MotoGP testing late in 2018.Not a floating caliper but rather a torque bar(dubbed FUBAR).
Used to squat the rear and improve grip or to maintain geometry. It's been around for ages but seems to be very hit and miss on getting it just right.
1
#434
Profile picture for user #434
Posts
1912
Joined
3/23/2017
Location
DE
#434 1/27/2021 1:33am
1/27/2021 1:33am
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake.
1
Bearuno
Profile picture for user Bearuno
Posts
5643
Joined
6/28/2014
Location
AU
Bearuno 1/27/2021 4:50am
1/27/2021 4:50am Edited Date/Time 1/27/2021 4:53am
#434 wrote:
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake. [img]https://p.vitalmx.com/photos/forums/2021/01/27/475288/s1200_gallery_362_402_30398.jpg[/img]
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake.
Well, no, in that, the standard configuration with the top torque arm above the Swingarm pivot, it exerts a 'push' into the frame, thus, looked at alone, it has a tendency to extend the swingarm.

But that extension force , is counteracted by the braking force (the 'drag' of the rear wheel under brakes) that is trying to compress the suspension.

So, the 2 forces counteract each other, to leave the suspension 'free'.

In this case, if the top torque arm was crossing over the swing arm, to below the pivot, it would be producing the "squat" you refer to.

You can vary the Torque / Force put into the swingarm in so many ways, and so many engineers have different views on it all.

You can also look at it as having the tyre contact point to the road surface, being able to be made constant. It Not 'scrubbing' , or accelerating / decelerating relative to the tyre / surface interface. To have that 'perfect', whatever set up you had, you would have to emulate a perfect parallelogram's geometry. Which, is pretty hard to do, with most bikes.

Hell, I'll sell Floating Brake Torque arm sets ups with my DH frames to those that must have no "brake jack" , but I tell them it's a waste of time, for the most part. But, I do get a few that have to have one. More $$$$$ for The Bear....Whistling

I use Floating Rear Brake set ups on my Tar Track motorcycles, as, you can look at it as them having consistent, near perfect traction (of course, they don't ) when compared to the, comparatively, buggerall / limited braking 'traction' that a Dirt Bike has. Even I, a crippled up, slow as a Snail Old Man can notice the benefits on a Road Race track of a Floating Rear Brake, but on the Dirt, it's just not that much of an advantage.

If it were a very significant advantage on a Dirt Bike, you can bet your arse the Factories would have them in use. KTMs first rear disc bikes had them, they were trick, but soon jettisoned.

That you don't see them nowadays, should tell you of their worth on a Dirt Bike - which, no matter how damned good your rear suspension is, your rear wheel is never really under much control.

I know I 'read' as a cynic, but it's a realist approach - unless the weight, vulnerability and complication is offset by enough benefits, it won't be used. And therefore, for the vast part, on Dirt Bikes, it's Not used.

My cynicism aside, it doesn't make me not drool at Hondas early eighties 'Linkaged Floating Rear Brake', though :

Dependent on linkage arm(s), pivot and rod geometries and orientations, you could do damned near anything you chose to with this set up.

But heck, together with the Ribi Front end, you've got at least another 25 bearing / pivot points on this Spectacular bike, over a 'normal' suspension and brake set up .........Woohoo
6
Ozzy
Profile picture for user Ozzy
Posts
1116
Joined
4/1/2008
Location
Santa Clarita, CA, USA
Ozzy 1/27/2021 10:06am
1/27/2021 10:06am
Ozzy wrote:
It’s HUGE!! 40 plus yrs in the game says so. The positive affects on rear suspension & braking are HUGE!!! The system’s a plus for any...
It’s HUGE!!
40 plus yrs in the game says so.
The positive affects on rear suspension & braking
are HUGE!!!
The system’s a plus for any bike!!
Modern or otherwise.
Yet, ALL the Manufacturers did away with em!!
Cost? Yes.
Foolish Decision? ...HONESTLY, YES.
inthebadboycorner wrote:
Ozzy, why did no factory team add it as a modification, was it AMA ruling or orders from up top?
I believe it’s cost & what I call “splitting hairs”.
I tried to get Buell on board with it too.
They modeled it, understood it, & yes, saw the benefits, yet followed suit of the other Manufacturers & was possibly going to be an accessory item sold thru the dealers.
It’s easily proved.
I guarantee, for example, if it was fitted for an outdoor test, lap times & rideability would greatly be improved.
I got Honda somewhat interested in it again while with Chad Reed at TwoTwo Motorsports.
But again, they listened they saw, yet nowadays for some unknown reason to me, it’s passed on!!
For me, if I was ever totally & completely in charge
I’d add 1 for a proper test!!
I built 1 for my ‘89 YZ250 with the help of the Late Richie Arnold, Dave’s brother, & it worked perfectly.
Though I wasn’t Pro speed, it was noticeable in a positive way!!!
Ross Madea of Enzo Fame & I have joked & talked about this plenty over the yrs & he 100% agrees with me on its performance gains..., yet the modern bike’s of today are still without...
It’s just Dollars & Cents...but in reality more like NO SENSE.
Whoever goes back to this will gain a huge advantage in their rear suspension & braking or not!!🤷‍♂️GO FIGURE?
9
Ted722
Profile picture for user Ted722
Posts
4577
Joined
9/21/2011
Location
Sacramento, CA, USA
Ted722 1/27/2021 11:11am
1/27/2021 11:11am Edited Date/Time 1/27/2021 11:13am
Good discussion.

I had an '83CR250, rode a buddies '86CR250 and subsequently bought an '87CR250. Great bike, but certainly noticed the rear brake affect on suspension action in braking bumps. Probably didn't help either that I was only 150lbs back then! Smile

I read somewhere or heard some interviews over the years that top Pro's would drag the rear brake (in the 90's and beyond) to settle the suspension particularly in the whoops. Certainly above my pay grade, but an interesting "benefit" of a non-floating design.

Most interesting though is the counter shaft disc / chain torque elimination from the ATK days. Is there still any benefit to that design with better components of today? Still patented?
#434
Profile picture for user #434
Posts
1912
Joined
3/23/2017
Location
DE
#434 1/27/2021 11:49am
1/27/2021 11:49am
#434 wrote:
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake. [img]https://p.vitalmx.com/photos/forums/2021/01/27/475288/s1200_gallery_362_402_30398.jpg[/img]
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake.
Bearuno wrote:
Well, no, in that, the standard configuration with the top torque arm above the Swingarm pivot, it exerts a 'push' into the frame, thus, looked at...
Well, no, in that, the standard configuration with the top torque arm above the Swingarm pivot, it exerts a 'push' into the frame, thus, looked at alone, it has a tendency to extend the swingarm.

But that extension force , is counteracted by the braking force (the 'drag' of the rear wheel under brakes) that is trying to compress the suspension.

So, the 2 forces counteract each other, to leave the suspension 'free'.

In this case, if the top torque arm was crossing over the swing arm, to below the pivot, it would be producing the "squat" you refer to.

You can vary the Torque / Force put into the swingarm in so many ways, and so many engineers have different views on it all.

You can also look at it as having the tyre contact point to the road surface, being able to be made constant. It Not 'scrubbing' , or accelerating / decelerating relative to the tyre / surface interface. To have that 'perfect', whatever set up you had, you would have to emulate a perfect parallelogram's geometry. Which, is pretty hard to do, with most bikes.

Hell, I'll sell Floating Brake Torque arm sets ups with my DH frames to those that must have no "brake jack" , but I tell them it's a waste of time, for the most part. But, I do get a few that have to have one. More $$$$$ for The Bear....Whistling

I use Floating Rear Brake set ups on my Tar Track motorcycles, as, you can look at it as them having consistent, near perfect traction (of course, they don't ) when compared to the, comparatively, buggerall / limited braking 'traction' that a Dirt Bike has. Even I, a crippled up, slow as a Snail Old Man can notice the benefits on a Road Race track of a Floating Rear Brake, but on the Dirt, it's just not that much of an advantage.

If it were a very significant advantage on a Dirt Bike, you can bet your arse the Factories would have them in use. KTMs first rear disc bikes had them, they were trick, but soon jettisoned.

That you don't see them nowadays, should tell you of their worth on a Dirt Bike - which, no matter how damned good your rear suspension is, your rear wheel is never really under much control.

I know I 'read' as a cynic, but it's a realist approach - unless the weight, vulnerability and complication is offset by enough benefits, it won't be used. And therefore, for the vast part, on Dirt Bikes, it's Not used.

My cynicism aside, it doesn't make me not drool at Hondas early eighties 'Linkaged Floating Rear Brake', though :

Dependent on linkage arm(s), pivot and rod geometries and orientations, you could do damned near anything you chose to with this set up.

But heck, together with the Ribi Front end, you've got at least another 25 bearing / pivot points on this Spectacular bike, over a 'normal' suspension and brake set up .........Woohoo
Yes, you‘re right.
So in most cases it‘s used to balance out the suspension, not to squat the rear?
I wonder what a guy like Stoner, who used a lot of rear brake accelerating, could‘ve done with it.
1
FWYT
Profile picture for user FWYT
Posts
3572
Joined
5/25/2014
Location
San Diego, CA, USA
FWYT 1/27/2021 11:53am
1/27/2021 11:53am
Always love these tech discussions. Carry on.
Aceofspades 1/27/2021 2:45pm
1/27/2021 2:45pm
Reason why I asked the question is that I was looking thru old 1986 magazines and Yamaha was using rear disc brakes on Glovers works yz but it had the floating setup with the torque arm connecting the floating caliper mount to the frame and it made me curious. Surely seems like it would help the rear suspension a lot to have that caliper not hard connected to the swing arm like they all do it nowadays🤷‍♂️
Aceofspades 1/27/2021 2:48pm
1/27/2021 2:48pm
Glovers YZ at Anaheim in 1986
1
Aceofspades 1/27/2021 2:52pm
1/27/2021 2:52pm Edited Date/Time 1/27/2021 2:55pm
Motocross Action magazine made the (very dubious) claim in 1986 when testing the kx125 that “...if you push down on the rear suspension while applying the rear brake, the shock won’t rebound back to full extension. It stay squatted down.” 🤔 I’ve yet to figure out how the physics of that works🤷‍♂️😂 I do know that for that first year of non-floating rear calipers in 86 they constantly bitched about the bikes with swingarm-mounted calipers because it effected the rear suspension action. In 87 when everybody but Yamaha went to rigid mounted calipers they never mentioned it again.
Aceofspades 1/27/2021 2:56pm
1/27/2021 2:56pm Edited Date/Time 1/27/2021 2:58pm
You apparently didn’t read my first post🤷‍♂️ “Floating rear disc brake/torque arm” would’ve shown that’s what I meant.
Aceofspades 1/27/2021 3:02pm
1/27/2021 3:02pm
Ted722 wrote:
Good discussion. I had an '83CR250, rode a buddies '86CR250 and subsequently bought an '87CR250. Great bike, but certainly noticed the rear brake affect on suspension...
Good discussion.

I had an '83CR250, rode a buddies '86CR250 and subsequently bought an '87CR250. Great bike, but certainly noticed the rear brake affect on suspension action in braking bumps. Probably didn't help either that I was only 150lbs back then! Smile

I read somewhere or heard some interviews over the years that top Pro's would drag the rear brake (in the 90's and beyond) to settle the suspension particularly in the whoops. Certainly above my pay grade, but an interesting "benefit" of a non-floating design.

Most interesting though is the counter shaft disc / chain torque elimination from the ATK days. Is there still any benefit to that design with better components of today? Still patented?
Braking bumps is where I’d assume it would really be helpful.
Bearuno
Profile picture for user Bearuno
Posts
5643
Joined
6/28/2014
Location
AU
Bearuno 1/27/2021 7:46pm
1/27/2021 7:46pm Edited Date/Time 1/27/2021 7:54pm
#434 wrote:
Yes, you‘re right. So in most cases it‘s used to balance out the suspension, not to squat the rear? I wonder what a guy like Stoner...
Yes, you‘re right.
So in most cases it‘s used to balance out the suspension, not to squat the rear?
I wonder what a guy like Stoner, who used a lot of rear brake accelerating, could‘ve done with it.
It's an attempt to separate the brake torque affects from the suspension. They can be set up to do that, to varying degrees / levels. There are some engineers / people, that Do want to squat the rear end. That's Not my idea of 'fun', but, each to their own.

At the moment, most notably Ducati, are really trying some 'stuff' with regards to rear end control - much different to / yet sometimes in conjunction with, the usual floating rear brake set ups. 'Rider Switchable' set ups to hold the rear end down / keep the bike 'flatter', to minimize the rear end floating around in the air under brakes, and, it's also, at times, being used under acceleration, from what I can gather - I've yet to see pictures of whatever it is, and, I sure as heck am not getting to any GPs soon to sneak around at.

Stoner had a floating rear brake.

I'm far from sure if he did, or did not, use a thumb brake, which a lot of riders use for varying reasons - your idea being just one of them. I use a thumb brake / LHRB on all of my bikes, because my leg problems preclude me from using a foot brake. I, am slower than a wet week, no matter what I'm riding, nowadays.......

I'd be hard pressed to find an example of MotoGP bike, 500cc GP (road race) and most of the other GP Road Racing class bikes Not using a floating rear brake, for many Decades now.

But, the set up pictured earlier in this thread on a MotoGP Ducati ? Well that is something very, Very different to a typical Floating Rear Brake set up! As a previous poster posited, it affixes to part of the suspension linkage.

Ducati is quite the innovator in so many ways - and as a Ducati owner, frame maker and worker in the Industry for many decades, starting from the old Bevels, when I, and other mates who worked with Ducati here in OZ get to Bench Racing, we all find it bloody remarkable. We all love our Dukes, but we are far from being blind 'Ducatisti'. Though, a few of them do get a bit cranky when I say I'd much prefer a pristine RC30 over a Tricolour 851 Whistling . And, I bloody mean it - which really upsets a few of my cronies.

We'll sit there in the workshop, with, say a MHR restoration job, or a Single, a TT2 etc, etc and there's a V4 Panigale on the stand just a few feet away, and we just Woohoo It boggles the mind. Good god, they've now 170+HP "Adventure Bike" Land Yachts..............Dizzy
1
FGR01
Profile picture for user FGR01
Posts
6150
Joined
10/1/2006
Location
USA
Fantasy
910th
FGR01 1/27/2021 8:23pm
1/27/2021 8:23pm
Because Sikk brake taps Bro. The brake tap in the air was introduced in 1986 and killed the floating brake torque arm.. How ya gonna do sikk brake taps if the torque is transferring into your frame and not your swingarm? Another outdoor MX good idea that was killed by SX.

1

Pit Row

See All »
Aceofspades 1/27/2021 8:31pm
1/27/2021 8:31pm
FGR01 wrote:
Because Sikk brake taps Bro. The brake tap in the air was introduced in 1986 and killed the floating brake torque arm.. How ya gonna do...
Because Sikk brake taps Bro. The brake tap in the air was introduced in 1986 and killed the floating brake torque arm.. How ya gonna do sikk brake taps if the torque is transferring into your frame and not your swingarm? Another outdoor MX good idea that was killed by SX.

That’s an interesting theory lol. 🤔
xrmark
Profile picture for user xrmark
Posts
1122
Joined
9/9/2019
Location
Lake Elsinore, CA, USA
xrmark 1/28/2021 10:16am
1/28/2021 10:16am
You’re a tool.
5
1
dbx33
Profile picture for user dbx33
Posts
247
Joined
8/13/2020
Location
USA
dbx33 1/28/2021 12:23pm
1/28/2021 12:23pm
funny that they had that arm on the ducati. considering 50% of pro riders go all season without touching the rear brake once
Aceofspades 1/28/2021 2:24pm
1/28/2021 2:24pm Edited Date/Time 1/28/2021 2:28pm
It said “floating rear disc brakes” not “floating rear brake disc” you giant bag of dildos. How come everybody else knew what I meant and you didn’t? My main post described exactly what I was talking about, unless you’re just a retard who flies into a post to comment on the post title without reading it?
5
inthebadboycorner 1/28/2021 2:40pm
1/28/2021 2:40pm
#434 wrote:
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake. [img]https://p.vitalmx.com/photos/forums/2021/01/27/475288/s1200_gallery_362_402_30398.jpg[/img]
Here's the setup of the Honda RC30. It has two push-pull arms and a rocker to squat the rear suspension while using the rear brake.
Bearuno wrote:
Well, no, in that, the standard configuration with the top torque arm above the Swingarm pivot, it exerts a 'push' into the frame, thus, looked at...
Well, no, in that, the standard configuration with the top torque arm above the Swingarm pivot, it exerts a 'push' into the frame, thus, looked at alone, it has a tendency to extend the swingarm.

But that extension force , is counteracted by the braking force (the 'drag' of the rear wheel under brakes) that is trying to compress the suspension.

So, the 2 forces counteract each other, to leave the suspension 'free'.

In this case, if the top torque arm was crossing over the swing arm, to below the pivot, it would be producing the "squat" you refer to.

You can vary the Torque / Force put into the swingarm in so many ways, and so many engineers have different views on it all.

You can also look at it as having the tyre contact point to the road surface, being able to be made constant. It Not 'scrubbing' , or accelerating / decelerating relative to the tyre / surface interface. To have that 'perfect', whatever set up you had, you would have to emulate a perfect parallelogram's geometry. Which, is pretty hard to do, with most bikes.

Hell, I'll sell Floating Brake Torque arm sets ups with my DH frames to those that must have no "brake jack" , but I tell them it's a waste of time, for the most part. But, I do get a few that have to have one. More $$$$$ for The Bear....Whistling

I use Floating Rear Brake set ups on my Tar Track motorcycles, as, you can look at it as them having consistent, near perfect traction (of course, they don't ) when compared to the, comparatively, buggerall / limited braking 'traction' that a Dirt Bike has. Even I, a crippled up, slow as a Snail Old Man can notice the benefits on a Road Race track of a Floating Rear Brake, but on the Dirt, it's just not that much of an advantage.

If it were a very significant advantage on a Dirt Bike, you can bet your arse the Factories would have them in use. KTMs first rear disc bikes had them, they were trick, but soon jettisoned.

That you don't see them nowadays, should tell you of their worth on a Dirt Bike - which, no matter how damned good your rear suspension is, your rear wheel is never really under much control.

I know I 'read' as a cynic, but it's a realist approach - unless the weight, vulnerability and complication is offset by enough benefits, it won't be used. And therefore, for the vast part, on Dirt Bikes, it's Not used.

My cynicism aside, it doesn't make me not drool at Hondas early eighties 'Linkaged Floating Rear Brake', though :

Dependent on linkage arm(s), pivot and rod geometries and orientations, you could do damned near anything you chose to with this set up.

But heck, together with the Ribi Front end, you've got at least another 25 bearing / pivot points on this Spectacular bike, over a 'normal' suspension and brake set up .........Woohoo
You know I have looked at this picture dozens of time and been so gob smacked by the Ribi front end that I never notice the rear brake arm.
1
jkoch249
Profile picture for user jkoch249
Posts
88
Joined
10/3/2020
Location
Pardeeville, WI, USA
jkoch249 1/28/2021 5:44pm
1/28/2021 5:44pm
Aceofspades wrote:
Glovers YZ at Anaheim in 1986 [img]https://p.vitalmx.com/photos/forums/2021/01/27/475408/s1200_75AB6021_DFA8_499D_AA4F_F17A5407D0C5.jpg[/img]
Glovers YZ at Anaheim in 1986
That's a "trick" set-up for sure. I wonder how much weight it all adds to the rear end, compared to just bolting it to the swingarm.
1
Chance1216
Profile picture for user Chance1216
Posts
8984
Joined
4/1/2018
Location
Carson, CA, USA
Chance1216 1/28/2021 9:55pm
1/28/2021 9:55pm
Dude, every single thread that pops up you have never said anything positive. Are you just a troll, a worm, or so pathetic you have nothing better to do then act smarter then everyone in every thread? You won’t last long so, there’s that.
5
#434
Profile picture for user #434
Posts
1912
Joined
3/23/2017
Location
DE
#434 1/28/2021 10:29pm
1/28/2021 10:29pm
Chill guys! Was such a nice technical thread..

But to be clear: the thread title was different in the beginning Whistling
3
Aceofspades 1/30/2021 1:47pm
1/30/2021 1:47pm Edited Date/Time 1/30/2021 1:57pm
#434 wrote:
Chill guys! Was such a nice technical thread..

But to be clear: the thread title was different in the beginning Whistling
What was the original thread title? I’m about positive it was what it is now. I’ll say it again: how come everyone else knew what I was talking about except “Mr parallelogram” pretend engineer on the internet? If my first post talks about torque arms then how the fuck do you think I’m talking about a floating brake disc, you butt plug?
Aceofspades 1/30/2021 1:56pm
1/30/2021 1:56pm
This is an example of the kind of shitheads that’ll go on a riders Instagram and act like a retard. Idiots want to show how smart they are when it adds zero to the discussion.
2
1
xrmark
Profile picture for user xrmark
Posts
1122
Joined
9/9/2019
Location
Lake Elsinore, CA, USA
xrmark 1/30/2021 1:58pm
1/30/2021 1:58pm
Aceofspades wrote:
What was the original thread title? I’m about positive it was what it is now. I’ll say it again: how come everyone else knew what I...
What was the original thread title? I’m about positive it was what it is now. I’ll say it again: how come everyone else knew what I was talking about except “Mr parallelogram” pretend engineer on the internet? If my first post talks about torque arms then how the fuck do you think I’m talking about a floating brake disc, you butt plug?
Who cares. Rolls Royce acts like a c*cksucker. Dudes a tool end of thread
1
1
Aceofspades 1/30/2021 2:22pm
1/30/2021 2:22pm
jkoch249 wrote:
That's a "trick" set-up for sure. I wonder how much weight it all adds to the rear end, compared to just bolting it to the swingarm.
According to that article the disc setup was heavier than the drum brake setup which used a magnesium backing plate
2
1

Post a reply to: Any advantage to “floating” rear disc brakes?