Disk brakes

look out below 1/13/2010 6:41pm
1/13/2010 6:41pm
Where did you get the photo? I wouldn't be in a museum would it? Looks familiar.
williamsmotowerx 1/13/2010 7:30pm
1/13/2010 7:30pm
I got it off of someone else in a different forum... It looks like the pic is from the National Motorcycle Museum in Birmingham, England

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look out below 1/13/2010 7:39pm
1/13/2010 7:39pm
ok not the same place as i thought. I went to two museums in STL and they were amazing. They had more bikes than i can remember.
mxrose3
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mxrose3 1/13/2010 8:13pm
1/13/2010 8:13pm
williamsmotowerx wrote:
from 1906... why did it take so long for mainstream? [img]https://img25.imageshack.us/img25/3986/snc11855.jpg[/img]
from 1906... why did it take so long for mainstream?

Good question. Probably the same reason cars had drum brakes for so long....whatever that reason was.
Kawasaki was the first major manufacturer to put a front disc on a mx bike, and it took two more years for the others to follow. Rear discs didn't come for about another 4 years later.

another question would be: Why is it taking the manufacturers so long to move the countershaft sprocket to the swingarm pivot (ala BMW)? It would eliminate some suspension woes caused by chain torque. Think about Bob Hannah's 1986 Boyesen link equipped RM250 he rode at Unadilla.
JOHN CHOATE
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JOHN CHOATE 1/13/2010 8:17pm
1/13/2010 8:17pm
What year did Kaw put discs on their mx bikes? I remember seeing a pull start Rokon in 74 or 75 with disc brakes during the Fla. Winter-Ams.
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MOgle80 1/13/2010 8:20pm
1/13/2010 8:20pm Edited Date/Time 1/13/2010 8:24pm
Yamaha started in 85 for the front on the YZ's and KX was just about two before them
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mxrose3 1/13/2010 8:21pm
1/13/2010 8:21pm
JOHN CHOATE wrote:
What year did Kaw put discs on their mx bikes? I remember seeing a pull start Rokon in 74 or 75 with disc brakes during the...
What year did Kaw put discs on their mx bikes? I remember seeing a pull start Rokon in 74 or 75 with disc brakes during the Fla. Winter-Ams.
82' KX's came with front disc brakes. Yes, Rokon had them much earlier, but Kawasaki was the first major manufacturer to use them.
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MOgle80 1/13/2010 8:22pm
1/13/2010 8:22pm
in that picture it doesnt look like the front wheel but also it doesnt appear to have any chain drive.
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JOHN CHOATE 1/13/2010 8:27pm
1/13/2010 8:27pm
Thanks for clearing that up. I knew I saw them on something else long before the KX's. I started riding the KX 250 and 500 when I was 15(1982). I didn't remember discs brakes on Kaw's before then so it was my first year with them too. I remember thinking how good the discs were. It took me a few races to get used to them.
look out below 1/13/2010 8:30pm
1/13/2010 8:30pm
MOgle80 wrote:
in that picture it doesnt look like the front wheel but also it doesnt appear to have any chain drive.
look to the other side of the rim, it looks like another rim type thing. That may be the drive.
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mxrose3 1/13/2010 8:37pm
1/13/2010 8:37pm
82' KX125:


76' Rokon had front and rear brakes (I think the 75' did also):

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MOgle80 1/13/2010 8:38pm
1/13/2010 8:38pm Edited Date/Time 1/13/2010 8:39pm
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JOHN CHOATE 1/13/2010 8:40pm
1/13/2010 8:40pm Edited Date/Time 1/13/2010 8:41pm
mxrose3 wrote:
82' KX125: [img]http://vintagemx.com.au/wp-content/gallery/kawasaki-kx125-models/1982kx125.jpg[/img] 76' Rokon had front and rear brakes (I think the 75' did also): [img]http://home.ama-cycle.org/membersonly/museum/images/b98/RokonBike_600.jpg[/img]
82' KX125:


76' Rokon had front and rear brakes (I think the 75' did also):

I remember Don "the Killer" Kuldalski racing one of those(Rokon). Thanks for the picture.
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MOgle80 1/13/2010 8:40pm
1/13/2010 8:40pm
look out below wrote:
look to the other side of the rim, it looks like another rim type thing. That may be the drive.
yep now I see it. Rad hehehe
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JOHN CHOATE 1/13/2010 8:42pm
1/13/2010 8:42pm
look out below wrote:
look to the other side of the rim, it looks like another rim type thing. That may be the drive.
MOgle80 wrote:
yep now I see it. Rad hehehe
Yeah, like the sprocket is nearly as big as the rim.
look out below 1/13/2010 8:45pm
1/13/2010 8:45pm
look out below wrote:
look to the other side of the rim, it looks like another rim type thing. That may be the drive.
MOgle80 wrote:
yep now I see it. Rad hehehe
JOHN CHOATE wrote:
Yeah, like the sprocket is nearly as big as the rim.
i think that may be for the gearing to push start it. It may be before kick starters. I could be wrong but there was one like that at the museum i went to.

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look out below 1/13/2010 8:48pm
1/13/2010 8:48pm
If i wasnt a computer dummy i could post the photo of the bike im talking about, but i am, so, sorry fellas.
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gsxrcr28 1/13/2010 8:49pm
1/13/2010 8:49pm
mxrose3 wrote:
82' KX125: [img]http://vintagemx.com.au/wp-content/gallery/kawasaki-kx125-models/1982kx125.jpg[/img] 76' Rokon had front and rear brakes (I think the 75' did also): [img]http://home.ama-cycle.org/membersonly/museum/images/b98/RokonBike_600.jpg[/img]
82' KX125:


76' Rokon had front and rear brakes (I think the 75' did also):

JOHN CHOATE wrote:
I remember Don "the Killer" Kuldalski racing one of those(Rokon). Thanks for the picture.
Yep I remember that also JC. I remember him doing one hand wheelies in practice at Hyatt or Hollywood Speedway. In 1976 that was big stuff.Smile

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