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2/1/2019
Location
Ijamsville, MD, USA
anybody switched to a 120 rear tire from a 110? Pros cons? I struggle around flat turns it seems. On a 450 and every kind of dirt from loam to hard pack where I am. Brand to brand actual size seems to vary, based on a little research. I bounce back and forth from mx34 and Michelin starcross
Running 110 on my 450 with good results. The Bridgestones and Pirelli’s seem to run a touch bigger (true to size) compared to the MX34 rear. Not sure on Michelin sizing; haven’t purchased any since the Starcross 5 days
As above says, cant go by just tire dimension unless looking for a more narrow or wider tire from the same manufacturer and same tire series.
110 bridgestone is like a 120 Michelin. Or has been at least before.
If you like the current power delivery try a 120/90 instead of the 120/80 as another option.
You'll have to try them to see what you like.
110/90-19 is a little taller with more squared profile, easier to tip in to a corner, more cushion on chop.
120/80-19 is a little lower and more round profile, larger contact patch for braking and accelerating while leaned over
120/90-19 slightly taller squared profile, wider tread area, most cushion on chop, wider contact patch for up right accel and braking.
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For desert riding I liked 120 (lots of straight line), for anything technical & turn-y, I like 110 on 450Fs, 100s on 250Fs.
Totally true that the brands vary wildly in width for the same claimed "120mm" or "110mm" ---> Experiment, experiment, experiment ---> It's the only way I know of.
I tend to agree with Rider 5280, although I’m on the 350 wagon and have been for a while. I feel like I can lay the bike over faster and stay on the side knobs better on a 110 which is pretty important on the flat corners you mentioned. The 120 is a little more difficult to lean over and wants to stay upright. The 120 definitely has more straight line grip, both in acceleration and braking. I’m in the mountain west and don’t really have a lot of ruts to contend with so usually the tire width doesn’t matter for me in the rut situation. As mentioned already, different brands have different widths so use the same tire for a true comparable test at first, especially if you like the rear that you’re on currently.
I’m just a slow, old guy so I’m chasing comfort not tenths.
Splat03 is spot on. A more narrow rear will turn easier. It has to do with tire patch offset when leaned over.
Not one person mentioned tire pressure
Totally missed that. I know what tires and pressures I ride with in my area, just assumed the OP had those parts already dialed in. Definitely worth being in the discussion.
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