120 tire effect Bike Geometry

[RMK800]

Hi,

So I have been running a 120 tire on my wr450 and what I have noticed is that it corners great but the back tire seems twitchy or spinning out a little to easy.

So I was reading about suspensions setup etc and was thinking. If the tire is taller should I be moving my forks down? Is this an adjustment that should be made when going to a bigger tire then stock?

I'm thinking if I raise the forks slightly I can get a little more bite and stability out of that back tire

And hopefully keep some of that turning.

I have set my a static and race sag and done a few things with compression and rebound on the rear.. It's better but still room for improvement and this might be an easy way.

[FORMA MOTO]

Just because it's a 120 doesn't mean it's taller.

You have to check the tire co's website to confirm tire diameter.

And yes it will absolutely change your steering geometry. I used to run the Dunlops cause they were always taller, making my Honda turn better.

Heck, just going from 4 ply to 6 ply in the rear will make it turn better, but get less rear traction. A common desert riders problem.

[RMK800]

Good info thanks.. I don't know what the stock brand is for this 2007 bike, but a 120 to a 110 seems to be around .60 taller in the brands I have compared them to.

[FORMA MOTO]

The tire ratios and carcas numbers are not including the knobs.

So, if it's a Kenda Washougal, it's taller than a Dunlop MX71 of the same size, cause the Kenda has huge tall knobs.

The only way to know is the read or measure the actual.

Edited September 4, 2013 by Krannie