Advantage/Disadvanage of a 120 rear tire?

[klogeman]

Just bought a 2009 YZ450F and need some new tires. What size is everyone running for rear tires? What makes one size better than the other? Turning ability? Traction? I ride MX with the occasional trail ride on some pretty rocky ground.

[grayracer513]

I run a 110/90x19. I don't like the heavy feel of the 120, or the fact that it encourages the front to push.

[hackman162]

I second gray's opinion. 110/90-19 for me too.

[heaththemoose440]

i ran a 120 on my 250x and it was good for trail riding. but i got 110s on my 450 and its comfortable everywhere

[DrNation86]

The 110/90/19 is what i run on my 04 yz450f the 120 lessens the grip in ruts from other riders and make the bike push high in corners in my opinion.

[cowboyona426]

How about up front fellas... 80/100/21 vs 90/100/21?

[grayracer513]

I am ordering a Bridgestone 201 in 90/100x21 on the recommendation of a fellow desert racer. Application will be SoCal desert soils, which range from blow sand to hard pack alkali DG to rocks. I've tried a number of other tires and not been really thrilled with any of them. Currently using a Dunlop 952 in 80/100x21. I'll post in a new thread once I get enough time on the tire to evaluate it.

[WYO522]

If your stricly gonna race the bike then 110 is best, but if you are gonna do any kinda trail riding, climbing, or desert racing 120 is a better choice. I have found that most 120 tires have bigger lugs and deeper tread then smaller 110's. Just some food for thought.