08 Rear Tire Size, 120/80 vs 110/90


7 replies to this topic
  • Kaw_04_250f

Posted March 03, 2012 - 03:57 AM

#1

I am sure there are many topics on this but I can't get the search function to work. So I have an 08 that is in need of a rear tire, it has the 120/80-19 on it and I was wondering if there were any advantages / disadvantages with going back to the 110/90-19 the 07 had. Does the different aspect ratio change the handling of the bike since it changes the attitude?

Thanks

  • crf450319

Posted March 03, 2012 - 06:19 AM

#2

Hey,

The wider footprint of the 120/80 is supposed to make turn in slower than a 110/90, I've run both on my '09 and didn't really notice a difference. But at the same time, I wasn't trying to "test" how the different tire sizes felt/handled. I have switched back to the 110/90's though.

Something else to consider is weight, I've never weighed both tires back to back but I've read that the 120's are heavier. If the difference was significant enough, it could have a negative impact on handling for sure.

  • grayracer513

Posted March 03, 2012 - 10:04 AM

#3

It all depends on the individual tire. The size is supposed to indicate the width of the tire body (120 or 110mm) and that the body of the tire is either 80 or 90% as tall above the bead as it is wide. The trouble is that the standard doesn't specify whether the width measurement is taken from inside or outside, there's no rule at all about the shape of the cross section, and none of this tells you anything that relates directly to the tread. The result is that some of one size are more or less identical to some of the other size, and really, they're more or less interchangeable.

I prefer the 110/90, though.

  • YamaLink

Posted March 05, 2012 - 01:15 PM

#4

If it's a rutty track or course, or muddy, I prefer the 110.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • tpars121

Posted March 05, 2012 - 02:12 PM

#5

From the Motocross Action magazine review:

(4) Rear tire: Yamaha went to a 120/80-19 rear tire. Most MXA test riders prefer the 110/90-19 because it is quicker in roll and has less tendency to push on the entrance of turns (something Yamaha should be concerned about). Why did Yamaha make the change? The wider 120/80 is 300 grams lighter

http://motocrossacti...Z450F-4179.aspx

  • poppa

Posted March 05, 2012 - 03:49 PM

#6

From the Motocross Action magazine review:

(4) Rear tire: Yamaha went to a 120/80-19 rear tire. Most MXA test riders prefer the 110/90-19 because it is quicker in roll and has less tendency to push on the entrance of turns (something Yamaha should be concerned about). Why did Yamaha make the change? The wider 120/80 is 300 grams lighter

http://motocrossacti...Z450F-4179.aspx and at least .03 pesos less expensive.



  • Kaw_04_250f

Posted March 05, 2012 - 06:11 PM

#7

Thanks for the help guys, I think I will give the 110/90 a try. If it slows me down I will just use the excuse that my new tire is 300 grams heavier than my old ...... :bonk:

  • VetRacer75

Posted March 06, 2012 - 02:21 AM

#8

Personally i prefer the 120/80 over the 110/90.
It seems to give me a fraction more traction on race starts and out of corners, and i seem to get slightly more wear time out of it aswell.
I didn't realy notice any handling differences apart from traction, seemed to turn the same, and i dont know why but i can run a slightly lower pressure 10.5psi whereas the 110/90 seemed to hook up better with 11.5psi.
Just my opinion.
Cheers.





Related Content

 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.