2008 YZ450F Gearing

5 replies to this topic
  • ewilly

Posted September 11, 2008 - 08:24 AM


I intend to use this bike for very tight and technical ST and am thinking I will try going down one size one front sprocket.

Any recommendations from experience if that is enough? I will be going on first ride with it Saturday since buying it used and plan to change sprocket tomorrow.


  • Wiz636

Posted September 11, 2008 - 09:47 AM


Dropping to a 12 up front is quite a change...roughly equivalent to running a 53 on the rear. I would try it with the stock 13/49 gearing frst.

OTOH a front sprocket is relatively cheap if you try it and don't like it.

  • grayracer513

Posted September 11, 2008 - 10:30 AM


12 is pretty small, and sprockets that size tend to wear both themselves and the chain faster.

If you're not sure you'll like the gearing, use a 52 or so from JT or Sunline. You should be able to pick one up for under $40.

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  • ewilly

Posted September 11, 2008 - 11:53 AM


I agree - I think I will try a 51 on the rear and see how that is!


  • OUCR250R

Posted September 29, 2008 - 04:59 AM


My brother ran a 12t on his 01 426 this year during our annual Taylor Park/ Crested Butte Colorado ride. We do lots of technical singletrack and he absolutely loved it. I believe he was also running a 51t rear. It would pull stumps out of the ground and would tractor up any trail we went on. For the $15-20 it will cost you, I'd recommend it.

  • ewilly

Posted September 29, 2008 - 08:40 AM


Thanks, A friend had a 52 which I put on and the heavier flywheel at the same time and I was quite pleased with it. It worked much better on ST and still had enough topspeed to run 5th gear in washes and keep up!!

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