Front and rear sprockets for Yamaha YZ85, YZ125, YZ250, YZ250F, YZ450F, WR250F and WR450F, from JT, Renthal, ProTaper and SPP, listed by model and year.
The YZ125 through YZ450F and the WRs all run a 520 chain, so a 520 rear listed for the YZ hub fits across the range for its years. The YZ85 runs a 428 and the YZ65 a 420.
Change the sprockets and chain together: a worn chain on a new sprocket eats it in a few rides. Going one tooth bigger on the rear gives more bottom end for tight tracks, one tooth smaller on the front does the same with less cost. Members pay the member price on every product in the store and get free standard shipping on orders over $10. Membership is $5 for the first month.
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The YZ125 through YZ450F and the WRs all run a 520 chain, so a 520 rear listed for the YZ hub fits across the range for its years. The YZ85 runs a 428 and the YZ65 a 420. The tooth count you choose is up to your gearing; the stock counts are on the listing and in your bike's manual.
Steel lasts two to three times longer and costs less; alloy is lighter and comes in colours. For a bike that gets washed and ridden every weekend, steel. Race day only, alloy.
When the teeth start to hook or the chain will not stay tight. Replace chain and both sprockets together and they will all last; new on old wears the new part out fast.
Members pay the member price shown on every sprocket, 15 percent or more under RRP, and get free standard shipping on orders over $10. Membership is $5 for the first month.
Not sure what fits? Set your bike at the top of the store and every list narrows to parts with confirmed fitment, or message us with your model and year.
