The stock bearing for my bike was too small to fit in the devol trans arm. There was too much play and water would easily get in there to ruin the bearings. It DOES NOT FIT on a 2007 yz250f. I was even told by DEVOL to buy a stock inner bearing cause the one I had was wrong but it still didn’t fit. So now I’ve wasted even more money and can’t get it back.
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This helped the handling on my 2014 and 2016 yz 450.
I put it on my 2014 YZ 250f. Amazing difference. I'm running the 4th setting. Brought the rear end down a little and made a huge change in cornering. Bike tracks out perfect on the flat corners and also holds its line easier. I race B class. I cant believe I haven't used one before this bike.
Installed it on my YZ450, I can use three of the five positions, four and five put the shock spring into the swing arm.