letsClear this up!

[turnandburn]

I have did searchs so dont even say use the search button. I bought a rpm axle for a 250r and i have a 400ex i have read you need to use 250r hubs but is it due to width issues or is it a spline issue!

[turnandburn]

some one knows the answer!:)

[JOEX]

I'm pretty sure it's the splines, better wait for another more reliable source though:p

[TRX310R Rider]

I know with the Durablue axle it's because of the splines. When I had my 400 I ran a 250R Durablue +2+2 and all I had to was get the hubs with it. It works great too...Later

[QuadRacer041]

its a spline issue, the r has a bigger diamiter axle tube at the splines.

[turnandburn]

thanks guys! and i went to mount it today and the sprocket hub is also different correct?

[250rmike]

yes its the splines i believe one has 20 and one has 21. or some number like that correct me if im wrong. if someone counts the splines on there 400 axle i have a spare r axle lying around i can check

[jonc623]

splines wont line up the r has one more spline than the 400

[pairanutz]

400ex has 24 spline hub
250r has 25 spline hub
the 250r hubs are 1 inch narrower



tb if you need r hubs pm jc623 -he has a set i tried using them to narrow up my 400-but didnt fit tight on my 400 axle

[turnandburn]

thanks nutz bought some on ebay already on the way should have them mon. Do you got any spare parts for a 400 lying aroud i may need some?

[250rmike]

i knew it was some number in the 20's