250r a-arms on a 400ex?

[Foxrage]

Will it work? Thanks

[crashinmatt]

from what i understand, 400ex and 250r a arms will both work on a 300ex (for those guys that convert to them and shocks). so, i would think they would work, but im not sure if the length is exactly the same.

[cdalejef]

The frame mounting points on the 250R arms are narrower than the 400 and 300. Spindle offset is 4 degrees different too.

[Foxrage]

So there is no way these will fit? I bought a front end package deal for a good price, but it was for a 250r.

[cdalejef]

The 250R arms will work on a 400ex if you use shims on each side of all the bushings. If the arms that you bought are +1 foreward, you may find that the tierods hit the shocks springs on full turn.

[Foxrage]

I beleive they are just +3 a-arms. I guess i will find out....Will washers work? Thanks

[cdalejef]

Yes, they should.

[forum]

no . you got it the wrong way around. 250r is wider. If you were to use 400ex arms on a 250r. you have to use spacers or washers. If your using 250r on 400ex you may have to grind the ends down. Im positive of this because i had to grind down my roll's that i took of my R when i put them on my 400. I am 100% on this.

[cdalejef]

Sorry, my fault....it just came out backwards.

[forum]

Yea thats what i figured. I didn't think you'd be wrong. But it just means this guys got more work then he thinks.

[Foxrage]

What all did you have to do to grind it down take out all the bushings and stuff? In the end does it work? Thanks

[forum]

you need to grind down the arm and the inner bushings. and you should still use the plastic washers. Yes it'll work if done right.