400ex a arms and spindles

[sycoracer911]

will the 400ex a arms fit the 250r frame?

[CFM Performance]

No

[xlr810]

Sure, they will physically fit in there. Need to use spacers, though. The 250R has slightly wider mounting points at the pivots than the 400ex. Same shocks will still bolt in, geometry remains the same-- but the 400ex arms aren't as strong as 250R. (stock vs. stock)