ATC200X hubs same as 300EX, 400EX?

[unclejemima]

Are they same same spline count? Bolt patterns? Will they interchange?
Thanks,

[dcreel]

Yes, yes, and yes. They will add about 1 1/2 - 2 inches more width too.

[Stonecoldchavez]

Yes, I have 400ex hubs on my 200x.

[Jason Hall]

04-10 TRX450r hubs are the same spline also.