i know this has been discussed on here before but i didnt find the thread. i have a 10 yz450f. im lookin for a spare rear wheel. i know in 09 they switched to a different size axle. can i purchase a wheel from before 09 and just get the new spacers? or is the wheight to great to support on the spacers. and if thats the case, do the new bearings fit in an older hub?