The 2013-2015 450R and 2014-2015 CRF 250R has a new rear wheel hub design that is 3.8mm offset to the left side of the bike to reduce problems with the chain rubbing on the tire and mud flap. This prevents earlier wheels from being used as the chain goes out of alignment enough to throw the chain. The RCW Products spacer kit allows 2004-2012 wheels to be used.
1 - 3.8mm Aluminum spacer
6 - FUGI-LOCK Sprocket bolts that are 3.8mm longer than the stock bolts for proper fit and clearance.
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