The rear bearing size depends on your stub axle size there a to sizes most older karts have a 6202 with the 15mm axle and Most 2008 come standard with 17mm stub axles bearings and use a 6203. The performance stainless bearings available at blokart last time I check were both marked 6202 as they are custom designed and neither fit the design specs for a 6202 or a 6203. The main reason the bearings a better from blokart is they come with no grease so you save time cleaning all that grease out and also the bearing tolerances have been changed to make them spin better.
Cheers
Richard
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