Mark, the recommended thread only describes the issues with the bolts and the odd assembly... What I need is someone telling me - yes, buy these, there si a massive difference to your axial ones or don't bother, there is no difference.. After all, the glossy black radial caliper is the same size as mine axial matt black (both four pots). Is the yellow one on 620R any bigger?? What about that grooved brake disc? Is that still 10inch?