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gbj_tester
Is the reason for using the M525 step-down axle + SPNK M10 seats, a strength-related one
(i.e., 10mm axle = stronger, stiffer, and more meat left after tapping for screw compared to an M9)?
Just for refs, had no problem so far (two rough J2/1 10s, plus IP & 750mTT at my club track champs) using the M9 HED track axle kit (correct seat/cone nut size so no need for spacers), with a cheap M9 QR axle, tapped, and countersunk screws/washers.
Going down the M10 step-down route seems like a bit of a faff.
(But I weigh 72kg, so might not need the extra axle meat)