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onyerbike-
The M525A doesn't have the nice big rubber outer seals like the M525. Think the 'A' is a cheapo OEM spec one.
If you don't mind 36h, last time I bought one an M525 they were £8 at SJS cycles (exc. postage)
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Offer is still on: https://goo.gl/UaD7sWEDIT: so is this for a front hub rather than a converted fixed rear? That axle won't work as the cone nuts in the two shimano hubs are M10x1 threaded.
Lukas
Shimano M525 or M755, and Velosolo