I'm not a machinist but it seems to me you could also increase the size of the hole in the hub by 1/16th. I'd rather put a hub in my lathe than a spindle.
To use the original inner bearings for the P30 the OD needs to go up to 3", I think about .109" jump. Might not be enough meat in the hub?
Other concern is the hub is also the rotor, the rotor is not separately replaceable. I don't like the design but this hub/rotor seems close to working dimension wise.
If the hub gets bored out to fit larger bearing it'll have to be done for every replacement rotor/hub. But for my use that may never happen, some how I can't seem to wear out brakes...
As far as chucking a 12.5" rotor or the spindle to modify, either is fine with me.
Grigg
