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does the boostness come from an adaptor
Not in the case of a properly designed boost hub. The point of boost is to extend the distance from the centreline to the rotor side flange to make the spokes more or less symmetrical. In the case of Pro2, the rotor side flange is 20mm off centre for the regular hubs and 25mm for the boost ones. Because the distance from dropout face to rotor face is the same for regular and boost hubs, you'd have to take the whole 10mm off the non-rotor side of the axle to make everything line up.
apologies for my laziness but a few noob hub questions:
1) hope pro 2 front hubs with QR if they are 110, does that mean they are "boost"? does the boostness come from an adaptor (can it be converted to 100 thru axle)?
2) Chris king hubs, converting a rear to QR, or 20mm to 12mm thru axle ... is there a cheap solution?
cheers