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Training/spare wheel's XT hubs are centre lock.
Thinking aloud:
I was hoping to drop the spoke count down to at least 28, of which the only Shimano option without a weird lacing would mean the CX75. Which are double the price of XT, weigh the same and have the same seals.
I suspect the best route would be to forget the weight of 4 additional spokes per wheel, stick to the XT hubs and use some lighter crabon rims.
Jon.-
forget the weight of 4 additional spokes per wheel
This will be negligible when youre using heavy shimano hubs. I can't think of a situation where 28H could ever be the best option. If you want a light/aero race wheelset you'll be using 20/24H, if youre commuting on training 28H will just be weaker with no noticeable benefits. Aero and weight between 28 and 32H is minimal but strength and stiffness suffers with 28H
Turkish
Six bolt?