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The idea behind MTB rims was so with a slightly longer drop caliper (if it was even needed) I could run 26" 28c tyres. 650c rims and tyres appear to be very limited.
I'm having second thoughts about building it at all, I think it would be too big for me to build up with bar extensions as a "proper" TT bike, and the headtube angle seems really slack so might handle wierd with compact drops.
Twin hed 3's is obviously tempting but I had kind of hoped on using this to commute to work on when the weather is nice.
And they would still be the wrong size