Quasi-moto is about 700mm (spec is 699 +/- 5mm), and the only 2.0 650b available now. Other tires are 2.2 and 2.3 and about 2 - 5mm greater in diameter.
We who have very minimal clearance have found the Quasi and Neo casings stretch in diameter with higher pressures and stretches further over the life of the tire, up to 4mm tighter in clearance overall.
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