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I run the 700x65 on my 29er. I like them though they're relatively short (need flaps) and do sometimes bump around.
60mm 20 inchers sound GREAT though (and look very affordable) for the future minivelo build. Though apparently the VO minivelo can fit Clearance for 2.3" tires WITH fenders, implying I would need 20inch 65mm ones.
Definitely going to be cheaper than the VO metal 20 inchers though.
I have some in both 60mm and 65mm. I think the newest addition is 700x60 and 700x65.
I bought my first set of 26x60 more than three years ago.