61cm-67cm. Most comfortable on my Panasonic 66x59, a nice ride on centuries.

Part of the idea is to give more hand positions for the long ride.

And I have ridden that 16 mile ride home on the bike as pictured. Sometimes with studded tires. Sometimes with a topeak kiddie seat. Sometimes I rode both ways on an extracycle, with a kid on the back for the last seven miles.

Kids are out of daycare now so I don't have to include that in my commute. But I miss it-- it got me in fantastic shape.

I do need a longer seatpost, though-- maybe a 400mm w/ setback.

But really, where else am I to go for a large-enough ride that folds fast for the train? Part of the reason it's wearing Conti T&C 2.1"s is to make the bike ride a little bigger and bulkier than it would on the 1.5" tires that came stock.

I started out bike commuting riding a little 16" Dahon Curve D3 10 miles/day!