Schwinn Suburbans had 1 piece cranks and 27 x 1 1/4 (630 mm) steel rims. Dropout spacing is 120 mm. Brakes were Weinman side pulls, although later models had the DiaCompe clones. Not sure if there is enough brake adjustment for 622 (700C) rims. In any event, I'd recommend going with aluminum rims. Easier pedaling and better braking.

I assembled a lot of Suburbans, Collegiates, Varsities, and Continentals in the 1970's.