Join Date: May 2009
Bikes: 1952 JC Higgins Jet Flow, 1957 AMF Roadmaster Deluxe, 1959 Columbia Firebolt, 1962 Columbia Newsboy Special, 1964 JC Higgins (unkown model), 1968 Juncker Flying Jet promotional bike, 1981 Raleigh fixed gear, 1982 Murray Monterrey (customized), & more
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I care for comfort more than rolling resistance, so on every bike of mine but one I've put on the widest tires that will fit. I don't know about the Robin Hood, but in general you want to check not just for frame clearance, but also chain clearance. The tires might fit in the frame but the chain rubs the side of the tire. This normally won't happen until you start getting into the really wide sizes.
Fender clearance is another potential issue if the bike has fenders. If the fit is too tight the tire might pick up a piece of glass which then rolls against the tire and fender until it punctures the tube. With a bigger gap between tire and fender the momentum might throw the glass out where it just bounces off the fender and falls to the ground. I learned this after cramming a pair of 2.5" tires under a pair of Planet Bike fenders who's maximum recommended tire size was 2.35". I got 3 flats in 1 week with that setup. Each hole was in the exact center if the tire, which is also where it had the least clearance under the fender.
I've got a big enough tire inventory to experiment with a particular tire and frame before making a purchase. If you don't have any tires similar to the ones you want to try, think about asking a friend to borrow a wider set of tires for a day and try them out. Or buy the new tires at a LBS, so if they don't fit you can exchange them for something else in the same day, avoiding the wait and shipping charges you would incur if buying them online only to find out they don't fit.
Last edited by subclavius; 05-22-09 at 10:30 PM.