Sheldon Brown has a formula and charts. See http://www.sheldonbrown.com/tire-sizing.html
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I'd like to put the narrowest (with the least tred) tires I can on the bike I have right now using the rims that are already there. How do you determine what that size would be? Is there a formula? a chart? I have already gone down one size narrower and I remember the guy showing me an even narrower tire (I think my response was ...eeeek!....at the time, but I'm ready now) I'm also ready to do this myself.Also, any recommendations on online sites to buy tires from? - I'm just trying to get a little more speed and less friction for now. Shopping for a new bike - don't want to rush the decision. thanks so much.....
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Sheldon Brown has a formula and charts. See http://www.sheldonbrown.com/tire-sizing.html
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72