Originally Posted by
casey86
Something I found today that I forgot I had was this 20" mountain bike tire. Since the wheels on this bike are 20" I assume it would fit it right? I was thinking of maybe taking off the back wheel (since that is the area that will have the most weight on it on March 28th) and putting this Schwinn tire on it because I assume this Schwinn tire is 10x better than the generic tire on the bike. Its a mountain bike tire but also says for on road use too. Would it put the bike off balance if I put this tire on the back?
MAYBE. There are two currently common rim sizes that are called 20" ; 406mm and 451mm. See:
Measuring Bicycle Rims and Hub Flanges Tires for one will not fit the other.
Let's say you have a 47mm wide tire. Per Schwalbe (
http://www.schwalbetires.com/tech_in...ion_pressure); for 250 lbs (114kg) the tire pressure should be about 69˝psi (114-75=39; 1.39 x 50 = 69˝) That is 60% over the rated max, which I would be uncomfortable with. Does your bike have hooked rims? If not, I'd be replacing the rims.
If you have 406 rim/tire; Marathon's HS420 is available in a 47-406 that is rated to 70 psi.
Marathon HS 420 | Schwalbe North America
EDIT: sorry I missed fietsbob's post above - but we are recommending the same tire, IF and ONLY IF you have a 406 rim.