Bicycle Mechanics - are there different 20" tire sizes?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.




steveknight
02-23-05, 08:48 PM
I bought these on eBay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7132897697
I did not think I would get them for my minimum big. I asked the seller what PSI they went to and he said 100. Though they only go to 85 psi.
Well I get them today and decided to change the tire I had on my bent. I just bought a new front wheel with a velocity 20” bmx deep v rim. Well the tire that came with it has always been very hard to remove. On the new rim I could not get it off. So I said I have two tires here so I just cut the wire bead and removed it. well only to find when I went to put the tire on it is way too large. It is about the same size as the outside diameter of the tire I just removed. But it does say 20 1 3/8 on it. So what gives? Are there different 20” tires? Should I see about getting a refund?


Retro Grouch
02-23-05, 08:53 PM
Fractional tires (20 x 1 3/8) and decimal tires (20 x 1.5) have different bead diameters. Sorry.

steveknight
02-23-05, 09:11 PM
Fractional tires (20 x 1 3/8) and decimal tires (20 x 1.5) have different bead diameters. Sorry.

I see. well learn something new each day. s oI take it I won't find a smaller tire then 1.5 in 20"


DocF
02-24-05, 04:35 AM
Bike Tools, Etyc. offers an IRC Metro Slick in 20 x 1.25".

20" tires (http://www.biketoolsetc.com/index.cgi?id=644122864&c=Tire%20Tube&sc=Tires&tc=20)

Doc

steveknight
02-24-05, 09:12 AM
thanks for showing me. looks good but for it only going to 85 psi. so t goet to 100 I may be limited.

ofofhy
02-24-05, 09:30 AM
thanks for showing me. looks good but for it only going to 85 psi. so t goet to 100 I may be limited.


FYI: http://sheldonbrown.com/tire-sizing.html

frozin
02-24-05, 01:52 PM
hey, primo comet tires also come in decimal sizes and are availble in many different sizes. they are rated for 85 psi, but you can pump them up more if you want, it's no big deal. i rode a 20x1.75 comet for months with 110 psi riding ramps and only flatted a couple times, nothing unusual.

steveknight
02-24-05, 11:17 PM
FYI: http://sheldonbrown.com/tire-sizing.html

I always forget about his site. well now K nwo whats going on and what i can get.