Bicycle Mechanics - Fit a 20" tube in a 19" tire?
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.
07-23-08, 12:06 PM
I'm currently restoring an old Solex 3800 (a motor-powered bicycle) that has a strange wheel size- 19". Will a standard 20" (BMX) tube fit in this wheel? Here is a pic of the bike-
07-23-08, 01:06 PM
I think it might. Assuming the pressure is low, just be extra careful not to have a kink in the tube.
The cost will be low, so it's worth a try anyway.
07-23-08, 01:21 PM
The difference in diameters of so-called 19" or 20" tires is not necessarily 1". See these charts for actual diameters of the bead-seat diameter (BSD) of the various tire standards: http://sheldonbrown.com/tire-sizing.html
I don't see anything listed as 19" specifically. I would estimate the 19" wheel's BSD and see how it compares to a 20" BMX wheel (406mm I believe).
The only tubes I've seen that are compatible with two different standards are ones for 700c (622mm) and 27" (630mm).
That all being said, if it fits, I guess it fits.
You should be able to use a 20" tube. I once found a tube inside a 27X1-1/8 tire that was about 6 inches longer than a standard tube. it had a 3" section that was folded over itself, and I never knew about it until I changed the tire. i don't know where that tube came from. I also heard of a guy who drilled a second valve hole in his rim and put 2 tubes in the same tire. If he had a flat, he just pumped up the other tube. I never actually saw that, but I think it would work.
Try stopping by a place that sells scooters or mopeds. I bet they have 19" tubes.
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.