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General Category >> Technical >> Tire / Tube Puzzle
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Message started by Patti on Sep 30^th, 2011, 2:41pm

Title: Tire / Tube Puzzle
Post by Patti on Sep 30^th, 2011, 2:41pm

I bought new Durano tires for my Cat (28 406) and bought the recommended size tube (20x 1 1/8) to go with them. The tubes are very difficult to use as they seem so much bigger than the rim. No matter how I try to put them on, they seem to crimp badly inside the tire at multiple points. I guess they are supposed to be like this but my original tire/tube combination seemed a lot closer to the same size and were much easier to work with. These are a lot like trying to stuff a live octopus into a jar.
Any thoughts?

Title: Re: Tire / Tube Puzzle
Post by diannalightning on Sep 30^th, 2011, 4:11pm

Patti, it's been my experience that if the tube size is 1/8, 1/2, etc, that it is a 451. If the tube size is 1.25, 1.5, etc, then it's a 406. If that's what happen to you, then the tube (20 x 1/8 will have a larger diameter than the tube that is 20 x 1.25. On the good side, if you want to sell the tubes, let me know. My Mantis has 451 tires.

Title: Re: Tire / Tube Puzzle
Post by Bud_Bent on Sep 30^th, 2011, 7:14pm

Dianna is right. 406mm = 15.98 inches, while 451mm = 17.76 inches, so what you bought is an almost 2 inch bigger diameter. Most tires and tubes will also have the millimeter designation written on them, and that's the dimension you need to know when you buy.

The two different 26 inch sizes, 559mm and 571mm, are close enough that the tubes are pretty much interchangeable, but not so for the two different 20 inch tubes.

Title: Re: Tire / Tube Puzzle
Post by Patti on Oct 1^st, 2011, 7:51am

Arrrg. Oh well, live and learn. Looks like I'll be off to find new tubes today at my least favorite bike shop. Thanks!!!

Dianna, I bought 4 so let me check and see if they will fit the front wheel on my bike. If so, I'll keep one as a spare and let you have the other three.