Bicycles Stack Exchange
Bicycles Stack Exchange

Questions tagged [innertube]

A rubber torus shaped balloon which is inflated via a valve inside a tyre to keep it rigid.

A rubber torus shaped balloon which is inflated via a valve inside a tyre to keep it rigid. Innertubes are available in a wide variety of sizes and thicknesses. They are being replaced in some cycling circles with Tubeless tyres.

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What powder is used inside an inner tube?

I just cut open an old inner tube I had laying around and noticed there is a white powder in there. What is it? Why is it there?
allyourcode
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Quality check for donated tubes

I receive a lot of donated inner tubes, which may be perfectly good. How can I check them with confidence and be assured of no slow leak, without damaging the tube or taking an extremely long time?
SamA
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Repairing Presta valves

This is the third time that I've had a leaking Presta valve on the tube. There must be a way of repairing the Presta valve rather than having to discard a good tube. Someone did it by applying glue, but I didn't watch closely enough to see where he…
user899
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Inner tubes - if two tubes match the tire, is bigger or smaller better for durability?

Some of the inner tubes tire thickness ranges overlap. For example Schwalbe often offers tubes in 1.5"-2.4" and 2.1"-3.0" width ranges. Given a tire that fits both ranges, like for example a 2.15" tire, is it better to buy a larger or a smaller tube…
Piotr Sarnacki
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I keep breaking the tips off my presta tube stems

I can't pinpoint what I'm doing wrong while inflating my tubes. I use presta valves and have a "Joe Blow" Topeak pump. I put the tube stem at 12 o'clock, I unscrew the tip of the tube stem (but not too hard), press to let out some air, place the…
Mary B
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What is the difference between SV17 and SV19 bicycle tubes?

I know that "SV" is short for "Sclaverand valve" and this page shows a really nice schema for the difference between AV / SV / DV. Especially the diameter of the valve seems to be set by AV / SV /DV. The diameter of the tube as a whole is set by the…
Martin Thoma
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How do I patch a tube's ribbed area?

Normally, when applying a patch to a tube, both the patch and the tube surfaces are smooth and it is easy to press the patch onto the tube. However, some tubes have small ribbed areas where it is hard to get a patch to fully adhere. What do you do…
Zian Choy
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Complete beginner's question: inner tube too big?

My tire wall tells me that my tires are 26 x 1.95. I bought a 26 x 1.75-2.15 inner tube. When I change the inner tube, though, the tube is bigger than the wheel by two inches. How do I determine inner tube size? Or am I just doing this wrong?
Bernard Soubry
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Is it normal for an Inner tube to bulge when inflated?

I recently bought a pair of inner tubes and when I partially inflated one of them before putting it into the tire (only a few pumps with a floor pump), I noticed a portion of it was bulging out considerably. It looked like a snake who had swallowed…
suskie
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Is it ok to use an inner tube that is slightly too large for the tire?

My hybrid bike tire measurement says 700x35c. I ordered a replacement inner tube stating it was 700x35-40c but when it arrived it is actually 700x38-45c. Could I still use this or will it cause a problem, e.g. with my brakes?
Cesky
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27.5x.215 tubes in a 27.5x210 tire. How big of a problem

I wanted to install puncture resistant tubes on my mountain bike. Unfortunately the only size I could find were 27.5×.215 tunes and my tires are 27.5×.210. I got the tubes on, the beads seated and the tires inflated. I took it for a ride and…
Chris
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Why does the manual for the inner tube say the maximum pressure is 4.5 PSI?

I recently picked up a pair of Schwalbe Aerothan inner tubes which are made of plastic and very lightweight. The manual for these tubes indicates that the user should not inflate past 4.5 PSI. Quote: ASSEMBLY INSTRUCTIONS AND INSTRUCTIONS FOR…
User
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Thin tube vs regular

I went to replace the tubes on my bike but realized the tubes I’m replacing say “thin” on them. The tubes I just bought do not. Does it matter? Can I use a regular tube? The sizes match just this one difference. Besides, I just looked for “thin”…
Jason
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At what temperature can you use a "vulcanizing" tube repair kit?

I have a repair kit "REMA TT 02 Tour Patch Kit". It says its glue/cement is "vulcanizing" but I don't know where to find a manual. At what temperature can the glue work? Ex: if the bike is outside and I am fixing it out there.
rogerdpack
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Re-patch with different style of patch kit?

I have an inner tube that I previously patched with one of those sticker patch kits, but the puncture was on a seam, and now the air was leaking out around the edges of the sticker. I want to re-do the patch with a different patch kit, using…
user1521655
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