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How critical is matching tube diameter with tire width ?

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How critical is matching tube diameter with tire width ?

Old 03-14-20, 04:18 PM
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Brocephus
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How critical is matching tube diameter with tire width ?

I'm looking at picking up some spare 29er tubes for the 1.6" tires I'm running (on kind of an urban commuter hardtail faux-mtn bike), and everything I'm considering is advertised as being compatible with tire widths ranging on the narrow end at 1.75" or 1.9" , with a max width ranging from 2.2" up to 2.5". Can I run any of these inside my 1.6" tires, or do i need to be hunting down some tubes with closer dimensions? Or, is this a non-issue and close enough is close enough ??
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Old 03-14-20, 04:34 PM
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Close enough
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Old 03-14-20, 04:39 PM
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1.6" is about 40mm.
Look under 700c tubes instead of 29's. (same thing) you'd want something in a 622 dia. by 35-40ish mm.
I like my tubes to "stretch" just a little bit when inflating.
Oversize risks getting folds in the tube.
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Old 03-15-20, 08:10 AM
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Anybody else ? So far I've got one Yea and one Nay, which doesn't exactly give me a consensus of opinion .
The 700's I'm finding don't get up into the width range I'm needing, and the 29ers all seem to run a little too wide.
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Old 03-15-20, 09:36 AM
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So you'll be stuffing wide tubes inside narrow tires? If it doesn't get too bunched up and pinched, it will probably be OK.
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Old 03-15-20, 09:50 AM
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I'm sure there are plenty of people that get away with putting big tubes in smaller tires. I wouldn't do it except as a measure to "get by" until I could get something better.

If the tube is too big at the get-go, then there will likely be some irregularities in the way the contact patch behaves as your tire travels over the road. You may or may not perceive this depending on how sensitive you are to such and how bumpy the road surface is itself. On the more extreme end, you might see bulges and depressions in the tire surface that may indicate wrinkling and kinking of the tube inside.

I'd err on the side of smaller tubes instead. However the smaller they are, I'd think the more they'll be prone to failure when something stick in them but doesn't completely puncture them.
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Old 03-15-20, 10:04 AM
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Use the 700x 32-47mm tubes.
https://www.universalcycles.com/shop...8&category=199
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Old 03-15-20, 11:01 AM
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Originally Posted by trailangel View Post
Thanks, those look about ideal. I had been shopping at UK vendors like Merlin and Chain Reaction (where my currently missing stash of tubes all came from), because they tend to be so much cheaper than US vendors, but it looks like Performance and Nashbar have these for $6, w/ $1.99 shipping. I might save a few pennies buying from the UK, but it ain't worth the shipping delay, especially with current events possibly adding to it.
Another plus with this size tube is that they can do double duty on my road bike, which is currently running some big, fluffy Continental 32mm tires. Thanks again to all for chiming in.
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