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19-26 tubes in a 28 tire, is this ok?

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19-26 tubes in a 28 tire, is this ok?

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Old 10-15-06, 06:07 PM
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SD_Joe
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19-26 tubes in a 28 tire, is this ok?

I'm currently using 19-26 tubes in 700x28 tires on my tandem. Anyone have good or bad experience with this? The tires are Continental Ultra Gatorskins and the tubes are Performance brand.
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Old 10-15-06, 06:24 PM
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why push your luck? fork over the 5 dollars for a new tube. to take up the extra room, the tire has to expand that much more past what it normally has to. that can never be a good thing.
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Old 10-15-06, 06:24 PM
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This is sure to get flames:

No problem, that's what you should use.
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Old 10-15-06, 07:06 PM
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Depends upon the quality of the tube. Cheap tube, less likely.

I've been running what were marked as nominally as 23-25's in 28s for a couple years without problems. When I flatted out a 32 on a ride I discovered I had packed the same 23-25 as a spare. Rode it home 20+ miles, sat around for a week or so till I had time to change it.
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Old 10-15-06, 07:12 PM
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I've had 28-32s in 35 tires before and it was bad. Even when pumping the tubes to recommended pressure, the ride was squishy and the tubes wore out quickly.
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Old 10-16-06, 01:58 AM
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I use 23mm tubes with my 28mm tyres... always have... works fine.
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Old 10-16-06, 03:30 AM
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I actually used 23 tubes in 38 tires for a while and it was fine. Maybe they lost pressure a bit faster, but I didn't notice anything.
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Old 10-16-06, 08:35 AM
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Smaller tubes are lighter so you will have more reponsive handling, but when you get a puncture they will lose their air a few milliseconds faster. The choice is yours, but it doesnt make much difference, either way.
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Old 10-16-06, 11:09 AM
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For what it's worth, i've been running a 19-23 tube in a 25mm rear tire. It's fine so far.
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Old 10-16-06, 05:28 PM
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I've run 23-25 tubes in 32c Paselas and Vittoria Randonneurs, nary an issue. I agree it's not ideal, because a tear or puncture will likely propagate more quickly due to greater tube tension at a given pressure.
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Old 10-16-06, 07:37 PM
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Let's set aside the fact that tire sizes are notoriously elastic, shall we say? Let's set aside the possibility that the OP's 28mm tire is quite likely not 28mm, perhaps smaller, perhaps larger. I admit I have no empirical evidence to support this, but I cannot imagine that any additional stretching of the tube from the size of a 26mm tire is so great that the rubber becomes that significantly thinner and more prone to flatting. I can't imagine the expansion from 26 to 28 is all that great.

Ever inflate a tube when it's not encased in the tire? It grows ENORMOUS! A 700x19/26 tube should work just fine in the 28mm tire.
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Old 10-17-06, 12:44 PM
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Originally Posted by lrzipris
I can't imagine the expansion from 26 to 28 is all that great.

It's like over 7%, man. A ticking time bomb, ready to explode !!

Yeah, one need only inflate the tube outside the tire to get a good feel for how much they really can expand.

Had a set on downhill tubes I put inside some Schwalbe Super Motos. Things were heavier then most tires.
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Old 10-17-06, 03:55 PM
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There is a significant number of bmxers who use 16" or 18" tubes in their tires to save weight with nary a problem. The seams on the tubes CAN wear out over time, but 26c tubes in a 28c tire is hardly any difference at all.

You'll be fine.
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Old 10-17-06, 03:59 PM
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You'll be fine. Many MTB'ers that ride on the new 29" wheels use the old 26" tubes just fine.
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Old 10-17-06, 06:03 PM
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Originally Posted by AndrewP
Smaller tubes are lighter so you will have more reponsive handling, but when you get a puncture they will lose their air a few milliseconds faster. The choice is yours, but it doesnt make much difference, either way.
You're claiming that can notice handling differences from a tube that is 2mm undersized?

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