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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
Can I use tubes labeled 27 x 1-1/8" in tires labeled 27 x 1-1/4"?
Any disadvantage? Thanks! Please reply to the list. |
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#2
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
Yeah, tubes are stretchy so they'll work with tires a bit bigger or
smaller than what they're meant for. For example, I used 700C inner tubes on 27" wheels, without any problems. I'd be a little more careful when it comes to width, because if you use a tube meant for a narrow tire with a wide tire, that means the material in the tube will be stretched out thinner. That can lead to slow leaks and make your tubes more puncture prone. All that being said, I'm using "26 mm max" tubes with "28 mm tires", and it works fine... The difference between 1-1/8" and 1-1/4" is about 3 mm. Dan |
#3
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
OughtFour wrote:
Can I use tubes labeled 27 x 1-1/8" in tires labeled 27 x 1-1/4"? Any disadvantage? They will work, but the disadvantage is that since they are stretched more, air will be "breathe" through them more easily, requiring more frequent topping off. There's also a slightly greater risk of puncture. Art Harris |
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
On 8 Jul 2005 12:09:16 -0700, "Art Harris"
wrote: OughtFour wrote: Can I use tubes labeled 27 x 1-1/8" in tires labeled 27 x 1-1/4"? Any disadvantage? They will work, but the disadvantage is that since they are stretched more, air will be "breathe" through them more easily, requiring more frequent topping off. There's also a slightly greater risk of puncture. Art Harris Dear Art, The increase in air loss and puncture risk would be slight indeed. Assuming that the tubes were indeed designed for different sizes (and were not merely the same sizes with different labels), the tube would stretch 11.1% in one dimension and thin that much. (For idealized round sections, the figures are 3.5343" circumference, versus 3.9270".) So the already small air loss rate might increase 11%. If the rider topped the tires up every 10 days, he might have to start topping them up every 9 days. As for punctures, only near punctures involving debris that penetrated 89% to 99.9% of the tube wall would become successful due to the slightly thinner tube wall. But the number of near-punctures that penetrate more than 90% of the normal tube are vanishingly small. To understand the typical range of pointy objects, consider the thick outer wall of a typical "thorn resistant" tube--it's 0.115" thick, almost 4 times the thickness of an ordinary 0.030" tube. Imagine trying to stick a needle 9/10ths of the way through a tube only 0.030" thick--the margin of error would be only three thousandths of an inch, about a sheet of paper or so. Carl Fogel |
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
On Fri, 08 Jul 2005 18:44:05 GMT, "OughtFour"
wrote: Can I use tubes labeled 27 x 1-1/8" in tires labeled 27 x 1-1/4"? Yes. Any disadvantage? No. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
On Sat, 9 Jul 2005 02:31:56 +0100, "Pete Biggs"
wrote: wrote: As for punctures, only near punctures involving debris that penetrated 89% to 99.9% of the tube wall would become successful due to the slightly thinner tube wall. It's not just normal punctures that you have to worry about. I've had more problems with holes and splits* eventually developing in thin and narrow tubes than thicker and wider ones (in the same tyres). * Not caused by external objects penetrating, but by roughness/cuts inside tyre or rim tape. ~PB Dear Peter, While I can't say that I've had such internal problems on my touring bike, it seems odd that a theoretical 11% stretching in one dimension of a 1&-1/8th inch inner tube to 1&1/4 inch would have much effect on internal problems. That is, if a rider somehow wears a hole in the stretched inner tube in 100 weeks of riding, then it seems likely that an unstretched tube would have lasted only 10-12 more weeks more. I'm not sure how long "eventually" is for unpunctured tires to develop holes and splits, so the 100-week example may be wildly off. Carl Fogel |
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
A week ago, I would be all for using the skinnier tubes. Then I got my new
wheels and was putting on a set of 28mm tires, and tried using 23mm tubes, 'cause that's what I had lying around. The first one blew out at 95psi. I thought i'd pinched it when seating the bead and tried again. I put on another one, and it only made it up to 80psi. I then noticed just how tiny the tube was compared to the tire. I went and bought some 32mm hybrid tubes and had no problems, other than a now wildly out-of-true wheel that hadn't even been between my droputs yet. Ah, well. I could use the truing practice. Honestly, I'm surprised my neighbors didn't call the cops. They probably thought I had a meth lab that blew up. Twice. -HW |
#10
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27 x 1-1/8 tubes OK for 27 x 1-1/4 tires?
Hank Wirtz writes:
A week ago, I would be all for using the skinnier tubes. Then I got my new wheels and was putting on a set of 28mm tires, and tried using 23mm tubes, 'cause that's what I had lying around. The first one blew out at 95psi. I thought I'd pinched it when seating the bead and tried again. I put on another one, and it only made it up to 80psi. I then noticed just how tiny the tube was compared to the tire. I went and bought some 32mm hybrid tubes and had no problems, other than a now wildly out-of-true wheel that hadn't even been between my dropouts yet. You have some other problem, small cross section tubes do not cause blowouts, especially ones that make noise. Your tire came off the rim and would do so with any size tube that you mounted the way you did. Ah, well. I could use the truing practice. Don't look there fore an excuse, the tire was not on the rim. Honestly, I'm surprised my neighbors didn't call the cops. They probably thought I had a meth lab that blew up. Twice. You'd better have another look at how you mounted the tire and consider an FAQ item that addresses that subject: http://www.sheldonbrown.com/brandt/blowouts.html Jobst Brandt |
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