I have no doubt that you have had the experience you relate. However, you are one individual. And if you ride a lot, you'll probably go through quite a few tubes due to punctures, so you're less likely to be using old tubes. But even with a new inner tube, if it's stretched inside the tire, and you get a piece of glass that just barely reaches the tube, a stretched tube will cut when a tube that's the right size is far less likely to, since there's no stress in the rubber as it's constrained by the tire. Take that tube with the tiny cut in the surface out of the tire and inflate it, and that tiny pin-prick will open.
On Mon, Oct 13, 2008 at 7:00 PM, tarik saleh <[EMAIL PROTECTED]> wrote: > Wow. Ok. I think this is about the biggest overstatements I have seen. > Lucky? Come on. > Let's keep it civil, please. > > > I have run road tubes in cross tires for years and years with no problems. > They get a little thinner sure, nor is it ideal, but really, you can blow > up an unconstrained road tube to 4" in diameter and it won't pop or tear. > The valve is a stress riser, but that is why there is a lot of extra > material there. Michelin tubes are probably some of the nicest tubes > around, as well. Still talced and seamless. > > Buy the right size when you are getting new tubes, but use what you got and > don't worry about it, unless you are running 29erx2.3 tires. Up to 35mm or > so, eh, I don't think it is a "very bad idea". > > Later > > Tarik > > > > > > On Mon, Oct 13, 2008 at 2:50 PM, landotter <[EMAIL PROTECTED]> wrote: > >> >> Lucky indeed. That's why I do the opposite and "size up" on tubes, as >> they run small. The bikes that run 30mm and 32mm tires get "35mm" >> tubes which pretty much don't have to stretch any at all to fit the >> tire carcass. They aren't bunched up in there either. ;-) Utterly >> reliable. >> >> On Oct 13, 9:24 am, Peter Jon White <[EMAIL PROTECTED]> wrote: >> > You've been a bit lucky. It depends on the tube, and it depends on how >> > accurately the tube manufacturer labels the tubes for sizing. Where >> > you run into trouble is at the valve. The valve acts as a stress riser >> > because the rubber at the valve has to stretch more than other parts >> > of the tube. >> > >> > On Oct 13, 7:30 am, bullcitybiker <[EMAIL PROTECTED]> wrote: >> > >> > > Famous wrench Jim Langely recommends using tubes one-size smaller to >> > > make it easier to change a tire. I picked >> > > up his tip a couple of years ago and have had good success: no >> > > increase in flats, and when I do flat, I can change >> > > the tube with no levers. I run 18/23 tubes in my Conti 25s and 28s. >> > >> > > Branson >> > >> > >http://www.jimlangley.net/wrench/flattiretwo.htm >> > >> > > On Oct 12, 6:48 pm, [EMAIL PROTECTED] wrote: >> > >> > > > > It's just a list of other tubes that Michelin makes. Think of it >> as a >> > > > > bit of advertising. It's a very bad idea to use inner tubes >> designed >> > > > > for skinny tires in fat tires. Use those tubes in the tire sizes >> > > > > they're rated for; 18mm to 23mm. >> > >> > > > I agree that it's not a good idea in the long term. But I've found >> that >> > > > carrying one spare which is skinny often makes it easier to change a >> tube >> > > > beside the road, especially in difficult conditions (rain, high >> heat, >> > > > etc.). I seem to be less likely to pinch the tube when it's on the >> small >> > > > side (maybe one size) for the tire. >> > >> > > > Of course you're supposed to swap out the skinny tube for one of the >> right >> > > > size when you've stopped for the night. Something I sometimes even >> > > > remember to do. >> >> > > > -- > Tarik Saleh > tas at tariksaleh dot com > in los alamos, po box 208, 87544 > http://tariksaleh.com > all sorts of bikes blog: http://tsaleh.blogspot.com > > > > -- Peter White --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Bicycle Lifestyle" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/bicyclelifestyle?hl=en -~----------~----~----~----~------~----~------~--~---
