Riding on borrowed time? Or, thank you Kenda tubes, for your elasticity.

[LeRoy]

My 59 Clem H came to me second (or third) hand and I was pleased to receive it with Schwalbe Big Apple 50mm tires. It seems to be accepted wisdom that the Kenda tires originally fitted to Clems are not on many people's wish list. After a couple thousand miles in my use, and who knows how many before, the Big Apples were ready for retirement. So last night I fit up a pair of Maxxis Torch 29x2.1" tires (a ride report will follow). To my consternation, I found both wheels equipped with Kenda inner tubes in a 700x35-40 (also marked 27x1-3/8) size. These skinny little tubes looked completely undernourished coming out of the 2-inch wide Schwalbe tires. Fitting them into the even wilder Maxxis tires seemed seriously inadvisable. Fortunately, I had on hand a pair of Panaracer tubes in the 29x1.75-2.35 size. Everything went together in ducky fashion.

With that preamble, here's my question(s): Was I simply a lucky fellow to get a couple thousand completely trouble-free miles from significantly undersized Kenda Tubes in the balloon-profile Schwalbe tires? Or do I owe a debt of gratitude and my thanks to the apparently excellent elasticity of the Kenda tubes? Or is it a bit of each? Seriously, is a size mismatch of this order between tube and tire a serious issue? ...or is there more tolerance than one might expect in "matching" tubes to tires?

Bob, whose tubes were being blown out of proportion, Sharp

[Deacon Patrick]

Inflating a tube outside a tire, it doesn't take much pressure before it is larger than the tire and it is not close to failure. Not luck, and not Kenda tube specific, but tubes in general do that, even Kenda. Grin.

With abandon,

Patrick

[Joseph Tousignant]

Well,...maybe not close to failure,...but not optimum either,......as
the tube DOES get noticeably thinner when it's used much beyond the
stated tire size. A little over and usually no problem,.... but in
your case some luck was involved too I think it fair to say. :-)

On 6/28/20, 'Deacon Patrick' via RBW Owners Bunch

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[Patrick Moore]

This may or may not be relevant to your question and to your needs, but for decades I've been using 559 X1" or 650C ("See") X 23 mm tubes in 32 mm tires and even, at need, in tires up to 60 mm wide, tho' the last only for brief periods in the absence of fatter tubes. But I plan to use the 26X1 tubes in 42 mm Nachez Pass tires once I get around to buying the latter. 

Me, personally, I'd choose the 40 mm tubes for 60 mm tires over fatter ones, for the weight saving. (And note that I have been accustomed to patching well over 150 flats per year where I live, before modern sealants came around).

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Patrick Moore

Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum

[Patrick Moore]

This addendum requires clarification: I meant to say that I've not found that "stretching" skinny tubes in fatter tires leads to more flats per mile, either without sealant and with patches, or with sealant and without patches.

On Mon, Jun 29, 2020 at 8:58 AM Patrick Moore <bert...@gmail.com> wrote:

... (And note that I have been accustomed to patching well over 150 flats per year where I live, before modern sealants came around).

[Garth]

That's good to know as for my Susie I bought Schwalbe SV19A(ultralight) tubes and by golly those babies are gonna fit 2.6" tires no problemo !