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OK to use 28/32c inner tube as a ‘get me home’ for 38mm tubeless tyres?

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  • August 19, 2018 at 11:03 am #28858
    jimbop

    I’ve just upgraded to tubeless wheels and tyres (Hunt 700c 4Season Gravel Discs and Schwalbe G-one Allround 38mm) and am carrying a tubeless repair kit with worms for any punctures that the sealant can’t handle.  I have a lightweight 28/32c inner tube that I am hoping I can use as an emergency ‘get me home’ backup if the tubeless worm repair doesn’t work but I’m not sure if that’s workable.  Obviously I could get a wider/heavier inner as a backup but I’m hoping that the chance of using will be slim and if I do have to use an inner then it probably wont be ridden on very much so saving 50g and a couple of quid seems like it’s worth posting this question for.  Any comments?  

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  • August 19, 2018 at 6:11 pm #925603
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    hawkinspeter

    I agree that it should be

    I agree that it should be fine, but you’re more likely to puncture.

    Something else to consider is that you’re quite unlikely to use it, so the rubber might deteriorate over time and you wouldn’t find out until you tried inflating it (or slightly over-inflating it in this case). Maybe test it every 6 months or so to check that it’s hasn’t split and still holds air.

    August 19, 2018 at 5:57 pm #925601
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    Anonymous

    a 32mm inner tube  in a 38mm

    a 32mm inner tube  in a 38mm tyre is hardly pushing the boat out and is fine as a get you home solution, as above will increase chances of puncture but. As for thrashing it on non existant descents …

    August 19, 2018 at 4:27 pm #925599
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    Anonymous

    Yes, it will work. You will

    Yes, it will work. You will stretch the tube a little thin and therefore increase the chance of a puncture but it will work. 

    August 19, 2018 at 3:24 pm #925597
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    mike the bike

    longassballs wrote:

    longassballs wrote:
    You can’t be serious?

    In a bid to prevent my cycling becoming too routine, too predictable and yes, too safe, I take the opposite approach.  Just think how exciting it will be, pedalling that last thirty miles with a 5mm hole in the tyre and a severely undersized tube in place.  I particularly look forward to that 25%, mile-long descent into a series of technical hairpins, edged by a strip of ageing and rusty Armco.

    Go for it my son.

    August 19, 2018 at 1:33 pm #925595
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    longassballs

    It may do. I haven’t ever
    It may do. I haven’t ever tried it. I think a more pertinent question however is, why take the risk? I don’t wish to be so direct but anyone trying to save a couple of quid on an inner tube should give up cycling, and surely the 50g saving is a joke? It sounds like an extremely uncomfortable ride home especially if on 38mm you’re off road. You can’t be serious?

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