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I have spares of 700x25C tube for my old bike. I bought a new hybrid bike. Can I use them for my new bike with tyre size 700x35C?

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  • Keep those spares on your old bike, and get new spares for the new bike.
    – Criggie
    Jun 13 at 1:48

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What does the tube’s packaging say?

Usually they are specified to work for a relatively wide range of widths. It will says something like “18-622 to 25-622”.

A few percent above the spec usually works fine (e.g. using a 25mm width tube in a 28mm wide tyre). But if 25mm is the maximum for your tube then a 35mm tyre is probably way too wide and the tube is going to explode during the first full inflation.

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    Also consider the valve type (therefore its width) and possibly the valve length may be a factor with longer being okay, and shorter possibly not extending beyond the rim
    – Criggie
    Jun 11 at 9:26
  • Maybe not explode straight away, but will be very fragile due to being very stretched. Jun 12 at 20:17
  • @VladimirFГероямслава: I’ve been using Schwalbe SV20 tubes (extralight, 18–25mm width) with 28mm Conti GP 4 Seasons for quite some time. I had one sudden failure on a really hot summer day in bright daylight which could be related to using them out of spec.
    – Michael
    Jun 13 at 5:36

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