Inner Tubes

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Jo25

Senior Member
Hi,

Very basic question I hope you can help me with, please?

Can I use an inner tube that is 700 x 28/37C to replace one that is marked 700 x 28/38C?

Sorry for such a numpty question, but I really don't understand how all the sizing works!

Cheers!
 
You buy the tube to fit the tyre so a tube marked as 700 x 28/38c will be okay for a tyre between 700x28c and 700x38c.
Of course in reality it is still okay to use a tube in a tyre which is a bit outside of its rated size but there's no real reason to go too far.

So, yes, using 700 x 28/38c to replace a 700 x 28/37c will likely be fine.


If you want to know about what tyre sizing marks actually mean you could start here.
 
OP
OP
J

Jo25

Senior Member
It is actually the other way round, using a 700 x 28/37C to replace a 700 x 28/38C, but I assume the answer is still yes, it is ok to use it.

Thanks for the help!
 

e-rider

crappy member
Location
South West
a tube is made to fit a range of tyre sizes

the 700 number is the wheel size - this doesn't change as your wheels are a fixed size - most road bikes use 700 wheels

the 28/38 is the range of tyre widths that the tube will fit in mm.

so any tyre from 28mm wide to 38mm wide.

is your tyre in that range?

if you replace a 700 x 28/38 with a 700 x 28/37 then only if you had a 700x38mm tyre would you have a problem - and even then it would actually be OK anyway as the numbers are only guidelines and 1mm won't make a difference.
 
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