I need three lots of different tubes believe it or not!
Just had a puncture on my crosser therefore needing another lot of 700's and then used my 29er for the commute on friday and that has now a flat!
29 x 2.1
700 x ?
26 x 2.1
on the widths is it important whether they are 1.9, 2.1 or 2.3s?
I find it all very confusing...should i just buy the tubes to the tyre width?