So I have a 26 inch mountain bike and the bike came with a tyre size of 26 × 2.0 and I was wondering If I could use 26 × 1.9 as I cannot find the tyres I want in 26 × 2.0.
Makes no odds with such a small difference. Tyre sizes are nominal, so two different brands with the same quoted size could be a fair bit different in reality.
Rims have a recomended min and max tyre size depending on rim width but this is only advisory information, not a rules, and tyre width sizing is as stated above, nominal.
1.9 and 2" are probably the same.
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