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I’ve run a 2.2” tyre on a rim that’s 38mm external (so must be 34-36mm internal) and has no issues.
I did worry that the sidewalk might be more vulnerable being that it doesn’t pull in to a narrow rim but it never actually seemed to be an issue and that was with a Conti RaceKing so quite a lightweight tyre.
M_V
gbj_tester
Is a 36mm internal rim on the wide side for 2.2” / 55mm tyres? Should I err on the side of caution and go for 30mm internal instead?