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Old 2013-01-21, 07:25 PM   #6
Rex Ewokii
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Join Date: Jan 2012
Location: Nuremberg
Posts: 333
Normally I'd say: just look up what is the minimum recommended width as according to ETRTO, whose table Schwalbe cite on their website, but sadly it doesn't extend far enough into the realms of special mining applications for rims that wide.
Your inner rim width should be about 36mm or "36c" (42-6, rule of thumb).
The table goes only to 29.
Extrapolating with a quadratical model (and adapting the model to fit all data points), I calculated a minimum width of 75mm or 3". A ridiculous result.
Maybe the original table in the ETRTO standard is more complete. You could buy it for a mere 114 Euros to look up the recommendation, a real bargain.

Or more easily: just make use of nlouis1's experience and try tyre width=inner rim width+6 -> 42-622, maybe Vittoria Randonneur.
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