Originally Posted by
FBinNY
There's plenty of latitude in rim/tire width ratios. The published guidelines are just that "guidelines" and can safely be taken with a grain (or more) of salt.
More like a truckload of salt. My mountain bikes are using Mavic XC717 rims that have a 17mm internal width. I use 50 to 55 mm tires on those rims without issue and have regularly for more than 20 years. On my touring bike I have Velocity Deep V which have a 13mm internal width on which I use 35 to 38mm tires. Again, no issues.
The “guidelines” aren’t!