Join Date: Aug 2008
Location: Ann Arbor, MI
Bikes: '15 Kinesis Racelight 4S, '76 Motebecane Gran Jubilée
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Yeah, this is virtually a non-issue, as virtually all road tires will fit any road rim securely. There are extreme and unusual combos which might cause concern, like trying to stretch Conti GP Attack 22c tires across 30.2mm bead seat width Belocity Blunt 35s, but then, why would anyone do that? (I run 26.6mm bsw Blunt SE rims on the road with 28c Vittoria Randonneur Pros on my commuter/ute; sweet setup!)
And as mentioned earlier, "rim width" is not the critical measurement in tire fit security questions. You need to know the bead seat width, or inner width. Outer width can be important for caliper brake users pushing the width limits, can describe the way the sidewall will sit in relation to the brake track, and give insight into rim durability, bit it's irrelevant to tire retention and shaping.
In general, higher rim BSW/tire width ratio will enhance handling. Fat tires on narrow rims are more likely to deflect the sidewalls under side loads (i.e. cornering).