Originally Posted by
FBinNY
The other drawback is much more subjective. It's the floppiness that wider tires on narrow rims have and how that effects handling, especially at lower pressures.
Agree - don't underestimate how disturbing this feels. I put some 37mm tires on 13mm rims and everything was fine but it made cornering at speed feel like I was riding on jello.
I doubt this will be an issue with OP's fat rims though.