Originally Posted by
smashndash
EDIT: Your Shimano wheels and many others are actually a very outdated 15mm..
you can run 45mm on 15mm inner if you want to.
i run 52mm on 19mm inner, no problem there.
but yeas yo probably want to reside on 1,5x the inner width for very good support. or optimal support.
most rims today are 19-20 or so. so a 28-30mm will be very optimal. but you can go a lot wider if needed. A LOT!
My fendered lunskey ti rain/winter bike has about 19mm and 22 or so inner rim width. and i'm running a 32 up front and a 37mm rear schwalbe marathon supreme, and i can basically lay it down until my pedals start grinding on the ground. with confidence too. and nowhere and no time does this feel sketchy nor unsafe. i can basically put that bike into the ground before it starts getting weird. and i guess thats how it works with all bikes. and all suffieciently good tires. i can vouch for this at least.