Originally Posted by
carlos danger
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.
I’ll do you one better - I’ve run a 2.1 inch tire (53mm) on a 15mm rim. And taken that on black diamond trails. You’re absolutely right - there’s nothing sketchy about it.
However, my next wheels will be 23 internal and I’ll be running 25mm tires on them. The point of having a wide rim is that you get a lot of the benefits of having meatier rubber like better grip and more comfort without some of the downsides, like squirm or weight.
Also when you say “grinding pedals”.... do you mean with the inside pedal at the 12 o clock position? Because that’s quite literally laying the bike down. I’ll need to see some video evidence of that.