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Cyclocross Frames, Wheels & Components / Re: wheels for larger tire widths
« on: July 18, 2023, 05:22:05 AM »
19mm internal width is fine. Until 5-10 years ago youd be very hard pressed to find a 700c rim with more than 19-21mm internal width. Ive dont heaps of cyclocross/touring/etc on 19-21mm rims with 32-45mm tires.
It seems like the current trend in "wide" road tires, ~28-32mm, is to have the tire be 1-2mm wider than the *outside* rim diameter. On carbon rims this is a tire thats ~8-10mm wider than the inside diameter. This is more "aero" and matches the tire width well to the modern inside diameter. eg A rim with ~24mm ID would be ~31mm OD and match a ~32-33mm gravel or rando tire. More realistically 21-23mm inner rim would "match" with 28-30mm tire widths butcould certainly go larger. *DO NOT* go with a tire thats narrower than the rim width.
> what width rim tape did you use? my carbon wheels didn't have any tape. maybe the 18mm tape I used was too wide
I suspect your tape wasnt even inside the rim, or teh tire beads didnt sit correctly. Your tape should be ~5mm wider than the internal rim width to account for the spoke bed divot. You want the tape to come up on the bead seat, at the very edge of the internal rim, and have the tire bead sit on the rim tape. Wrestling with the tire sidewall or going up to he max pressure to get beads to sit correctly is a timeless tale.
For myself Im using 25mm inner rims with a beadhook for 33-38mm "all road" tires which are really just light casing tubeless tires with a a file tread.
It seems like the current trend in "wide" road tires, ~28-32mm, is to have the tire be 1-2mm wider than the *outside* rim diameter. On carbon rims this is a tire thats ~8-10mm wider than the inside diameter. This is more "aero" and matches the tire width well to the modern inside diameter. eg A rim with ~24mm ID would be ~31mm OD and match a ~32-33mm gravel or rando tire. More realistically 21-23mm inner rim would "match" with 28-30mm tire widths butcould certainly go larger. *DO NOT* go with a tire thats narrower than the rim width.
> what width rim tape did you use? my carbon wheels didn't have any tape. maybe the 18mm tape I used was too wide
I suspect your tape wasnt even inside the rim, or teh tire beads didnt sit correctly. Your tape should be ~5mm wider than the internal rim width to account for the spoke bed divot. You want the tape to come up on the bead seat, at the very edge of the internal rim, and have the tire bead sit on the rim tape. Wrestling with the tire sidewall or going up to he max pressure to get beads to sit correctly is a timeless tale.
For myself Im using 25mm inner rims with a beadhook for 33-38mm "all road" tires which are really just light casing tubeless tires with a a file tread.