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Perhaps try the same 23mm tyre on a rim with a wider internal diameter. You might get a lower profile for the mounted tyre and enough clearance?
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It will be about the same tubeless. Maybe try wider rims, that would project the tire more in the horizontal plane. Also, some brands are bigger than others and tires stretch a bit over time.
I used to run 23mm in an 19mm internal rim, tubed. Never had a problem.
miro_o
Netakure
@Thankshallots
I have a rear tyre clearance issue that if anyone could advise on would be greatly appreciated.
I bought a probably custom 90's tri frame recently and the tyre clearance to the seat tube is tiny. A 700x23c clincher around 100psi on 15/18mm diameter rims rubs on the seat tube. Due to the move away from skinny tyres, 18c or 20c clinchers are hard to find and most are race orientated so don't have much durability. The clearance to the seat tube is around 22mm at on a 700c wheel without tyre. I have only really used clinchers but wonder if tubeless may have a lower profile tyre as they are run at lower pressures, especially on a wider rim.
The skinny tyre then leads to wheel width questions. The ETRTO recommendations seem to be on the high side. What would people recommend for wheel internal/external diameter for thin tyres as a real world low level limit?