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They are 19mm internal and 25mm external.
There is only clearance for a 23mm tyre up frontWas looking for a picture to mark up, and somebody has already done it. With a relatively high pressure road tyre and no sideways landings off jumps, you're not all that likely to encounter this situation where the hoop stress in the carcase is pulling the bead with no restraint from the bead hook.
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gbj_tester
Ordinata
They are 19mm internal and 25mm external.
There is only clearance for a 23mm tyre up front and I want to use it for winter training on mixed surfaces, so the only way of getting more comfort was with wider rims, but I might be pushing it.
However, xm119 rim is wider than archetype and costs one fifth of it, so it's a cheap experiment and it doesn't matter if the rims get a bit scratched up :)
For now they're amazingly comfy and roll great with low pressure