No manufacturer is ever going to suggest running a 36mm tire on a 41mm external rim. Ever. Especially offroad. There's no way they function properly, as you've found, and rim damage is practically a given at some point. Much wider? Thundero 40mm measures at 43mm for me. That's 4.9% wider, or 1.5mm / 2.45% each side. The 105% rule isn't really a rule, and it's pointless following it for these rims as they're nowhere near deep enough relative to their width for it to be relevant. This rim is about stability, and arguably reducing tire deformation with less mushrooming, leading to lower rolling resistance (and potentially an aero gain that way).rulefive wrote: ↑Sat Dec 17, 2022 4:28 pmMy AGX45 wheelset is used for road and fast gravel. My opinion is that this is the primary use case for this style of rim - to provide stability and an aero friendly profile when using wider tyres.
My preference for running a 36mm tyre is that on the AGX45 it will end up measuring about 40mm which lines up nicely with the rim. Going to the 40mm tire is likely to negate at least some of the benefit of running the AGX45 as the tyre will end up a lot wider than the rim.
Also note that the Speedero should be faster than the Thundero because the knobs are lower profile and more aero, something that BRR et all don't test for.
If you're worried about the minute aero gain between the Speedero and Thundero, then presumably you wouldn't be running these rims, as they're way too wide.
If you want mixed road and gravel use, and want aero gains, then you'd have been much better with the ARX49 from Nextie, or similar rims from FarSports or LightBicycle. The 36mm Challenge HTLR tires should be fine on 31-32mm wide rims, unlike these monsters.
IMO the Panaracer GK 38s (40 ETRTO) are too narrow for the AGX. Thundero 40s are the narrowest I'd ever go.
