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GP5000TL are a really tight fit. I could not get them to seat properly on Mavic Open Pro UST rims even with ridiculous pressures. Pirelli Cinturato Velo and Schwalbe G-One Allround & Speed Evolutions were a lot easier to fit. Conti GP5000 standard non tubeless were an easy fit also. I would not want to use a tubeless tyre with a tube because they usually do have thicker sidewalls and with a tube will most probably roll slower and be more uncomfortable than a comparable standard clincher. On the other hand Pirelli claims that Cinturato can be used with a tube or tubeless...
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GP5000TL are a really tight fit.
I know. Try getting a tube in them too. The idea behind using the TL version was to get the sidewall durability but I gave up on that idea and move to the Michi. I think I'll just get GP 5000 tubetype for the grrl's bike since that's what came with it, but I'll see if 28s fit first. On mine I'll shift front to back and then stick something new on the front.
Schwalbe Pro One TLE Addix 2020 TL High CRC 25 / 26 245 / 263 10.2 11.2 Pro Pro 43 / Pro 2.7 / Pro 4.0
These are the 28-32mm tyres with "40" p resistance and max of 13 Crr @ 120psi
https://www.bicyclerollingresistance.com/road-bike-reviews?maxweight=300&as=28-584&as=28-622&as=28-630&as=28x19&as=28x21&as=28x22&as=28x23&as=28x25&as=28x28&as=29-622&as=30-622&as=31-622&as=32-622&as=32-630&as=28-406&as=28-559&r=41-42-43-44-45-46-47-48-49-50&max=13&min=6&minpr=40
Continental Grand Prix 5000 TL 2018 TL High CRC 25 / 27 300 / 295 8.3 8.9 Pro Pro 47 / Pro 2.8 / Pro 5.0
They're all expensive TL which worries me, having fitted a GP5000 TL with a tube before.