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Are the tyres seated properly? I've got a pair of Vittorias which are an absolute bastard to seat on my DT Swiss rims. Sounds similar to what you're describing when not seated properly. Have to pump them up to a stupid PSI until you hear them pop in to place, then you can deflate to your desired pressure.
ltc
@WillMelling
I've recently bought a couple of pairs of Cero wheels, which are really well reviewed and have been recommended on here. But both pairs have a problem - when I fit the tyres and tubes, they are 'bumpy', that is there are a couple of sections where the top of the tyre is higher (or lower). If you spin them they have a kind of wavy profile from the side and it's enough to be really noticeable if you ride them. I've tried every combination of new tyres, old tyres, new tubes, old tubes (which fit fine on other wheels) and it's the same. My only guess is that they are tubeless ready and have a sort of plastic rim tape already fitted which is not playing nicely with regular tyres (GP 4000s and 5000s). Anyone got any ideas or similar experiences? Thanks.