Haha…loving the OCD on this thread!…to be honest it bugs me when i look down at my front tyre and its not seated ‘straight’ on the rim too…as it rotates it gives the impression the wheel is buckled, which it isnt obviously but i find it distracting for the rest of the ride and usually end up buggering about with it when i get home….i still use tubes so i put the tyre on, pump it up a few psi then squeeze the tyre away from the edge of the rim all the way round. add a few more psi, squeeze tyre together between my hands and away from edge of rim again….repeat until you have the desired pressures and the tyre will usually sit straight.
I’m sure having the tyre not quite true on the rim isnt an issue performance wise but again the OCD part of me tends to think that the tread isnt quite hitting the ground perfectly as the designer intended it to and bizarrely enough this does then play on my mind and hamper the way i’ll ride and the speed i hit stuff….all psychological i’m sure but tyres are my nemesis from a psych point of view and stems from my motorcycle days when a crappy set of tyres was instantly noticeable and borderline dangerous to ride with….obviously things arent that dramatic with MTBs but old habits die hard!