zazenzach

I keep getting a flat in the rear (sometimes on inner sometimes on outer side tube). Ive inspected/dissasembled it rigourously but find nothing. I've replaced the rim tape, replaced the tubes several times, and have even bought a brand new tyre. and still i get flats. Ive even experimented with my tyre pressure, going from 120 PSI to 100 PSI... still flat....

Only thing I can think of now is maybe there is too much weight on that rear tyre? Is there a weight limit for narrower tyres? My tourer and grocery getter has 25's and after loading it up with groceries my bike can be as heavy as 230-250lbs (Im 6'1 ~185lbs).

I'm at my wits end here!