what are the absolute biggest tires l can fit on a stock 2001 chevy s10 blazer 4x4?

are 85 s 10 blazer is running 33's

SAFELY 31'' , any bigger and you will have to crank up the tortion bars, or your tires will rubb. One you tighten the tortion bars the car will drive like crap.

using the stock 15 inch wheels, l have placed 275x60x15 summer tires all around. l would suggest adding on 2 inch wheel spacers on the back so that both front & back tires r in the same track. l noticed that the rear end is about 3 inches narrower in width than the front. The largest winter tires would be about 31.5x10.5.15 but they might rub while turning. l would suggest getting air shocks in the rear, due to that the rear suspension on these vehicles get kind of soft in age. Best of luck.