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I always use the 90% max rule. I've been doing this for decades with good results. I get a lot of push back about this rule, yet I've always gotten good traction, mileage, wear, and comfort from my tires.
My tires are rated at 50 PSI max. Therefore, I inflate mine at 45 PSI (50 * 0.9 = 45). So far so good. Most people feel this is way too much for them. The ride may be stiffer, but I don't notice any unusual harshness or discomfort with that PSI.
Regardless of whether you inflate as high as I do or not, 33 PSI on a 50 max tire is only a 66% inflation rate, and just way too low IMO.
My tires are rated at 50 PSI max. Therefore, I inflate mine at 45 PSI (50 * 0.9 = 45). So far so good. Most people feel this is way too much for them. The ride may be stiffer, but I don't notice any unusual harshness or discomfort with that PSI.
Regardless of whether you inflate as high as I do or not, 33 PSI on a 50 max tire is only a 66% inflation rate, and just way too low IMO.