Originally Posted by
ksryder
This. I'd support you to try a 28mm at 80 psi. Don't pay attention to deflection or the fact that it feels different than you're used to. Go out for your normal 20-mile ride and when you get home look at the numbers and compare them.
You're always free to go back to 120 psi if it doesn't work for you.
Why..? I get that a lot of folks are 'getting away' with running lower pressure for comfort reasons, but I don't believe I've yet to see evidence of better performance, or proof that these lower pressures aren't more prone to pinch flats.
Here's the calculator results for 25 or 28mm tires, (I added 20lbs to accommodate the OP's bike/gear)
