interesting stuff.

i've been meaning to dig up some articles from a few years back. a local town chip-sealed a road and they were able to work with the paving company to do it in a 'cyclist-friendly' way. it helped that the owner of the paving company is a cyclist.

there were some interesting observations. i believe they found a way that didn't materially increase the costs or time to complete the project. i also believe it had something to do with the size of the aggregate (perhaps combining multiple sizes) and with the order of laying down the layers.

i ride chip seal all the time (northwestern wyoming). maybe i'm just used to it, but at 95psi on 23s (i'm about 150) i don't find any issues. 75psi on 28s is pretty dreamy, though.

120psi on the supersonics? do you find that to be fastest? i'm a little surprised by that.

PS i've been reading all your posts and the subject made me recall a situation i faced a few years ago. a local route was being chip sealed. it was a 25-mile stretch i'd incorporate into almost all my rides. i rode it the day before they sealed it and the next day it was available. it went from being my favorite stretch of road to unbearable (for me). i was riding an aluminum orbea at the time. i was SO bummed as it is 1/2-mile from my garage.

i demo'ed a roubaix (same wheels, saddle and tires/pressures) and found myself doing that stretch of road twice...and loving it. i no longer have that roubaix but the frame really did something for me. to be fair, it could have been the different geometry or the bars and tape contributing to the ride quality.