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Blue Raccoon at 417Flyup.
I've done that.
I'd go for most grip possible - finding out where that is, will be dependent on what tyre and your body weight.
I'm by no means good at competitive bike riding, but on that trail I'm riding at my percieved limit in corners, and in some or most cases braking before them.
There are very few prolonged straight sections where a reduction in rolling resistance would be beneficial to me.
I've never gone under 25psi front and keep the rear close to 30psi using 2.4 tyres and weighing 77kg, I rarely flat or suffer rim dings, I think going as low as you can get away with is the wrong direction, it's interesting that Danny Hart's mechanic upped his psi without telling him for his win at Snowshoe.
Don't think anyone has posted this link yet:
https://axs.sram.com/guides/tire/pressure
Helpful to get you in the right ballpark, but don't be afraid to adjust if you feel the need.
We have to join a mixed bunch of roadies/mtbers tomorrow riding up and down mountain roads. No offroad. Pollution here spiked today so didn't want to be outside doing exercise.
As one poster says (15% sag), and some reading of websites, the max tyre pressure printed on the side of tyres is max pressure, not optimal.
Whilst offroad riding I know what I need. On road not so much.
We have tyres that say 60 or 65psi on them. What do you put in for road riding where there may be dust and mud on the roads, and occasional cracks from earthquake damage? 55 and 60, or 50 and 55?
Thread title should say "tyre pressures, speed, and grip"