Quote Originally Posted by nigelp View Post
I was running Michelin S12's with 2/3 tread left. I had he pressure at 15psi - admittedly sitting down.....

It really ruined my flow (confidence) during the ride - will have to find some steep hills to practice on around here - the rest of the ride felt ok on the bike just that sketchy part.
Knobblies. Awesome Unless it's wet I haven't found tread to matter much on descents, but knobblies are (as a rule) a softer compound and more 'flexy' construction than those A/T style bike tyres, which does help.

10-15 is all good. Depends if you're loaded up or not too. I'm rarely loaded to the teeth so I go as low as 8, but it's usually on accident (I just open the valve and do the scientific as 1 PSI a second count).

I reckon if you stand up next time you'll instantly find it much easier and natural reflexes will kick in regarding where your body should be.
You'll probably go a little faster as you won't be doing the start stop shuffle that usually happens when sitting, but you will have more control and enjoy it a lot more for sure.