Re; tyres. Or, tires. The Schwalbe Kojaks are very fast on my D9. They're at 100 psi. Lord knows what they are like in the rain, but on a piece of damp tarmac the other day, I had a 'moving' sideways moment. I regard this as a bonus. Grip is for wussies. :-)
I wish I was at the store when Ridefreemc walked in and said 'I'd like five of those please.'