Asking those with Excedra Max 240/55 and Avon Cobra 140...

[Ishrub]

I run 40 and 40 because it's easy to remember

4 digits on each hand x 10 hey? You could then take away 2 thumbs for a front 38, or add 2 thumbs for a rear 42 w/o challenging the noodle too much though

 

[TasRocketRider]

Dont the centers wear out at those pressures?

You will discover your front tyre cupping to side of the centre line rather than the centre. A Rocket phenomenon!!

The rear that just gets shredded way to quickly!!

 

[1olbull]

I run 40 and 40 because it's easy to remember

I used to run 20 20 Mad Dog . . .
Right down my gullet with a brew.