I have just had a Contiforce SM tyre fitted to the front wheel in place of the Ageing and worn out Pirelli but now the bike weaves very badly at 70mph +. Its most prominent after exiting a bend as the bike comes back upright its weaves until I back off.

Previously I had the front Pirelli with a rear Contiforce SM and experienced no weaving at all at any speeds.

I am running the tyres at 30/30 psi.

Anybody else experienced issues with these tyres and overcome them?

Pauli you are running too much pressure on a brand new tyre, bring it down to 28psi until the tyre is road worn / bedded in and then inflate gradually up to 30 if that is how you like it.

Why Capt ?

28psi, thats nearly flat!! i run my XTR tyres both at 33-35psi. Nevery had any instablity problems at speed be it new or old tyres (well unless you call sliding the rear over cow poo stablity problems)

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Plough on

the owners manual specifes 29-30 front and 32-33 rear as standard.

(suprisingly low i thought)

This is not low at all because as the Capt explained the XTX is not a sport bike. I never inflate my tyres over 29 psi. I tried those tyres some years ago and did not have the problems you mention. Could you describe the "shaking" in more detail ?

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1. You are a healthy big lad
2. You are running semi-knobblies and your bike is not a 17in wheeled supermoto.
3. Your fork is longer than the X

Because a Supermoto is not a Sportsbike and not a lot of people, (especially tyre mechanics) understand that these bikes are a lot different in traction and torque, the frame design requires that the better stability and handling are achieved with 28-29-30 psi depending on rider's weight. Big lads might need to inflate up to 33psi.

Sorry, my question must have been phrased badly.

Why would you start at 28 and increase as the tyre wears ?