nobody mentioned that you'll most likely go thru 3mm+ of tread on a track - it's ok running nearly dead tyres but won't it be a bummer if your are half way thru the day and the carcass is showing??? :)

[Edited on 5-5-2005 by moozaad]

Each heat cycle cures the rubber a little bit more, so the tyre hardens with every heating it gets. Less grip over time. This is why new rubber always feels so good (to me anyway!).

I used some Sportecs that had done about 3 trackdays and about 800 road miles - loads of tread left - they let go without warning and spat me off at a very hot track day at Donington - the surface rubber had smeared when I checked them afterwards - as if the top layer had liquified!

However testers have commented that Sportecs go off quite quickly and it was one of the hottest days of 2003, but the same will be true of all tyres to different degrees.

The sportec M1 is the same compound and construction as a Diablo. Its also made in the same factory. The only real difference is the tread pattern on the front tyre. The sportec has larger tread blocks on the centre line of the front tyre. This seems to lead to problems with the tread tearing itself in the blocks of tread. I spoke to CPK the Pirelli Metezeller importers about this and they denied that there was a problem. Its happened to me and I have seen it on many large bikes using this tyre. I was at intermot last September and I saw at the Metezeller stand only sportec rear tyres on display so I think that they must be working on a solution. In light of my experience I would stick to Diablo's.:cool: