Now that would be really useful.
I'm running Vredestein Ultrac's (not Sessanta) at the moment. Vredestein announced a new Ultrac Cento a short while ago which they claim is 20% lighter hmy:
That one is excellent... it seems I will get things REALLY sorted out for the first time!Also came across this, which will visually show you how tyre sizes and offsets will affect the profile of the tyre, and centreline of the wheel:
Wheel / tire size calculator / comparer - RIMS-N-TIRES