| And I thought most of it was to do with keeping the heat cycling of propper race rubber to a minimum. As for CSS instructors crashing on D207RRs which is a road tyre thats a bit worrying does that mean all road tyres need to be put in warmers before you go out on them.
As for tyre warmers I use HHW and before these I used Euroquip ones, ideally you will need a 1000Watt generator to get them to work properly or at some circuits you can hook up to the mains (Not always possible at race meetings) At Mallory and Donington the outdoor supplies require a Blue 240V round pin plug. In my race van a carry a 25m extension lead with these fittings along with a piigy back lead that has two sockets coming out of one plug, ideal for cutting into somebody elses hook up if they are all taken, I also have a 4-way normal 13amp extension block connected to one of these 2 blue plugs. This give me the choice of plugging my tyre warmers into either my generator or a paddock mains supply. | 
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