If your next race is, say in 3 hours, but you want to keep heat in the tires without roasting them; viola.
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For when you and your buddy are splitting a generator, and kinda-warm tires are better than cold tires :)
Some rain tire manufacturers also suggest using a low setting on tire warmers, especially if it's a warm day and the water on the track won't cool them off too much. See Pirelli's info on their rains (under technical advice) where they recommend a warmer temp of 122 degrees. I believe the 'low' setting on the moto-Ds is 130 or 135, which is pretty close.
I like the Capit's, they have worked very well for me, no more tire issues after I bought a set.
I've had numerous sets of tire warmers and by far my favorite are the chicken hawks. Can't go wrong. John Hutchinson w/ SCRC is a vendor, too.
Chicken Hawk without fail. They've been doing it a LONG time and have incredible customer service should you need it. Also remember that the carcass isn't fully warm until you can feel the heat in the wheel spokes. Hutch is a wealth of knowledge for this stuff.
Chicken Hawk.
I have a set of chicken hawks bought on 3/20/2014 and the rear warmer quit sunday morning. Those were my first set of warmers so no idea how long they usually last, just figured I would throw a data point out there.
Capit
Guaranteed for 3 years
• Uses Teflon Heating cables (10 times longer life then silicon heating cables)
• No electronic or mechanical devices used for heater element (reduces risk of failure)
• Requires only 650W per pair compared to 1000W for typical tire warmers
• 100% waterproof inside and out