We've used these extensively ourselves and found them to be an excellent tyre warmer. They have a little light to indicate the temperature and fit really neatly. The sets we had for our own bikes (actually used for supermoto racing) were used for over 3 seasons and were still in great condition. We actually sold them as used parts to a local racer and they're still working - 5 years on!
Handy Tip about Tyre Warmers: Take your warmers off before dropping the bike down from its stand. The only time we've seen people ever damage tyre warmers was from taking a bike down off the paddock stand with the warmers on and leaving it sitting for a few minutes. The heated wires melted the material outer. Did you know? Bike It were nominated as official tyre warmer supplier to the Virgin Media British Superbike team, the team used BIKETEK tyre warmers for the 2007 season. We stock range of the same BIKETEK warmers as used by the BSB team, available in superbike size as well as two smaller versions for smaller tyres. Each warmer is thermostat controlled, using a dual led red/green indicator to display heating and readiness. Elasticated sides are featured for ease and accuracy of fitment. Full instructions supplied.