The benefits of a tire warmer are obvious: It keeps the surface rubber of the tire hot (170-210 degrees F, depending on tire brand and compound). Having the surface rubber hot increases the coefficient of friction of the rubber, increasing its ability to grip the track surface.
More subtle issues become apparent with time and usage of the tire warmers. The benefits include:
* Heat-soaking the carcass
* Eliminating the chance of cold tire incidents
* Saving heat cycles
* Tuning your tires-brand and compound.
* Setting hot pressures and sizing your tires.
The practice of heat-soaking the carcass is almost as important as getting heat into the surface rubber. This means the tire is hot and stable throughout the carcass and inside the tire. Through the use of data acquisition equipment, manifactures have found that a tire with a surface temperature of 200 degrees has about 175-degree heat inside the tire’s airspace. This is found by a thermocouple passed through the rim, measuring the inside surface of the tire, actually touching the tire.
A tire’s carcass is more flexible when heated to race temperature. It is also more consistent. During actual use, a tire is deformed under braking, cornering, and accelerating due to the forces being applied. Of course, the tire is also part of the suspension, and suspension frequencies will change as the tire is warmed on the track. By warming the tire before the race, the tire will perform much the same at the beginning of the race as it will during the middle. This enables better choice of proper compounds, not to mention the elimination of cold tire incidents. The issue of heat-soaking is why the quality of insulation that a warmer uses is important; you want to drive the heat into the tire.
The cold tire accident is certainly more common on sub-50 degree days, but overzealous throttle application can get the same result on a 90 degree day. The tire still starts out cold, especially when selecting harder compounds for higher track temperatures or abrasive surfaces. The cost of an off-track incident can more than pay for a set of warmers, even if you’re not destined to be the class champion. Having a consistent tire on all days, in all conditions, takes one more variable out of the equation.
Here are the Two Brands Spears Racing is offering to their customers, both are amazing products with different designs and cost.