The side wall of a DOT tire includes some important information. For example, this M&H tire shows the load range; the maximum tire load (2450 pounds) and the side wall and tread construction (2 ply and 5 ply respectively). You’ll also find the tire is directional (with an arrow pointing toward rotation).
Another thing to note is the DOT marking. For some racing organizations, this is mandatory if you're going to compete. There are a number of classes that restrict cars to DOT tires only. Some specify maximum tire dimensions. Others don't.
Tires destined for street car drag racing aren't restricted to a few sizes. Instead, all of the major tire manufacturers who offer tires for this marketplace have a full compliment of sizes available. When shopping for tires, it's best not to place much faith in the actual printed sizes. Just like slicks, you need to check dimensional charts. The P325-50R15 tire shown in the photo is a good sized radial, but it's not the biggest tire available either! See the next photo:
 The tape measure supplies a measure of scale for the tire. As you can see, it's no welter-weight. Manufacturers who offer dedicated drag race street tires can supply upwards of a dozen sizes for various car combinations. And don't scoff at the performances either. Some of the competitors have run in the 7.40 to high 7.50 range at speeds approaching 190 MPH with this rubber. |
In the end, you're going to find that radial tires designed especially for street car drag racing aren't slicks with a couple of grooves cut in them. Instead, they're dedicated race tires that were designed from the ground up for the application.
We should also point out that due to the reduced tread depth and the special compounds used in these tires, they should be used on dry pavement only and they really aren't suitable for extended highway use. Remember, these are specialized race tires.
SOURCES:
M&H Racemaster Inc.
Note: See website for closest distributor
PH: 800-299-8000 sales info.
PH: 330-337-3062 tech. info.
www.mhracemaster.com7/1/08