The NT01 also has a few features that differentiate it from other DOT race tires. The body plies of the tire are made of rayon instead of the usual polyester. Rayon is a lot more heat resistant than polyester but is perhaps a little less durable in long-term use as it is sensitive to water infiltration. Long-term use is usually not as important in a race tire.
On top of the body plies, the NT01 has two steel belts for tread stability; their stiffness helps keep the tread flat on the road. An aramid cap ply is also used over the steel to control growth at high speeds helping to reduce heat buildup. The NT01 also has stiff sidewalls with a long turn up reinforced with steel to help response and for cooler running.
The NT01 is nearly treadless so it is not so great at all-weather performance but we have done pretty well racing it in the rain at full tread depth. Take note that this tire is not really practical for climates other than our sunny Southern California and other sunbelt locations.
In the area of the outer shoulder, the tread blocks are super large, nearly a slick and the inner shoulder has smaller blocks which work to evacuate water. The tire can be shaved to 3/32’s of an inch for the best dry performance in which case it turns into nearly a slick with two grooves but we usually run this tire at full tread depth and it works fine with no chunking. Tire life is better at full tread depth.
Our new tires are much wider and slightly shorter than the stock tires. The wimpy stock wheel tire combo weights 33 lbs 7 oz, which is 1 lb 9 oz lighter than our new wheel tire combo that is 35 lbs. This weight difference isn’t bad considering that our new tire is almost 2 inches wider than stock and our new wheels are a full 2 inches wider.
Our 15″x8″ Gram Lights 57Transcend and 225/45 Nitto NT01 combo fully fills out our wheel wells as you can see here. Fortunately, there was not one bit of rubbing even with our lowered suspension and we didn’t need to roll our fenders. We were really impressed with the fitment of this wheel tire combo.