The Tech R is the Competition tire member of AVON Tyres' family of Tech performance tires. Developed and manufactured by Avon Tyres Racing* in Melksham, England, Tech R Competition tires were developed for the drivers of competition sports cars, coupes and sedans who participate in North American autocross, track and road racing events in dry conditions.** On the outside, Tech R radials feature a high-grip racing tread compound molded into a symmetric tread design featuring a "slick" tread surface with two circumferential tread grooves. This maximizes their contact area with the track and allows them to be mounted on either side of the car. Beginning with a tread depth of 4/32", they will not require shaving for competition, however they will benefit from heat cycling before competition to enhance wear and provide more consistent performance. On the inside, the Tech R radials feature a symmetric internal construction that features twin lightweight steel belts reinforced by spirally wrapped nylon along with a carcass that adds an aramid- and steel-reinforced sidewall filler to three nylon cord plies to resist deformation at high speeds and when cornering. Avon Tyres Tech R radials feature an attractive, graphic sidewall design with black letters and include a "rim recess" design on all sizes. They are Z-speed rated and available in 60-, 55-, 50-, 45-, 40, 35-, and 30-series sizes for 13" to 18" wheel diameters. NOTE: While the Tech R radials have an inflated shape with rounded shoulders to complement camber challenged cars, they still benefit from vehicle alignments that offer significant negative camber. *Avon Tyres Racing enjoys a worldwide reputation for success on the track, and supplies race tires for F.I.A., Formula 3000 and the global Formula Ford series in addition to many racing series in the USA, including SCCA National and Regional Club Racing. The popularity and reputation of Avon racing tires continues to grow as more than 100 overall Championship winners are regularly recorded each year in more than 27 countries. **Caution: While Tech R radials meet U.S. DOT requirements, they are not intended for highway use as the expected miles of wear from their racing tread compounds is greatly reduced. The Tech R is not recommended for driving in wet conditions where there is the risk of hydroplaning. Drivers should drive cautiously at reduced speeds in these conditions.