- With all-round protection. DD stands for Double Defence. In addition to the RaceGuard protection belt there is an effective fabric protector on the sidewall. **Features:** * PROTECTION: RaceGuard Double Defence - A double layer of nylon fabric plus an extra layer, for excellent puncture resistance * SIDEWALLS: SnakeSkin which is a light and flexible carcass that makes the tyre highly resistant to scrubbing * COMPOUND / TPI: Dual compound with two different rubbers for optimal performance / 67 TPI * WEIGHT: 355g (23c Rigid) / 385g (25c) 430g (28c /Rigid)