Exclusive to Brompton, the Marathon racer is the fastest and lightest Marathon. Greater tread depth and SpeedGrip compound for the best handling characteristics and lifespan. Raceguard Nylon fabric under the tread giving excellent puncture protection. LiteSkin sidewall. E-25 safety endorsement. Rated for pedelecs with motor assist up to to 25 km/h (15.5mph). Recommended for the Brompton Electric.