TRACTION IS EVERYTHING EN1 TOUGH ONE Ultimate Extreme Enduro “Super Soft” tyre. The tough one is a Super Soft Extreme Enduro front and Rear tyre. The rear tyre features a super sticky compound with world leading performance. The carcass features a lightweight polyester super flexible construction for super tricky technical races.  Both tread design and tyre construction design have been tailored to fit Extreme Enduro races.