2026 Generation | Maximum Traction. Ultimate Versatility.

Introducing the EN1 Grand Prix Spec B, the all-new 2026 high-tread evolution of our Grand Prix enduro platform — developed in response to rider demand for more traction, more versatility, and zero compromise when FIM and ACU regulations don’t apply.

Built using Plews Tyres’ latest softer wet-grip compound and next-generation UK-designed carcass construction by Technical Director Ashley Vowles, the Spec B delivers exceptional traction, control, and confidence across the widest possible range of riding conditions.

With an increased 15mm tread depth — compared to the 13mm race-restricted FIM version — the EN1 Grand Prix Spec B offers significantly enhanced bite in mud, soft terrain, rocks, roots, and extreme conditions.

This is the world’s first FIM-style 140/80-18 enduro pattern engineered with higher tread depth — something riders have been asking for, for years. Now delivered.

Key Features: 

• All-New 2026 Soft Performance Compound
  Purpose-built for superior wet grip, cold condition traction, and all-round performance while maintaining excellent durability.

• Next-Generation UK-Designed Carcass
  Optimised for improved footprint stability, rider feedback, impact absorption, and traction under aggressive riding loads.

• 15mm High-Traction Tread Depth
  Delivers increased grip in soft, technical, and extreme terrain — perfect for riders who want maximum performance beyond race restrictions.

• Tread Design and Tyre Geometry: Engineered for maximum grip and comfort, the EN1 pattern features a meticulously crafted tread design aimed at reducing chipping, chunking, and premature block tearing, ensuring durability and longevity while maintaining optimal performance.