e*thirteen Expands the Grappler Tire Platform, Adding a Radial Casing

e*thirteen has significantly expanded its Grappler mountain bike tire platform, introducing a new radial casing alongside fresh rubber compounds, tread patterns, and rear-specific designs. Originally launched in 2022 with a focus on gravity riding disciplines such as enduro and downhill, the Grappler has evolved from a single tyre model into a more diverse family of tyres tailored to different riding styles and positions. The highlight of this expansion is the introduction of the Flux GR Radial casing, which promises enhanced traction, support, and sidewall stiffness thanks to its super-stiff Dual Apex Sidewall Inserts. The new radial casing is designed to offer a larger contact patch—claimed to be 30% greater than non-radial equivalents—resulting in improved grip and comfort by acting as an additional form of suspension. Unlike other radial tyres that often require higher pressures, e*thirteen suggests that riders can maintain near-normal tyre pressures even on rocky terrain, thanks to the robust construction and extra bead support that also helps prevent pinch flats. Alongside the Flux GR Radial, the Grappler range also includes the non-radial Flux GR casing with GR Apex inserts for durability and lateral stability, as well as the lighter, faster-rolling Flux AM casing aimed at all-mountain riders. In terms of rubber compounds, e*thirteen offers two options: the ultra-soft MoPo compound, which uses 42a durometer rubber for maximum grip and vibration damping, and the Momentum dual-compound, which combines a firmer 50a centre with softer 42a shoulders to balance durability with performance. These compounds are intended to suit different riding needs, with Momentum being particularly recommended for rear tyres and eMTB use. The expanded Grappler lineup now consists of three distinct tyres: the original Grappler with versatile casing and compound choices, the rear-specific Grappler RS featuring a 2-2-2 tread pattern for improved braking and rolling speed available only in 27.5”, and the Grappler TR, which shares similarities with the RS but is positioned differently within the range. This expansion reflects e*thirteen’s commitment to innovation in mountain bike tyre technology, particularly in adopting radial casing construction, which has been a growing trend in the industry. By offering a broader selection of casings, compounds, and tread designs, the company aims to cater to a wider spectrum of riders and terrain preferences, from aggressive gravity riders to those seeking faster rolling and lighter tyres. The introduction of rear-specific tyres also underscores the brand’s focus on optimising performance through specialised designs rather than one-size-fits-all solutions. Looking ahead, the Grappler’s new options could influence rider choices by providing more tailored solutions for varied trail conditions and bike setups, especially in the growing eMTB market where traction and durability are paramount. e*thirteen’s approach to maintaining normal tyre pressures with radial casings may also encourage wider adoption of this technology, challenging the conventional wisdom around radial tyre setup. As the platform continues to