650B

The Ground Control Sport is an exceptionally versatile trail tire that uses a tread optimized using Finite Element Analysis. This means that it rolls fast and provides increased grip and traction in nearly all conditions. - Casing: 60 TPI - Bead: Wire - Compound: 60a - 27.5 x 2.1", psi 25-50 - 27.5 x 2.3", psi 25-50

Specialized's Nimbus Sport tire has a smooth tread that rolls fast and serves as the perfect fit for any rider looking to get around town. There are many widths to accommodate different models, riding styles, and comfort levels, while the BlackBelt flat protection found here adds confidence for riding over rough city roads and bike paths. - Casing: 60 TPI - Bead: Wire - Compound: 70a - Flat Protection: BlackBelt

Specialized's Hardrock'R is a long-lasting tire with an aggressive, yet smooth-rolling tread with multi-directional knobs that are sure to improve traction and cornering over mixed terrain. And with the added benefit of its Flak Jacket flat protection, you'll be sure to hit it all with confidence and control. - Casing: 30 TPI - Bead: Wire - Compound: 70a - Flat Protection: Flak Jacket - 26 x 2.0"; psi 35-65; approximate weight 880g - 650b x 2.0"; psi 35-65; approximate weight 960g - 29 x 2.0"; psi 35-65; approximate weight 1000g

The Purgatory GRID 2Bliss Ready tire is the standard-bearer for light trail tire performance. The new, completely redesigned tread pattern features square lugs that bite in on soft soil, while still providing support on hard-packed ground. Additionally, flexible center sipes fold out under braking force for increased ground contact and adhesion. For further peace of mind, the GRID casing provides the utmost in cut and flat protection at the sidewalls. And, to top it all off, our proprietary GRIPTON compound helps make this the perfect choice for epic trail rides in any condition. - Additional sidewall protection for exceptional durability, plus sidewall stiffness for stability - Folding bead - 2Bliss ready