FOCUS has taken their proven carbon-frame technology into the 27.5 wheel frame market with the Raven 27R. This is the perfect compromise between the agility of a smaller 26 platform and the comfort and performance of a 29er. Shlomy Haimy, Israel National Mountain Biking Champion and one of the top performers on the World Cup circuit, rocks the Raven 27r to numerous victories. 27.5″WHEELSIZE For a nimble yet performance driven comfort. Advantages of a 27.5″ wheel size: The time and effort needed to accelerate a wheel relates to its diameter. A 26″ wheel has the least rotating mass so is quickest to accelerate. The 29″ wheel enjoys the least rolling resistance once underway. A 27.5″ wheel is a compromise of the two. A large diameter wheel offers improved rollover on uneven surfaces. Its greater radius allows it to glide over closely spaced bumps, maintaining momentum and cornering speed. A 27.5″ wheel is a popular compromise because it only weighs slightly more than a 26″ wheel of the same construction and tire type. The weight increase for a 29″ over a 27.5″ wheel is around the same as from the small to the mid-size wheel. TAPERED HEADTUBE A tapered headtube is far supreme in handling, particularly when cornering and high speeds and stiffness over a traditional non-tapered headtube. The Raven 27.5 uses a 1 1/8″ standard for the top and the 1.5″ standard for the bottom. CHAIN STAY PROTECTION COVER Protection against chain suck. Cause damage from chain suck sucks. The Chain Stay Protection Cover excellent protection against the ill effect of chain suck, damage to carbon frames. Also, if the chain drops, chain stays sustain no paint damage. INTERNAL CABLE AND LINE ROUTING Internal cables and lines provide protection against the elements as well as looking clean and beautiful. Internally routing cables and lines protects them against the elements, extending their life.