Schwalbe Racing Ralph Rear 29" Tire If you're looking for a tire with aggressive tread but without the bulk, the Schwalbe Racing Ralph 29" Tire is your answer. The Racing Ralph Rear features low, fast-rolling center knobs for lower rolling resistance. The side knobs provide excellent cornering traction, making for a well-balanced, rear-specific cross-country tire. Schwalbe uses two separate compounds available to the Racing Ralph, TLE Evolution or TL performance. The Evolution line, outfitted with Schwalbe's Addix Speed compound, provides more traction, protection and is more durable than their base line performance tire, perfect for cross-country racing. Features Evolution line Offers better grip, and protection Addix speed Provides lower rolling resistance and increased durability Tubeless ready Allows you to run the tires tubeless. SPECIFICATIONSSize29"X 2. 10"29"X 2. 25"29"X 2. 35"Conditions Loose over hard, loose, medium Loose over hard, loose, medium Loose over hard, loose, medium Bead Folding Folding Folding TPI676767Compound Addix Speed Addix Speed or performance Addix Speed Protection Snake Skin Snake Skin or performance Snake Skin Type Clincher Clincher Clincher Tubeless Compatible Yes Yes Yes Intended Use Cross-country, Trail Cross-country, Trail Cross-country, Trail Approximate Weight675 g670 g, 735 g750 g | Schwalbe | Racing Ralph Rear 29" Tire 29X2. 25, Performance, Tlr, Addix