Schwalbe Big Betty Tire - 29 x 2.4 Tubeless Folding BLK Evolution Super Downhill Addix Ultra SoftSchwalbe Big Betty Tire 29 x 2. 4 Tubeless Folding Black Evolution Super Downhill Addix Ultra Soft. Equipped with everything modern tire technology has to offer. A Downhill and Enduro Allrounder for dry to damp conditions. Big Betty works perfectly on the rear wheel when combined with the much loved Magic Mary. Long supported braking edges for maximum braking traction Extremely stable shoulder blocks for outstanding cornering grip Open and aggressive