Factory Edition SX series chain guides are designed for Motocross and Supercross. The "SX FACTORY EDITION" Guide is the ultimate performance affordable "Works" bike part. Ultra-compact and slim guide with a long-lasting, replaceable wear pad. Lightweight design reduces weight by between 40 and 80 grams. The wear pad and guide angle is setup for oversize sprockets reducing excessive wear on chain plates. TMD's exclusive return memory formula plastic absorbs impacts and resists bending under load. Rated a 5 stars out of 5 product from the leading motocross magazines. Used by KTM Canada and Orange Brigade teams in winning outdoor MX championship 4 straight years. Utility Patent # 9469379. Notes: The Factory Edition SX guide is for track riding ONLY. For off-road riding check out TMD's FE #1 or #2 rear chain guide options (sold separately).