Global trekking, high-mileage touring, competitive racing, or rugged off-roading: Gates® CDX™ line of sprockets (including CDX:EXP and CDX:SL), perform in the harshest conditions. Rooted in technology originally designed for dragsters, our CDX line brings similar power, reliability, and durability to bicycles. Less weight. Instant engagement. More fun. CDX and CDX:EXP front sprockets are the best choice for high-mileage touring or rugged off-roading. Gates offers several lines of rear sprockets for peak performance in any environment. CDX, CDX:EXP, CDX:SL.