Ceramic Speed’s OSPW X for SRAM Rival and Force 1 Type 3 Derailleurs offer a super fast pulley wheel system featuring 14-tooth upper and 18-tooth lower pulleys with a narrow-wide profile. The unique narrow-wide tooth profile of the pulleys ensures durable chain retention. The system is fitted with a custom designed strong carbon fiber pulley cage assembly for durability and lightweight. The cage design allows you to choose between two spring tension settings to customize performance and reduce chain drag.