Surly Singleator Single-Speed Chain Tensioner - Black CheckoutSpec= 1.5 Diameter The original ISM saddle

The original ISM saddle

One-piece caliper design for the best stiffness to weight ratio that results in improved lever feel and increased power (NOTE: GR4's are not compatible with vented rotors)

USB rechargeable battery

Tooth Count 50 Ring Position/Type Outer Drivetrain Speeds 11 Chainring BCD 110 Color Silver Defined Color Black Material Aluminum

Big Bore Valves are engineered with precision and designed to deliver maximum air inflation simply and efficiently

Surly Singleator Single-Speed Chain Tensioner - Black CheckoutSpec= 1.5 Diameter The original ISM saddleThe Surly 1x1 Singleator offers a reliable adjustable solution for tensioning chains on singlespeed drivetrains with vertical dropouts. Designed to mount directly to a standard derailleur hanger the Singleator features a triple sealed spring floating 11 tooth pulley and fully adjustable chain line. Its forged body and stainless steel pivot bushing ensure long term durability while chain guides and a wide cog capacity support consistent quiet