CeramicSpeed Pulley Wheels Shimano 11-Speed - 12 Tooth Narrow Wide Alloy BLK Crank Intended Use-Tandem The Surly TPU or Thermoplastic

The Surly TPU or Thermoplastic Urethane tube is a tough airtight material lighter than traditional butyl innertubes

Frame Size 21 Wheel Diameter 20 Color Black clear Primary Color Black

Removable Rebound knob doubles as HSC adjuster

Peak Nano Optics Photochromic is equipped with a high tech lens in X-PC with photochromatic abilities that darkens and lightens up automatically to the strength of the sunlight (UV light)

5 Thread Length (mm) 9 Axle Diameter (mm) 15 Over Locknut (mm) 100 Overall Length (mm) 148

CeramicSpeed Pulley Wheels Shimano 11-Speed - 12 Tooth Narrow Wide Alloy BLK Crank Intended Use-Tandem The Surly TPU or ThermoplasticCeramicSpeed pulley wheels reduce friction last 3 5 time longer than stock high end pulleys and are designed to work with less drag. Premium Grade 3 Silicon Nitride Ceramic balls Hand built in Denmark Drivetrain Speeds 11 Fits Brand Shimano