The Complete Handbook of Bicycle Cleat Shims & Wedges

The cleat-to-pedal interface is a critical, high-load mechanical junction that transfers over 300 watts of power through a contact patch the size of a credit card. When alignment is off by even two degrees, the knee tracks laterally, the foot supinates or pronates, and chronic pain develops in the knee, IT band, or Achilles tendon. Yet most riders and even many professionals select shims by feel or by following the vague instructions on a single product's packaging.

This handbook replaces that guesswork with a systematic, evidence-based approach. It covers the complete range of products, from simple single-degree tapered shims used to correct leg length discrepancies, to multi-axis wedges with varying durometers that change both the angle and the stability of the foot. It explains how to take meaningful measurements, how to translate a fitter's 'foot wedge' recommendation into the correct Shimano, Look, or Speedplay cleat shim, and how to avoid the common torque-wrench or thread-locker errors that ruin expensive carbon sole shoes.

Beyond technical installation, this book addresses the business of alignment. It includes guidance on stocking a professional fit studio's shim inventory, understanding the regulatory landscape (including ISO 4210 for pedal safety), and communicating the value of a shim fit to a client in a way that justifies a professional service fee. Whether you are a fitter, a shop, or a serious enthusiast building your own jig, this book is the definitive reference for a field that has previously been left to hearsay.