- SPOCALC - Damon Rinard's cool downloadable Excel spoke length calculator.
- Reynolds - how tubing is made (at least how Reynolds does it).
- Columbus - finally with text in English too.
- AnalyticCycling.com - an awesome resource for the technically-oriented cyclist.
- Wheel Aerodynamics - comparative data on gadget wheels.
- Track Racer's Tech Spec's - my own reference page of technical specifications for track equipment.
- Fit Kit Systems - Industry pioneers in tools to assist with precision bike fitting, pedal cleat orientation and frame alignment.