Analytic Cycling - - Provides technical methods for evaluating and estimating cycling performance and parameters.
Bicycle Gearing - - Whole lotta gearing going on. Personal home page of a gearing tekkie. Useful lists, large-scale charts and graphs and good explanations.
Bike Think - - Gary Houchin-Miller shares his thoughts on technical topics which examine the fundamentals of bicycle performance. Links to lots of additional information as well.