Here’s a handy list of useful websites with technical calculators that I regularly use for bike maintenance and setup — they make tasks like wheel building, gear inch and cassette calculations, tyre pressure estimation, suspension sag and fork/crown compatibility much faster and more accurate, and often include unit conversion tools and printable charts; whether you’re truing wheels, setting chain length, calculating spoke lengths, checking frame geometry or comparing tyre volumes, these online calculators save time and reduce guesswork, so I keep them in my favourites for quick reference during tune-ups and safety checks.

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When buying a new bike or upgrading an old one the gear calculator can help to find the optimal gearing for it. The gear calculator displays graphically the speed and development (either in gear inches or in meters) for all gears of a given gearing system, either with derailleurs or with hub gears.cription text goes here
This calculator is estimating the fastest possible pressure based on real world data taken with professional athletes riding professionally specified and maintained equipment.
Welcome to the world's biggest open database of bike geometry.
The calculator uses a CAD based model using vector algebra with algorithms designed to cope with some very complex lacing patterns. It uses elongation equations to calculate very accurate spoke lengths which is important if you are using thin stretchy spokes such as Sapim Laser, Sapim CX-Ray and DT Revolution.
Lots of useful information about waxed versus lubricated chains, lubricants, electric mini pump testing and an online store
The Wheel Tension App is a web-based tool for use with the Park Tool TM-1 Spoke Tension Meter. It was created in collaboration with Dr. Julie Howat and Dr. Colin S. Howat.
A comprehensive suite of calculators for gear ratios, gear inches, skid patches (for fixed-gear riders), and cadence-to-speed conversions.
One of the oldest and most respected performance models. It allows riders to input weight, grade, and power to predict speed, or vice versa—factoring in wind resistance and tire types.
Offers professional-grade calculators for bike fit, gear ratio optimisation, and weight savings analysis.