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Bike size/fit calculator tool?

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  • July 24, 2018 at 1:31 pm #28760
    alex1987

    Hi there, starting to window shop for a possible (nearish) future upgrade to my bike and been looking for a tool I haven;t yet been able to find.

    I have had a good and effective bike fit on my current bike and hold all the relevant measurements about it and would love to be able to quickly put them against the frame geometries available for different models of bikes in order to see what stem/saddle setback/exposed saddle post etc would be needed and, of course, whether my current position is at all replicable on the model/size I might be looking for.

    I know of course some maths will go a long way to give me these answers but if somebody had already build a little calculator for this it would be a nice quick way to start narrowing down choices!

    Many thanks in advance,

    Alex

     

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  • April 27, 2026 at 11:33 am #1197899
    0
    gobike

    I second the vote for BikeGeoCalc. It is the only tool that really helps visualize how stem angle and spacer stack affect the final reach.

    I actually use it to double-check numbers when we are designing frames for our junior electric range over at GoBike Australia https://gobike.au. You would be surprised, but even on 16-inch wheels, if the effective top tube is off by just 10mm, the whole handling balance falls apart.

    Definitely worth the time to input your current fit data there before buying.

    October 1, 2025 at 8:42 am #1156657
    0
    kitlazy

    Best bikefitt aplication and

    Best bikefitt aplication and bike calculator: http://www.fizmoo.com

    https://road.cc/wp-content/uploads/roadcc/Zrzut ekranu 2025-10-01 065056.png

    July 27, 2018 at 2:12 pm #924035
    0
    alex1987

    Many thanks for the links,

    Many thanks for the links, very useful indeed! Appreciated

    July 25, 2018 at 9:12 am #924033
    0
    kil0ran

    https://geometrygeeks.bike/

    https://geometrygeeks.bike/

    or

    http://www.bikegeo.net/

    (the latter is really good for visualising different setups and is stem-aware)

    If you really want to get detailed then this might be worth the effort

    https://www.bikegeocalc.com/

    because you can input your fit data as well as bike geo data

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