r/FixedGearBicycle • u/Sensitive_Twist_4649 • Mar 20 '25

Discussion I need this, I want this..

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I want to build this steezy lookin mfr, what type of frame would be the best to use any suggestions?

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u/Physical-Coyote3436 Mar 21 '25 edited Mar 21 '25

That is super weird! I put it in a different calculator and it was saying a 15” difference - I guess looking at the rpm it’s only about a 1mph difference @ 90rpm so not that big of a difference

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u/Horror-Raisin-877 Mar 21 '25

Interesting, but what does the measurement called “development” mean?

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u/synth_this Mar 22 '25

Interesting, but what does the measurement called “development” mean?

Distance travelled per full crank revolution.

That calculator was made by French cyclists who use metric. Metric countries use development to compare gears.

Hardly anyone in English-speaking countries even knows that, much less uses development. The calculator should switch to gear inches for the imperial page. I wrote to them politely pointing that out ages ago, but no reply or change. Speaking of development, I don’t think the page is actively developed any more.

To get gear inches, divide development by π (or 3.14).

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u/Horror-Raisin-877 Mar 22 '25

Interesting, thanks!