DirtJapan.com

gear ratio calculator for bicycle.
- compare gear ratio between before and after it changed.
- calculate cadence and speed.
- MTB/Roadracer/tourer/pistbike available.

Select current gear in top list. or input all teethes, and push [Calculate]. You will see your gear as green-background.
Select gear you will change from change list. You'll see it as pink background
if you select cadence(rpm) in [ratio/speed] list, you'll see speed in cadence.
You can examine new sprocket, compact-drive, triple-gear, and others, befere you buy it.
for car/motorcycle is here.
Japanese version is here.
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chainwheele caset sprocket select tire
outer middle inner
1s 2s 3s 4s 5s 6s 7s 8s 9s 10s
tire peripheral .digit mile/km Y axis


          


change chainwheele change caset sprocket ratio/speed graphsize
you will see gear ratio. if you select cadence, you will see speed.