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@WestCoastRider
I have developed an Android app in large part inspired by this and similar threads, and trying to make comparisons between all these different configurations, works out the gear inches for a given combination of chainring and sprocket and then gives nearest equivalent configurations, useful when planning a fixed gear conversion or just fun in a nerdy kind of way - its on Google Play - called (originally) Singlespeed Gear Ratio App - it's cheap and I like it! Have fun and feedback welcome.