Rotating chart for making track related gear calculations simple. Spin the perfect gear ratio on the track or in the streets – reliable accurate gear calculations for (700c wheel) track bikes. Affinity did the math and created a simple easy to use chart which generates 100% accurate calculations unlike inaccurate online calculators. Rotate the chart to choose your chain ring size the window then displays the results of your chain ring & cog gear ratio based on 3 different tire sizes. 19 chain ring variants (47-65t) and 6 cogs (12-17t) for a total of 342 total calculations

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