Measuring Device

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

The Bottom Bracket Gauge Tool was designed to provide all the necessary measurements to identify the proper bottom bracket for a specific bike configuration
The gauge can measure bottom bracket width, bottom bracket shell inner diameter, crank spindle length, crank spindle diameter and bearing inner diameter
A metric scale runs along the long edges for measuring bottom bracket shell width and crank spindle lengths
Durable red anodized aluminum with laser etching
Overall size 7` x 3` x 0.125`

Quick, accurate tool for determining the inside diameter of a bike???s seat tube taking the guesswork out of ordering a replacement
Made from durable acrylic, this gauge is built to last and sized just right for shop benches, toolboxes, and trailhead tool kits
Covers 24 common seatpost sizes, from 25mm up to 34.9mm, including all the in-between sizes you???re likely to encounter
Compact, lightweight, and easy to use