How do you measure the speed of a chain?

Formula for Chain Speed Calculation Take chain pitch and multiply x two. Multiply above number by number of teeth on sprocket of saw. Multiply that number by saw RPM. The number you get will be chain speed in inches per minute. To convert to feet divide by 12. To convert to feet per second divide by 720. Click to see full answer. In this regard, how is chain wear measured?Using a ruler, a new chain should measure exactly 12 inches across 12 links, from middle of pin to middle of pin. The number most commonly agreed on for a worn chain is one percent elongation between links. In reality though, you want to replace the chain before this point.Additionally, how do I know my bike chain size? L = 2 (C) + (F/4 + R/4 + 1) L = Length – your chain length in inches (rounded to the nearest inch). C = Chain stay – the distance between the middle of the crank to the rear axle. F = Front chainring – The number of teeth on the largest (front) chainring. R = Rear cog – The number of teeth on largest rear cog. Keeping this in view, what speed chain do I need? 4 Answers. If you are using a bike with a derailleur the number of cogs on the rear hub will determine the chain size you will need. They are always 3/32″ chains. You can get a 5/6/7-speed, 8-speed, 9-speed, or 10-speed chains.How often should you change your chain?To avoid this accelerated wear of your cassette and chainrings, a general rule of thumb is to replace your bike’s chain every 2,000 miles.