I have this bike: http://www.trekbikes.com/int/en/bikes/mountain/cross_country/superfly/superfly_9_8/
Frame Size is 17.5 Crank is: Shimano Deore XT, 38/24
I purchased a garmin edge. It asks for Crank length for the cadence business.
How do I get my crank length? Should I get out a tape and measure it?