The most common threading issue seen in bike shops comes from improper pedal installation. This is due to the left hand threads found on the non-drive crankarm, which prevent the pedal from un-threading as the crank is spun through each revolution. The right side crank arm has standard right hand threading. The Park Tool TAP-6 pair of crankarm thread taps fits the 9/16 pedal axle standard, and delivers the proper right and left side thread taps. This size is the most commonly used in cycling, on all but lower-end cranksets found on children's bikes.

Threads are often damaged from an installer attempting to install a pedal on the opposite side, not realizing that both pedals and crankarms feature the right/left specific threading. Park makes the TAP-6 from hardened carbon tool steel, with sharp, precise thread cutters for each side, which both feature the same thread size 9/16" x 20 TPI, but the specific right/left application. The TAP-6 is properly used with a standard tap handle, and the TAP-6 works with Park's TH-2 tap handle.