Park Tool spoke tension meter TM-1

The TM-1 Tension Meter accurately and reliably measures the absolute tension of each of the spokes in a wheel, as well as the relative tension between all the spokes in a wheel. Easy to use and priced affordably, the TM-1 works on nearly any bicycle spoke - no matter what the diameter, material, or shape. The TM-1 is for anyone building or truing wheels, diagnosing wheel problems, or assembling new bikes. It’s a tool that belongs on every workbench.

Note: The TM-1 Tension Meter includes a printed table to convert tension reading to kilograms force. Because of new and varied steel bladed aerodynamic spokes, there is a web page that acts as a chart calculator for steel bladed spokes not on the table.

Useful TM-1 Online Aids:

• The Wheel Tension Balance Web App (www.parktool.com/wtb) converts readings from the TM-1 into kilograms force values (kfg) and then produces a visual diagram of the relative spoke tension in the wheel.
• The Steel Bladed Spoke Calculator (www.parktool.com/tm-1-tension-calculator) converts TM-1 readings to kfg specifically for a wide variety of newer bladed steel spokes.