Park tools spoke tension

And therefore such high precision tools must be calibrated from time to time. Blindly following what your tension meter tells you can be misleading.

Readings become unreliable, commonly indicating higher spoke tension compared to the actual number, therefore misleading a wheelbuilder to finish a wheel with spoke tension that will be lower than expected. TIP: once in a while, calibrate your tension meter to assure tension readings corresponds with numerical values of actual spoke tension.

Based on its original spoke tension chart, that was included with the device, it showed on average 10 to 15 kgF lower spoke tension on spokes compared to what tension really was for that spoke tension reading on a scale.

When I found out, which was obviously too late, my alarms went off. Some of my latest wheelsets were handled to customers with lower spoke tension than desired. From then on, I barely fine-tuned it again. The mechanical design of Park Tool TM-1 spoke tension meter is quite simple.

Adjusting the spring preload will determine how your tension meter works. When this spring wears, the deflection of a spoke will be smaller and your spoke tension - based on your TM-1's scale will be higher. Unless you check it with a tension meter calibration tool and find out differently! To calibrate Park Tool TM-1, just unwind spring tension setting screw on the back side of a tool accordingly.

In my newly relesed App SpokeCalc, a total wheelbuilding tool a user can create and store spoke tension conversion charts for multiple spokes and across multiple tension meters. Write down tension meter readings for reference tension values and periodically check if your tension meter is still precise.

Round, bladed, classic or straight pull spokes supported. In that way, all your spoke tension charts are always available to you online and ready to be modified in the process of spoke tension meter calibration.

The app will also track the date of when you last modified your file, which can be useful to remind you when a new spoke tension calibration process is necessary! Calibration should be a regular maintenance of your spoke tension meter. Better to have an accurate and perfectly calibrated basic tension meter like TM-1 rather than blindly trusting an expensive tension meter with a precision dial indicator and using it in a careless way by not taking any maintenance of it.

Every now or then you should simply check if your readings match with the actual spoke tension. Make a specific conversion table for the spoke models you use.

No need to test your tension meter across all the spoke types and dimensions or even in a very wide range of tension. Rather than that, just focus on the spoke tension values you will be using. As a high precision tool, it is absolutely necessary to operate with it with upmost care and store it safely when finished with work. Most of inconsistencies in readings can be a result of poor handling and operation with the tool itself. Talking about operation with the tension meter, again, your motion when decompressing tension meter to measure deflection of a spoke should be consistent across all the spokes.

And lastly, mimic the position of a spoke in a spoke tension calibration tool to the one on your wheel. I have noticed that I get slightly different readings if my calibration device is positioned horizontally than if I position it vertically. Tension on the spoke itself is still the same, yes, but you are distorting a reading with tension meter slightly leaning on a spoke itself.

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Make an offer:. Stock photo. Brand new: Lowest price The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. For steel spokes not found on the printed table, you can generate custom conversion tables using the Wheel Tension App Available from Park Tool. The app also provides an interactive tool to help visualize and analyze relative spoke tension.

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