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Hit 1000 spoke tension readings in one week, learned my Park gauge was off
I was building wheels for three customers last month and got into a rhythm. After about the 800th spoke reading I noticed my numbers were way lower than usual. Checked with a friend's digital gauge and my Park spoke tension meter was reading 15% low. I had been undertensioning every wheel for who knows how long. Has anyone else caught their gauge drifting without realizing it?
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hernandez.gavin16d ago
Ask you this - did the undertensioning change the spoke windup pattern or the way the nipples seated? I noticed when my gauge went off it took me a while to figure out why I was suddenly getting more nipple creep during the first few rides. The wheels came back for retensioning way more often than normal. Was there any sign like that on your builds or did everything seem fine until you checked the numbers?
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william_craig716d ago
Yeah, but nobody's talking about what happens when undertension messes with the spoke bed. If the spokes aren't pulling evenly on the rim, the rim can start to deform slightly at the spoke holes. Over time that creates little stress risers that can lead to cracks, especially on alloy rims. @hernandez.gavin I saw the same nipple creep you did, but what really tipped me off was the spoke heads starting to sit crooked in the flange holes. That's a dead giveaway the tension wasn't high enough to lock everything in place. A 15% drop changes the whole loading pattern on the rim edge, not just the spoke itself. Once the rim starts to relax into a different shape, you're chasing problems that retensioning alone won't fix.
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15% is noticeable but honestly, with spoke tension, minor differences like that usually don't cause real problems unless you're way off. I've been building wheels for around 6 years and my old cheap gauge was probably 20% off half the time. Wheels still held up fine for normal riding. If you're building for hardcore mountain bike or track use, yeah be more careful, but for your average road wheels, a little undertension won't cause instant failure.
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