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After truing my front wheel, it seems that it is laterally true. However, the spoke tension seem very uneven, with a few spokes that are very taut next to other spokes which are more loose. If it was a small difference, I wouldn't be too concern, but it seems a bit too big of a difference in tension that has me worried.

I have access to a tension meter and a pro-grade truing stand.

How should I fix this?

Should I loosen all the spokes and start from scratch or fine tune the existing setup?

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3 Answers 3

up vote 5 down vote accepted

For reference, I used to work for Velomax Wheels, and Easton Wheels.

You may want to back all of the spokes off an equal amount, say 5 or 10 turns. This will give you a little bit of room for adjustment, without having to completely detention the entire wheel.

There is a book called "the Bicycle Wheel", by Jobst Brandt, that does a great job of walking you through the process of truing.

Another way to tell if the spokes are of equal tension is to pluck them like guitar strings. Since they are all of the same length and same thickness, equal tone means equal tension. (We used to attach an electronic "pick up" to our truing stands, and wear headphones so we could better hear the differences when we plucked the spokes. This shouldn't be necessary say, in your garage where there is a lot less ambient noise.)

A couple tips for truing (though you may know these already): - Be sure to back off any adjustment that you make on a singular nipple. This will eliminate any possible spoke 'wind-up" caused by the twisting of the nipple. (example - if you want to make a 1/4 turn adjustment, turn the nipple a 1/2 turn and then back off 1/4.) - Be sure to give adjacent spokes a soft squeeze to help the spokes and nipples settle. - check for cracked nipples and cracks at or near holes in rims.

Once it is true, then you can bring all spokes back up to tension (the 5 or 10 turns that you originally made.)

Truing stands are very helpful in holding the wheel in the right position to make your adjustments. (Rather than trying to do it in your hands or in the bicycle frame/fork.) they also typically have a measurement pin or finger that helps show where (and to what degree) the wheel is out of true.

Tensiometers are okay devices. Here are a couple of their downfalls: 1-no two are the same and they come out of calibration quite easily. 2-several factors, such as how you hold the tensio on the spoke and where you place the tensio on the spoke, influence the gauge reading.

Hope this helps.

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FWIW: I do have a copy of the bicycle wheel. I think it's a great reference. Still working on getting a better "feel" for the process and handling those situations for which I have to read between the lines. –  Benzo Aug 9 '12 at 18:59
    
Do i actually care what the tension is exactly if my tension meter is out of calibration? Isn't the most important part here the relative tension versus other spokes? –  Benzo Jun 17 at 14:11

The way I approach this is to equalize the tension by sound (my ear is terrible so I use an app for the iPhone called Spoke Tension Meter). I start by picking an average tension and adjusting all of the spokes towards that tension. That usually throws the wheel out of true. Then I go around retruing the wheel checking tensions as I go – aiming for a true wheel with relatively even tensions.

Regarding the question above about the actual tension vs having balanced tensions, what matters most if the balance – that is what creates a stable structure. The actual tension value seems to be a ±10 or even ±20 percent thing (based on the specs of good tensiometers and a post Park's site called Wheel Tension Measurement). Based on my limited experience with the iPhone app you can match tensions very closely (±1 count).

If you are not sure about the calibration of your tensiometer I would think that you could get close to a decent number by having someone of similar weight to the user of the wheel sit on the bike with the wheel mounted. This will load the wheel and you can check spoke tension under load. You don't want to see a change in tension.

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If the adjacent spokes with different tension are on the same side of the wheel, then you could, to a certain amount, release the tension from the tight one and tighten the loose one.

If they are each on one side of the wheel, you could not even the tesion without untruing the wheel, and that means your rim is not intrinsically true.

If the rim is not intrinsically true (that is, it would not look true if the spokes are removed), you could try to "bend" the rim in place this way:

  1. Make spoke tension be equal on every spoke;
  2. With an inflated tire, hit the out-of center parts or the TIRE against, say, a tree, while grabbing THE TIRE with your hands.

Although it seems too violent, it has worked as magic with my acquaintances (who sometimes bend their wheels falling during rides). Hopefully, though, the problem is just uneven tension in spokes on the same side of the wheel, so this beating would not be necessary.

Hope this helps!

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