Chuck Liu wrote:
> I recently brought a Park tool Tensiometer. I checked the spoke tensions on my Rolf Sestrieres and
> found out that the tensions were all over the place... After playing with the front wheel for
> hours, I still couldn't get each spokes to have even tension AND roundness! How much spoke tension
> should be on the front wheel? ....the non-drive side rear? ....the drive side rear?
>
> Any help is appreciated! Currently, I tried to get the tension of the front spokes to about "15."
> (these are revolution spokes). Is this too high/low a tension?
>
> Help! anybody? These are the total pair of wheels that I have currently and I need them for a
> Sunday century. I guess I will be tweaking the rear wheel the whole day tomorrow
>
>
I don't specifically know the Rolf wheels. You didn't specify the units of the device.
BUT, that aside, I build my wheels to about 100-120 kg on the inset side (disc on the front, free
hub on the rear) and whatever is needed for the rim to be centered on the other side -- usually
about 70-80 kg.
Your problem is probably one of experience. You need to balance the tension across several spokes.
You can't just put all of the spokes at the same tension and have the wheel be perfect -- or machine
built wheels would be great! Rims just aren't that perfect! A 10% variation is typical.
What you need to do is to find the tight spokes by plucking them and listening to the tone. Check
for matching loose spokes nearby. Loosen the tight spoke and tighten the loose spoke to bring the
wheel back in true. Repeat this until the tension is even and the wheel is true. Also check across
the wheel for matching tight spokes on each side that both need to be loosened. If you have a welded
rim, you won't be able to do this around the weld -- just do your best. When you've completed this,
then you'll probably need to bring the whole wheel up to tension. At this point, you can probably
just put a 1/2 or 1/4 turn on each nipple all of the way around and have the wheel stay in true
(check it though
, and you may have to adjust the centering). Also, every so often, take the wheel
off the stand and put hard taco'ing pressure on it to help the spokes seat.
When you're done, put the handle of a screwdriver between the spokes and twist it hard to cross the
spokes harder. This seats the spokes and bends the spokes a little at the crossovers making them
more resistant to breaking.
Some people put a little black dot with a magic marker on each spoke to check for twist. Then, if
the spoke winds-up instead of tightening, you know and can account for it, and take the twist back
out after the adjustment.
Make your adjustments in small increments: 1/4 - 1/2 turn.
When you're building a wheel, you find the high / out of round spot. Check the spoke tension on the
nearby spokes on both sides by plucking them and listening to the tone. Adjust the spoke(s) that
are the most out of tension with their neighbors -- either tighter or looser depending on which way
the wheel needs to move. Towards the end of truing, a spoke 5 spokes away from the out-of-round
spot is the one that pulls it in. Every so often, go all of the way around to check to evenness of
tension (by plucking and listening to the tone) -- and measure a couple to see how close to full
tension you are.
David