Trouble with Wheel Build
So I'm trying to build my first wheelset, but I am having a bit of trouble. The wheel is cross 3 and is all laced up, but the tension is being weird. I started them all with 2 threads showing on each spoke and tightened each spoke 2.5 full turns in 1/4 turn increments. All of the trailing spokes are at 55-60Kfg, but the leading spokes are all around 0-5Kfg. This is only the front wheel as I haven't started on the rear yet.
Does it sound like I am doing this right or did I make a mistake somehow? I held it up to another 3x wheel and they looked to be laced the same. Any help? I am using Hope Pro II disc hubs and Spank Subrosa rims. Thanks |
sound like you are doing it right,as long you add tension to the wheel everything will be ok. the important thing is to keep the wheel round and straight, no up and down, or left & right bent in the wheel.
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ok well, every other spoke is at final tension. The other half are very loose. The wheel is true. Do I now go around and only tighten every other spoke?
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Show us some pictures of the lacing. If you're off like this it could mean that you're off by one hole in the hub or rim.
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Originally Posted by Glynis27
(Post 7809059)
So I'm trying to build my first wheelset, .... The wheel is cross 3 ..but the tension is being weird. ... All of the trailing spokes are at 55-60Kfg, but the leading spokes are all around 0-5Kfg. ...Does it sound like I am doing this right or did I make a mistake somehow?
I've read about someone claiming that's it's possible to lace a wheel with diff crosses for leading and trailing. I can't envision how that would turn out, so I can't say what you could do to determine whether that's what you've inadvertently done or not. |
And how could 55-60 Kgf be final tension? That sounds way too low.
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If it is a front wheel and you used all the same sized spokes and they all seem to be close to the right length (none are ~2 cm short from reaching the nipple) then you likely have the wheel laced properly. Show a pic and everyone can look and figure out what might be going on.
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Originally Posted by DannoXYZ
(Post 7810241)
Show us some pictures of the lacing. If you're off like this it could mean that you're off by one hole in the hub or rim.
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Originally Posted by wmodavis
(Post 7810407)
And how could 55-60 Kgf be final tension? That sounds way too low.
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I am using 254mm spokes on the disc side and 256mm on the other side. They are what my LBS told me to use.
I turned each spoke 1/4 turn more and then gave each disc side spoke an extra 3/4 turn. http://i25.photobucket.com/albums/c8...oooooookes.jpg The red spokes are all between 72 and 125Kfg. The light blue are 0-30. Same goes for the other side of the wheel. Not sure what final tension I should be shooting for with butted spokes. |
The dish is off by about half an inch right now. I am certain I did not turn any the wrong way or mix up the spokes.
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254 mm spokes on the disc side should all have the same tension ~ 100 kgf and the 256 mm spokes on the other side will all have lower tension, but should be the same as each other.
I can't tell from your description or your picture what is wrong. Can you put the yellow, red, dark blue (or some other easily determined color), and light blue colors on the spokes as per the Sheldon Brown diagrams? http://sheldonbrown.com/wheelbuild.html#definitions |
I also think the picture is hard to tell the crossing pattern due to black spokes on black hub.
I think if you check through the Sheldon Brown method you will find what is up with your wheel. If you used Spocalc, you will also know what ratio to expect for tension differences from disc side to non-disc side spokes. Will getting the centering corrected make the "problem" worse or will it make it better? |
Try taking another picture, this time with the lens on the axis of the skewer. Also, try to avoid those shadows by moving the wheel away from the white background - my eyes go nuts looking at it this way. If you do this, and color code all the spokes, maybe we can help.
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Originally Posted by Glynis27
(Post 7811111)
The dish is off by about half an inch right now. I am certain I did not turn any the wrong way or mix up the spokes.
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Did you remember to cross under for your third cross? Are all the spoke heads seated properly? What happens if you bring the loose spokes up to tension?
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I think it's the green rim that's doing it! :eek:
Seriously, did you double check the spoke lengths yourself, both in a calculator and with a ruler? I relied on a usually very reliable shop where I got my spokes and they had made an error in calculation or spoke selection (they weren't sure which later themselves) and given me the wrong spokes for one side, didn't get as far as you, but it was obviously wrong so took the wheel apart and started over from the beginning and caught the error...shop was embarassed. |
It's hard to see with the wheel so close to the background and the shadows look like another spoke. Can you take another picture close-up of the hub and spoke from the side just like that photo?
Are all of the marked spokes from the same side of the hub? What about the tension-difference on the other side of the hub? |
And somehow stand it up away from walls and stuff that causes shadows of the spokes.
It's hard to say given the shadows and all but something doesn't look quite right to my old myopic eyeballs. Like you're out by a spoke hole or something. It could be the shadows playing tricks with me though. |
Originally Posted by Glynis27
(Post 7811099)
The red spokes are all between 72 and 125Kfg. The light blue are 0-30. Same goes for the other side of the wheel. Not sure what final tension I should be shooting for with butted spokes.
I'd recommend starting over and paying more attention to keeping the wheel dished properly as you bring up the tension. Basically, start paying attention to the dish early on so that you don't end up with such tight spokes on the non-disc side. Hopefully the end result with be much more even tension. |
It appears from his photo and comments that the variations in tension are for spokes on the same side of the hub???
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If you look at (one side of) the hub, how many spokes are there between the spokes that run almost parallell to each other to the rim, and then attaches to the rim with one spoke hole inbetween?
Is one of those paired spokes heads-in and the other heads-out? |
Starting to look a bunch better. Dish is only 2mm off now, disc side spokes are all at 115-125Kfg and non-disc side is all at 65-80Kfg. Wheel is true in all directions.
What type of tension should I be bringing the non-disc side up to? |
What's the rim's max tension? The disc side should be pretty close to that, and the non-disc side whatever tension you need to get the dish correct.
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If it's in true, just get it dished level. At 115 - 125 Kgf, you don't want to keep spiraling upwards. That's plenty of tension on that side. Yow!
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