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Rear Wheel Dish

aktallguy

Monkey
Aug 31, 2006
117
0
Puget Sound, WA
I've now built my 3rd wheelset. The first two came out really well. I've been riding them for over 2 years now with out any huge problems. I built my 3rd set 6 weeks ago and the rear wheel dish is off by 3/16th in to the left. I've got the drive side spokes tightened way down and the non-drive spokes seem very loose but the wheel just won't come over. The LBS confirmed the spoke lengths; I even called another LBS and got the same lenghts. Any tricks or common mistakes? the rims are symmetrically drilled as far as I can tell.
 

BikeMike

Monkey
Feb 24, 2006
784
0
So you've gone around the entire wheel, doing 1/2 (or whatever fraction you want) a turn tighter on one spoke, exact same amount looser on the next and it doesn't impact the dish?

Sounds like a strange problem indeed.
 

aktallguy

Monkey
Aug 31, 2006
117
0
Puget Sound, WA
That's what I'm thinking the drive side spokes are getting awfully hard to tighten. I'm thinking 2mm shorter? All the threads are hidden on the spokes. I'm going to try loosening the entire wheel and tightening the drive side more than the non-drive side as I go around.

- Update: I've got the dish side tight enough that I'm going to start stripping nipples if I go another 1/2 to full turn. The non-drive side is snug, but looser than my other wheel sets. I can get my 2.3's in without rubbing the frame, but the centerline of the wheel and the centerline of the frame are off by 2.5 mm. So I'm going to stick with 2.2 tires for the time being. I did build the wheelsets from used parts I got at a Recycled Cycles so I"m not really out any cash. Just seems odd that things aren't working out. I'm wondering if the spokes I got were perhaps pulled from the wrong bin at the shop?
 

sanjuro

Tube Smuggler
Sep 13, 2004
17,373
0
SF
I'm wondering if the spokes I got were perhaps pulled from the wrong bin at the shop?
Very possible. Whenever I build a wheel, I measure at least one spoke from the bunch and make sure the rest are equal in height.
 

skiplie

Chimp
Sep 27, 2006
63
0
did you use a dishing tool to measure how far it is dished out? It may be correct, but the frame has geometry that puts the wheel to the left a little bit
 

chrldrcar

Chimp
Sep 25, 2007
3
0
Middletown, CT
Most of the bike shops use the same spoke length calculators so you will get the same results from the shops. They are not always right. A number of times I used the calculator and it was wrong. 2mm isn't much but it is enough to make the difference.

If it works now, run it.