Lacing disc brake rear wheel: Always lace trailing spokes first?
05-21-10, 11:17 PM
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Lacing disc brake rear wheel: Always lace trailing spokes first?
I tried to be smart while building up a disc brake rear wheel. It's 32-spoke*3-cross, using a Sun Equalizer 23 rim on a Shimano XT hub (FH-M775). I followed Shimano's lacing instructions, meaning that the drive-side trailing spokes are head-in, while the non-drive-side trailing spokes are head-out. I think my problem might be that I laced up all of the head-out spokes first, instead of following Sheldon's instructions (drive-side trailing spokes first, then non-drive-side trailing spokes second). My intent was to do the head-in spokes last, allowing me to avoid bending the spokes too much.
The problem is that all of the head-out spokes appear to be too short, on both the drive and and non-drive side. Conversely, the head-in spokes are too long. I didn't have this problem when I built using the same model hub on another rim, laced in the same way but in a different order (both side's trailing spokes first). I noticed that doing leading spokes on one side then trailing spokes on the other made it rather difficult to put the nipples on the last few spokes. Did I mess up the lacing order?
The problem is that all of the head-out spokes appear to be too short, on both the drive and and non-drive side. Conversely, the head-in spokes are too long. I didn't have this problem when I built using the same model hub on another rim, laced in the same way but in a different order (both side's trailing spokes first). I noticed that doing leading spokes on one side then trailing spokes on the other made it rather difficult to put the nipples on the last few spokes. Did I mess up the lacing order?
05-22-10, 12:37 AM
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I think you might have an incorrect cross number, or you're one hole off on one side.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
05-22-10, 02:40 AM
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I solved the problem by relacing the correct way. I think my error was in setting up a situation where one side's trailing spokes balanced out the other side's leading spokes. So when the wheel was halfway done, it was already taut. Sort of like that thread where a fellow asked about building a wheel with all-leading spokes on one side and all-trailing on the other. Tightening the second set of spokes on each side wasn't doing much to the rim, probably because the first set was in equilibrium and counteracting the change in spoke tension. So to sum up, lace the trailing spokes first!
