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Sportster Motorcycle Tires, Wheels, and Brakes Discuss issues with Sportster motorcycle tires, wheels and brakes.

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  #1  
Old 29th May 2020
ThrottleBody ThrottleBody is offline
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Default truing spokes question about centering

I'm replacing the spokes on a nightster and truing the wheel. Never done it before. I've read over Piniongears post, and others, and I've got the radial and lateral runout within specs, now I need to center the rim on the hub.

The manual says "Lay a straightedge edge across the primary hub brake disc mounting face and the rim." Which sounds like I lay the straight edge across the surface that the brake disc mounts against - but in the photo, the straightedge is clearly held agains the lip that stick up from that surface. The diagram below looks like the straightedge is held against the surface, not the lip, but it's hard to tell. Seems like it just about has to be the face not the lip.

I've got two questions.

1. Is this picture wrong?
2. After I get the hub centered, and confirm the radial and lateral runout, do I just need to tap the spokes to check for any that are obviously too tight or loose? I don't have a spoke torque wrench.


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  #2  
Old 31st May 2020
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well, i would have set the depth first when the spokes are not up to tension, easier to move the hub this way. once you have the depth correct, then go around the rim to bring spoke tension up to hold position and then true the wheel. trying to set depth while under truing tension will be a long ordeal.
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Old 31st May 2020
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I found this video when I was preparing to do my rear wheel, maybe there's something here that will help.
https://youtu.be/myxagLY_mDg
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Old 31st May 2020
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The picture is wrong, go by the diagrams.
Later manuals have the picture corrected.
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Old 31st May 2020
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Default

What matters is the rim being centered in the forks, centered between the sliders. That's important. Put the wheel and spacers on the axle in the forks. See if it's centered.

Go around and loosen all the spokes on the close side a quarter turn and tighten the spokes on the side it needs to move towards a quarter turn. Repeat until the rim is centered, then check the rim for runout and adjust as required.

I use a good 4" crescent wrench on spokes and tighten them all "about that much". Tapping the spokes and listening to how they "ping" is just asking for problems.
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Old 1st June 2020
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I’d invest in a torque wrench, no guessing.
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Old 1st June 2020
ThrottleBody ThrottleBody is offline
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Quote:
Originally Posted by decman View Post
The picture is wrong, go by the diagrams.
Later manuals have the picture corrected.
Thanks decman, that's exactly the answer I needed.

And thanks Tomcat, that also clears that up. I have a small regular torque wrench, and a spoke wrench, so I have a pretty good idea of "just about that much." Works better for me than listening to the pings anyway. And thanks for the info. on centering the wheel between the forks.

I already invested in a wheel stand and spoke wrench, so I'd prefer not to invest in a spoke torque wrench unless I do this again, which I may never do. I might also take them and have someone check them once I'm done, for peace of mind. Might be a better investment than the torque wrench, in this case.
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Old 1st June 2020
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Quote:
Originally Posted by RDHenley View Post
I found this video when I was preparing to do my rear wheel, maybe there's something here that will help.
https://youtu.be/myxagLY_mDg
The best video I found on lacing and truing by quite a bit, but I couldn't tell for sure about the measurement for centering the rim.
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Old 1st June 2020
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there are probably millions of re-lace rims out there that never saw a torque wrench. i do not use one. you can tell if a spoke has enough tension by ringing it, besides, the spokes WILL NEVER BE OF THE SAME TENSION!!!
spoke tension is dynamic, changes with forces when in use, if they did not flex, they would break.
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