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Thread: Radial Truing

  1. #1
    I am Noobert.
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    Radial Truing

    First off, I did use the search. *Clears Voice*

    I took an old 27'' wheel and did a singlespeed conversion on it today, axle-respace, some dishing.
    I got it nearly perfectly laterally trued, but the wheel has some radial troubles.

    Any suggustions on radial truing with out a stand?
    Can a 1 1/4'' junk tire be deceiving to the wobble of the wheel?

    I wish I had a stand.

  2. #2
    A little North of Hell
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    take the tire off.
    [SIGPIC][/SIGPIC]
    XXXI

  3. #3
    Great State of Varmint Panthers007's Avatar
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    Always make radial-adjustments with a pair of spokes. This way it shouldn't effect your lateral true.
    How do you keep an idiot in suspense?

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    I am Noobert.
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    By pair u mean two that are crossed? or one from each side of hub?

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    Great State of Varmint Panthers007's Avatar
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    One on each side of the hub/rim. If you tighten one on the right side 1/4 turn, do the same to the spoke opposite it on the left side. If you tighten one spoke only, it will pull the rim in that direction and your wheel will go out of true side-to-side (lateral-truing). So tighten both sides.

    Think about it visually. And read this:

    http://sheldonbrown.com/wheels/index.html
    How do you keep an idiot in suspense?

  6. #6
    I am Noobert.
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    Thanks. Theres a bike shop a couple blocks from my house, but they are really arrogant. They do not like answering questions.

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    I am Noobert.
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    Should I allign a zip tie above the rim?

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    Subjectively Insane MilitantPotato's Avatar
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    Tape a tire lever or something that's straight to the chainstay. A big ziptie would work, might damage the paint if it moves around.

  9. #9
    I am Noobert.
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    Will the straight object be fixed in one position? move torward, or away from it? Just takes expierence I guess.

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    Senior Member badmother's Avatar
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    Search for hommade truingstands. Plenty of them made from old forks and other stuff. Great help plus you do not worry about paint.
    °Empty drums make a lot of noice... (Old Hungarian proverb).

  11. #11
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    A zip tie attached to the stays won't cause a problem...

    In my (commercial) shop I use a diy stand made with an old fork and it uses zip ties and a dial indicator for really fine tuning.

    It has served me well for many many years.

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    Take the tire off.

    You can take some tape or something, and go across the chainstays, and visually measure from it to see how much radial runout you have. I use a magnet, so I can adjust it easily.

    From there, it is just a question of patience. As Panthers pointed out, always adjust adjacent spoke pairs and you will not throw off the lateral too much, drive and non-drive side is the pair. Not crossed spokes, You will have to go back and check it as a last step.

    FYI, it can be hard to bring an old steel 27 in, because they can be bent and have low spots that can't be removed with truing. There are tools made for pulling the flat spot back out, but I don't know if you can find a bike shop which still has one. Seems most shops want to just sell bikes these days, and offer limited repairs on the side.

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    If radial truing causes uneven spoke tension it probably means that the rim is bent and needs to be corrected or replaced. You can't do a good job of radial truing with the tire on.

    Al

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    I am Noobert.
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    Can rims be bent in the radial aspecT?

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    Reeks of aged cotton duck Hydrated's Avatar
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    Quote Originally Posted by Noobert View Post
    Can rims be bent in the radial aspecT?
    Absolutely. Hitting a nice rock, pothole, or curb at warp speed will do it.
    It is the mark of an educated mind to be able to entertain a thought without accepting it.-Aristotle

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    I am so Angry right now. Its a singlewalled old weinmann rim. I feel like the rim is bent. But Ill never know untill I cut out all the spokes and lay it flat on the ground. Makes me feel like Im a failure at truing wheels. And all my hopes and dreams in wheel building are collasping. God-darnit. And the fact that I don't have a truing stand isn't helping.

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    Quote Originally Posted by Noobert View Post
    I am so Angry right now. Its a singlewalled old weinmann rim. I feel like the rim is bent. But Ill never know untill I cut out all the spokes and lay it flat on the ground. Makes me feel like Im a failure at truing wheels. And all my hopes and dreams in wheel building are collasping. God-darnit. And the fact that I don't have a truing stand isn't helping.
    See if your LBS has the capability to straighten the wheel, if it is actually bent.

    They would need something like this.

    http://www.biketoolsetc.com/index.cg...item_id=CU-030
    Attached Images Attached Images
    Last edited by dahoyle; 08-12-09 at 04:18 PM.

  18. #18
    I am Noobert.
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    Dont rims get bent just by riding them?

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    As a general rule, it would require some sort of elevated force to actually bend one beyond it's yield point. (the point at which it deforms and doesn't return back to it;s original shape)

  20. #20
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    When the bike is flipped up side down, and I spin the wheel, the whole bike starts to shake. But appears to be latterally intrue, and today I tried to radial. What ever. Maybe its just a junk wheel? with a crap tire?

  21. #21
    Reeks of aged cotton duck Hydrated's Avatar
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    Quote Originally Posted by Noobert View Post
    When the bike is flipped up side down, and I spin the wheel, the whole bike starts to shake. But appears to be latterally intrue, and today I tried to radial. What ever. Maybe its just a junk wheel? with a crap tire?
    Take the tire off. You may be going to a lot of trouble and worry trying to troubleshoot a rim problem that's actually a tire problem.
    It is the mark of an educated mind to be able to entertain a thought without accepting it.-Aristotle

  22. #22
    I am Noobert.
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    I took the tire off, and tapes the tire lever on, When the rim rubbed I Tightened the spokes by pairs.

    Wheel Truing takes time to learn? Im 21 years old. Im just kind of angry that Ive still gotta pay people to true my wheels.

    Im still going to take up wheel building, and not let it get me downl.

    Bottom Line, Would you say that it takes time, and takes a good time to master? Or do some people just not have what it takeS?

    Having a mechanic-mentor would help.

    Also: If its radially un-true will that cause the bike to shake, when upside down? THank you for helping me guys.
    Last edited by Noobert; 08-12-09 at 06:13 PM.

  23. #23
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    Quote Originally Posted by Noobert View Post

    Also: If its radially un-true will that cause the bike to shake, when upside down?
    Maybe but it's more likely related to an out of balance tire/wheel combination. Some shaking is not necessarily a bad sign on a bike tire when spinning freely. Good balance is not so critical on a bike.

    If you want to try to straighten the rim take the wheel apart. Use a rubber mallet and some wood blocks to re-shape the rim. Re-build the wheel using the same spokes and nipples. It's really not so hard to do. But don't expect the rim to be perfect. It needs to be close enough that the spoke tension is close to equal, or close to equal on either side if the wheel is a rear dished for a cog set.

    Steel rims are good for practicing your building techniques, not so good for riding.

    Al

  24. #24
    Senior Member vredstein's Avatar
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    Follow through with your intention to learn wheel building, and you'll learn more about truing than is ever possible through just "tweaking" existing wheels.
    "See, it's not that getting wet is a big deal. Really, it's what you're getting wet with.
    Fenders....because it's probably urine."
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  25. #25
    Great State of Varmint Panthers007's Avatar
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    Quote Originally Posted by vredstein View Post
    Follow through with your intention to learn wheel building, and you'll learn more about truing than is ever possible through just "tweaking" existing wheels.
    +3

    That is, without a doubt, the best road to take. Then truing can be done without much thought or fear.
    How do you keep an idiot in suspense?

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