Advertise on Bikeforums.net



User Tag List

Results 1 to 19 of 19
  1. #1
    Constant tinkerer FastJake's Avatar
    Join Date
    May 2010
    Location
    Madison, Wisconsin
    Posts
    6,018
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    How to tell if a rim can be re-used before lacing it up?

    Bought a wheel for $10. Araya CTL-370 rim laced to a Suntour GPX hub. I know the spoke tension is way off, and some of the spokes have suffered bends. I would like to dismantle this wheel and lace up the rim to a Shimano cassette hub and make a "nice" wheel for myself. But right now, there is a subtle flat spot that I can feel while riding. I'm not sure if this is a result of the bad spoke tension or if the rim is damaged.

    Right now I'm using it as a beater SS wheel. So before I tear it apart and leave myself with nothing, will the rim straighten out when I rebuild it with a new hub and spokes? Or should I just keep riding the thing until it dies and buy myself a new rim?
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  2. #2
    7-speed doomsday prepper ThermionicScott's Avatar
    Join Date
    Aug 2011
    Location
    CID
    My Bikes
    1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX
    Posts
    7,556
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    I'd probably unlace it and see if it's straight without tension. If it is, you have a good chance of a straight wheel when you build it up. Might as well reuse it if there's enough meat in the sides.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,788
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    +1 on Scott's suggestion. Unlace it and lay the rim on a flat surface. If it lays flat or can be made flat with out serious effort and there are no major dings or kinks, you can likely reuse it successfully.

  4. #4
    Senior Member Homebrew01's Avatar
    Join Date
    Jul 2004
    Location
    Ffld Cnty Connecticut
    My Bikes
    Old Steelies I made, Old Cannondales
    Posts
    14,429
    Mentioned
    5 Post(s)
    Tagged
    1 Thread(s)
    And perhaps you can lay it next to a know good rim to try to identify the flat spot, if it still exists after unlacing.
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  5. #5
    Senior Member
    Join Date
    Sep 2010
    Posts
    2,459
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Homebrew01 View Post
    And perhaps you can lay it next to a know good rim to try to identify the flat spot, if it still exists after unlacing.
    Or roll the rim on a flat surface. If it still has a flat spot when unlaced, the spokes in that area will necessarily be under-tensioned relative to the rest of the wheel if you make the wheel round. Difficult to quantify but that area will be more prone to breaking spokes than the rest of the wheel.

  6. #6
    Constant tinkerer FastJake's Avatar
    Join Date
    May 2010
    Location
    Madison, Wisconsin
    Posts
    6,018
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Nevermind, I found the flat spot and after a closer examination there is a matching ding on both sides of the rim. Ugh, oh well.

    Thanks for the advice everyone. I will keep it in mind for future wheels..
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  7. #7
    7-speed doomsday prepper ThermionicScott's Avatar
    Join Date
    Aug 2011
    Location
    CID
    My Bikes
    1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX
    Posts
    7,556
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Seems like somebody on BF had made a jig to hold a rim stationary and press/pull on high/low spots to bend them back into true... can't find it now, of course.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

  8. #8
    Mister Bleak! mconlonx's Avatar
    Join Date
    Jun 2007
    Posts
    4,689
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    I'm a snob: if I'm going to put the time into building a wheel, I'll almost always opt for a new rim. Unless the rim is something really, really special.
    Quote Originally Posted by Six jours View Post
    Bottom line: everyone here should listen to Mconlonx... he has it figured out and the rest of you, well, don't.
    I know next to nothing. I am frequently wrong.

  9. #9
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,496
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ThermionicScott View Post
    Seems like somebody on BF had made a jig to hold a rim stationary and press/pull on high/low spots to bend them back into true... can't find it now, of course.
    It's called a door-jamb.

  10. #10
    7-speed doomsday prepper ThermionicScott's Avatar
    Join Date
    Aug 2011
    Location
    CID
    My Bikes
    1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX
    Posts
    7,556
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Here we go... requires the wheel to stay laced-up: http://www.bikeforums.net/showthread...=1#post8810573

    One could ask whether it's worth it to try rebending the old rim, but if you're already planning on a new rim, you won't be out much if it doesn't work.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

  11. #11
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,496
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Also a glass coffee table makes a great jig to measure flatness of rim. Lay it on the coffee table and notice the opposing high and low spots. Grab two opposing high-spots and place the low-spots on the edge of a door-jamb and push. Adjust slowly until rim lays perfectly flat on glass. I've found starting with as true a rim as possible before lacing up results in much stronger wheel with more even tension and less likely to go out of true in the long run. Heck, I've seen brand new rims that needed some bending to lay flat.

  12. #12
    Senior Member gyozadude's Avatar
    Join Date
    Jun 2011
    Location
    Sunnyvale, California
    My Bikes
    Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
    Posts
    1,183
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mconlonx View Post
    I'm a snob: if I'm going to put the time into building a wheel, I'll almost always opt for a new rim. Unless the rim is something really, really special.
    LOL! My labour during my free-time is cheap! I'm sort of the opposite. It takes my only about 30 minutes to assemble a wheel from parts and get to fairly good tension, so I find myself keeping old rims and hubs in stock that others might throw away. So far, I've given away quite a few wheels as replacements, enabling quite a few boys and their families to continue to ride their bikes which would otherwise sit there collecting dust as they could neither afford to replace that bike or have it professionally repaired.
    Yes, I can roll my own potsticker skins!

  13. #13
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    - - - - - - - - - - - - - - http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,514
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DannoXYZ View Post
    Also a glass coffee table makes a great jig to measure flatness of rim. Lay it on the coffee table and notice the opposing high and low spots. Grab two opposing high-spots and place the low-spots on the edge of a door-jamb and push. Adjust slowly until rim lays perfectly flat on glass. I've found starting with as true a rim as possible before lacing up results in much stronger wheel with more even tension and less likely to go out of true in the long run. Heck, I've seen brand new rims that needed some bending to lay flat.
    Same here. I use a window, though

  14. #14
    Member wxflyer's Avatar
    Join Date
    Jun 2006
    Location
    MS Gulf Coast
    My Bikes
    a few classic Ritcheys, a Mt. Tam, and a "modern" Klein mtb ('99)
    Posts
    46
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Don't mean to hijack this thread (if it's still alive) but I have a related question. I know my "new" used rim is flat with no hi/lo spots, but I'm wondering if I should re-use the old spokes from my cracked rim? Any ideas? Thanks...

  15. #15
    Roadkill byte_speed's Avatar
    Join Date
    Sep 2004
    Location
    East Tennessee
    My Bikes
    2002 Lightspeed Classic; 2010 Pedalforce RS
    Posts
    842
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ThermionicScott View Post
    Seems like somebody on BF had made a jig to hold a rim stationary and press/pull on high/low spots to bend them back into true... can't find it now, of course.
    I made a plywood jig and straightened a flat spotted rim with c-clamps once, and it worked well. I don't think I posted about it.

    However, within a few hundred miles the rim seam (very near the flat spot) started showing signs of coming apart.

    Coincidence? Not sure.

  16. #16
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,105
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mconlonx View Post
    I'm a snob: if I'm going to put the time into building a wheel, I'll almost always opt for a new rim. Unless the rim is something really, really special.
    That's me too. Pre-built wheels are so cheap that the only reason that makes sense to me for building your own is to make a wheel that's as good as I am able. That means starting with good parts.

  17. #17
    Senior Member
    Join Date
    Jan 2012
    Location
    Spokane, WA
    My Bikes
    Specialized Sequoia Elite/Motobecane Fantom Cross Team Ti/'85 Trek 520
    Posts
    2,223
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by gyozadude View Post
    LOL! My labour during my free-time is cheap! I'm sort of the opposite. It takes my only about 30 minutes to assemble a wheel from parts and get to fairly good tension, so I find myself keeping old rims and hubs in stock that others might throw away. So far, I've given away quite a few wheels as replacements, enabling quite a few boys and their families to continue to ride their bikes which would otherwise sit there collecting dust as they could neither afford to replace that bike or have it professionally repaired.
    Agreed 100 percent! I am always on the look out for cheap used rims that are still perfectly serviceable even if they are perfect at all. I really don't worry about tiny dings or even some small flat spots. I don't ride fast enough to notice a tiny flat spot on a wheel that a perfectionist might notice.

  18. #18
    Senior Member mrrabbit's Avatar
    Join Date
    Dec 2007
    Location
    San Jose, California
    My Bikes
    2001 Tommasini Sintesi w/ Campagnolo Daytona 10 Speed
    Posts
    3,136
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    +1 on Scott's suggestion. Unlace it and lay the rim on a flat surface. If it lays flat or can be made flat with out serious effort and there are no major dings or kinks, you can likely reuse it successfully.
    ...assuming the rim itself hasn't suffered from all-around general fatigue. On rare occasion that'll be why the rim will be left in an undertensioned state. Then again, there'd be tons of obvious sidewall wear to boot if brakes had been used in the past for 30,000-40,000 miles plus over many years plus....

    =8-)
    4000+ wheels built since 1984...

    Disclaimer:

    1. I do not claim to be an expert in bicycle mechanics despite my experience.
    2. I like anyone will comment in other areas.
    3. I do not own the preexisting concepts of DISH and ERD.
    4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
    5. My all time favorite book is:

    Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life

  19. #19
    Senior Member mrrabbit's Avatar
    Join Date
    Dec 2007
    Location
    San Jose, California
    My Bikes
    2001 Tommasini Sintesi w/ Campagnolo Daytona 10 Speed
    Posts
    3,136
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by wxflyer View Post
    Don't mean to hijack this thread (if it's still alive) but I have a related question. I know my "new" used rim is flat with no hi/lo spots, but I'm wondering if I should re-use the old spokes from my cracked rim? Any ideas? Thanks...

    Watch my Youtube video for spoke reuse guidelines..

    http://www.youtube.com/watch?v=hjdKJgh3d9Y&feature=plcp

    =8-)
    4000+ wheels built since 1984...

    Disclaimer:

    1. I do not claim to be an expert in bicycle mechanics despite my experience.
    2. I like anyone will comment in other areas.
    3. I do not own the preexisting concepts of DISH and ERD.
    4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
    5. My all time favorite book is:

    Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •