Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Removing rim hop other than with spoke tension

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Removing rim hop other than with spoke tension

Old 02-21-21, 11:09 AM
  #1  
Jicafold
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 940
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 286 Post(s)
Liked 85 Times in 63 Posts
Removing rim hop other than with spoke tension

So I have this rear wheel with a vintage Ambrosio rim in a laced with 36 butted spokes to a Suntour hub. Came on a used bike I bought. I have built a few wheels and trued many sets...however, I hate working with hops. So this wheel has a 3mm - 4mm hop spanning 2 or 3 spokes. It's looking too big to get out with spoke tension alone. So what other methods are there? I read elsewhere on the forum that I could loosen all the spokes and then hang the wheel over a beam or something at that spot and pull a bit to get it close. Are there any other methods for the home mechanic to true these larger hops? Thank you.
Jicafold is offline  
Old 02-21-21, 12:21 PM
  #2  
daverup 
Senior Member
 
daverup's Avatar
 
Join Date: Jun 2019
Location: Michigan USA
Posts: 569

Bikes: A bunch of old bikes.

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 160 Post(s)
Liked 403 Times in 213 Posts
Originally Posted by Jicafold View Post
So I have this rear wheel with a vintage Ambrosio rim in a laced with 36 butted spokes to a Suntour hub. Came on a used bike I bought. I have built a few wheels and trued many sets...however, I hate working with hops. So this wheel has a 3mm - 4mm hop spanning 2 or 3 spokes. It's looking too big to get out with spoke tension alone. So what other methods are there? I read elsewhere on the forum that I could loosen all the spokes and then hang the wheel over a beam or something at that spot and pull a bit to get it close. Are there any other methods for the home mechanic to true these larger hops? Thank you.
I think the usual recommendation is to get a bike shop to straighten your rim with a proper tool. However, I have taken out flat spots with a strap and a vertical post. I loosened the spokes and strapped the rim at the flat spot to the post. This is described somewhere online, but I didn't find it.
daverup is offline  
Old 02-21-21, 12:44 PM
  #3  
Steelman54 
Full Member
 
Join Date: Jun 2014
Location: SW Ohio
Posts: 268

Bikes: Allegro Model 77, Gitane Team Pro SLX, Waterford R2200

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked 49 Times in 35 Posts
Is the hop at the joint or elsewhere. If at the joint, there may not be much you can do, although 3 or 4 mm seems like a lot to be out. Also, you suggest pulling on rim to get the hop out, is the hop on outside or is it a flat spot on pushed inside the OD. If a flat spot, Daverup's suggestion as has worked for me.
Steelman54 is offline  
Old 02-21-21, 02:53 PM
  #4  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 23,743

Bikes: Several, mostly not name brands.

Mentioned: 142 Post(s)
Tagged: 0 Thread(s)
Quoted: 3041 Post(s)
Liked 2,169 Times in 1,294 Posts
There used to be a tool for this, the "Overland Rim-True." AFAIK, it's been out of production for a long time, but you may still be able to find one, or fabricate a functional copy:
Attached Images
File Type: jpg
overland-rim-true.jpg (64.6 KB, 76 views)
JohnDThompson is online now  
Old 02-21-21, 03:52 PM
  #5  
Jicafold
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 940
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 286 Post(s)
Liked 85 Times in 63 Posts
Originally Posted by daverup View Post
I think the usual recommendation is to get a bike shop to straighten your rim with a proper tool. However, I have taken out flat spots with a strap and a vertical post. I loosened the spokes and strapped the rim at the flat spot to the post. This is described somewhere online, but I didn't find it.
That seems like a good idea. I was thinking of putting the low spot centered between 2 pieces of 2 x 4 on the ground and then using like a broomstick or something pressing outwards. But I don't want to dent it.
Jicafold is offline  
Old 02-21-21, 04:42 PM
  #6  
grizzly59
Senior Member
 
Join Date: Aug 2016
Posts: 712
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 283 Post(s)
Liked 262 Times in 164 Posts
Aluminum is funny, everything looks good as you straighten whatever piece you're working with, then all of a sudden it just gives way permanently too far the other way. Steel is predictable, Al not so much. Confession of a ham-fisted halfwit.
grizzly59 is offline  
Likes For grizzly59:
Old 02-22-21, 10:13 AM
  #7  
Steelman54 
Full Member
 
Join Date: Jun 2014
Location: SW Ohio
Posts: 268

Bikes: Allegro Model 77, Gitane Team Pro SLX, Waterford R2200

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked 49 Times in 35 Posts
OK, so it is a flat spot, right. Daverup's suggestion seems good to me.

Yes, Aluminum does not have the ductility of steel, so you can move it only a bit before it cracks. Keep in mind, you may still be buying a new rim.
Steelman54 is offline  
Old 02-22-21, 01:21 PM
  #8  
cjenrick
Senior Member
 
Join Date: May 2020
Posts: 409
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 177 Post(s)
Liked 127 Times in 94 Posts
do people check rims for roundness before they lace them up?
cjenrick is offline  
Old 02-22-21, 01:47 PM
  #9  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,178

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1519 Post(s)
Liked 806 Times in 589 Posts
Is the "hop" directly across from the valve hole?
Often the joint has a flat spot.
Bill Kapaun is offline  
Old 02-22-21, 01:54 PM
  #10  
deacon mark
Senior Member
 
Join Date: Sep 2009
Posts: 1,885

Bikes: Habanero Titanium Team Nuevo

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 357 Post(s)
Liked 150 Times in 104 Posts
I had a kinlin xc 279 that had hop was out maybe that far could feel in riding. Rim was rideable and worked fine but drive me nuts. I quit fighting bought new rim. Big out of round is hard to fix better to get another.
deacon mark is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.