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

Options for fitting a 6 speed hub to dropouts designed for 7 speed

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.

Options for fitting a 6 speed hub to dropouts designed for 7 speed

Old 01-22-08, 04:57 PM
  #1  
py272
Junior Member
Thread Starter
 
Join Date: Dec 2007
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Options for fitting a 6 speed hub to dropouts designed for 7 speed

I picked up an older Specialized Hard Rock mountain bike that was missing wheels as I had some wheels laying around. The front wheel fitted but the back wheel had a large gap between the rear dropouts and the hub axle nuts. I then realized that my wheel was an older model with a six speed freewheel and I think the spacing between the dropouts of the Hardrock is designed for a 7 speed axle. Not wanting to buy another wheel, I was wondering what are my options.

Can I just add spacers to my current 6 speed wheel? Would this create another other problems?

Thanks
py272 is offline  
Old 01-22-08, 06:07 PM
  #2  
Sheldon Brown
Gone, but not forgotten
 
Sheldon Brown's Avatar
 
Join Date: Jul 2002
Location: Newtonville, Massachusetts
Posts: 2,301

Bikes: See: https://sheldonbrown.org/bicycles

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Originally Posted by py272 View Post
I picked up an older Specialized Hard Rock mountain bike that was missing wheels as I had some wheels laying around. The front wheel fitted but the back wheel had a large gap between the rear dropouts and the hub axle nuts. I then realized that my wheel was an older model with a six speed freewheel and I think the spacing between the dropouts of the Hardrock is designed for a 7 speed axle. Not wanting to buy another wheel, I was wondering what are my options.

Can I just add spacers to my current 6 speed wheel?
Yes. Add the spacers to the left side, then re-dish the wheel (this will make the wheel stronger.)

Sheldon "https://sheldonbrown.com/frame-spacing" Brown
Sheldon Brown is offline  
Old 01-22-08, 06:33 PM
  #3  
py272
Junior Member
Thread Starter
 
Join Date: Dec 2007
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
sheldon_brown,

Thanks for the reply but I was wondering why just to the left side and not equally to both sides. I am thinking if I add an equal size to each side I would not need to redish the wheel. And if I decide to use a 7 speed freewheel, would adding just the spacer on the left side cause the freewheel to be too close to the right dropout?

Thanks
py272 is offline  
Old 01-23-08, 01:27 AM
  #4  
tengu
Igor
 
Join Date: Aug 2004
Location: seattle
Posts: 15

Bikes: peugeot fixie

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
py272, your frame spacing should measure 130 or 135mm. Your wheel will measure 126 or 130mm at the locknuts. Right? If your frame is a good distance off from this you need to cold set it (bend). The Hardrock frame is super strong and can handle this a few times. Bend the rear triangle (with the help of your lbs of course) to the same size as your rear hub. That 6 speed wheel is plenty strong and if it's old you don't want to mess with it too much.
tengu is offline  
Old 01-23-08, 05:18 AM
  #5  
WNG
Spin Forest! Spin!
 
WNG's Avatar
 
Join Date: Sep 2007
Location: Arrid Zone-a
Posts: 5,964

Bikes: I used to have many. And I Will again.

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 8 Times in 8 Posts
Well, adding spacers to the left side only allows you to redish the wheel for reduced dish and this yields a stronger more reliable wheel. Also the shifting performance and range won't be compromised. The swing of the RD may not be enough if you try to center the wheel with spacers equally on both sides.
WNG 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 or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.