Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Measure rear dropouts from inside or outside?

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Measure rear dropouts from inside or outside?

Old 05-29-20, 03:09 AM
  #1  
mcoate
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Measure rear dropouts from inside or outside?

I have a 70's(?) Dawes Galaxy and the inner dimension is around 117.5mm but the outer says almost exactly 126mm. Everything I read tells me to measure the inner but that seems way too narrow?
mcoate is offline  
Old 05-29-20, 03:16 AM
  #2  
oneclick
Senior Member
 
Join Date: Feb 2020
Posts: 256
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Likes: 0
Liked 88 Times in 60 Posts
Originally Posted by mcoate View Post
I have a 70's(?) Dawes Galaxy and the inner dimension is around 117.5mm but the outer says almost exactly 126mm. Everything I read tells me to measure the inner but that seems way too narrow?
Insides - in general you measure to where parts contact (in this case locknut faces against frame).

It's narrow, for 120.

But not much. It'll spring that no trouble, or you can bend it.

It's only 2.5mm. My girlfriend's fingernails are thicker than that.

(Measure your wheel first; could be 117.5 itself.)
oneclick is offline  
Old 05-29-20, 03:21 AM
  #3  
mcoate
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Ok thanks. So I should be ordering 120mm for the rear wheel?
mcoate is offline  
Old 05-29-20, 03:30 AM
  #4  
randyjawa 
Senior Member
 
randyjawa's Avatar
 
Join Date: Apr 2007
Location: Thunder Bay, Ontario, Canada - burrrrr!
Posts: 9,827

Bikes: 1958 Rabeneick 120D, 1968 Legnano Gran Premio, Rocky Mountain Cardiac, 196? Torpado Professional

Mentioned: 166 Post(s)
Tagged: 0 Thread(s)
Quoted: 787 Post(s)
Likes: 0
Liked 312 Times in 218 Posts
Ok thanks. So I should be ordering 120mm for the rear wheel?
Yes, 120mm should be the proper distance between the inside faces of the rear drops. At 117 mm, you should have little trouble, if any, slipping the rear wheel into place.

You might also want to check to see what got bent, to reduce the drop space from 120 to 117. It is possible that that is the way it came from the factory or it could mean that the bike was dropped and bent the rear triangle out of alignment. Easy enough to check with a string and measuring tape.
__________________
"98% of the bikes I buy are projects".
randyjawa is offline  
Old 05-29-20, 05:50 AM
  #5  
nlerner
Senior Member
 
Join Date: Dec 2005
Posts: 12,916
Mentioned: 285 Post(s)
Tagged: 0 Thread(s)
Quoted: 1493 Post(s)
Liked 547 Times in 322 Posts
The dimension is usually referred to as OLD: over-locknut dimension, so it’s a measurement of the rear hub, which makes it a measurement of the distance between insides of the dropouts, if that makes any sense.
nlerner 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 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.