Go Back  Bike Forums > Bike Forums > Framebuilders
Reload this Page >

Odd (?) frame dimensions

Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Odd (?) frame dimensions

Old 07-15-23, 02:27 PM
Senior Member
Thread Starter
Join Date: Feb 2020
Posts: 2,727
Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
Quoted: 1034 Post(s)
Likes: 0
Liked 1,207 Times in 715 Posts
Odd (?) frame dimensions

I have a mystery frame that I built into a bike; pics here:

Who made my favourite bike (frame)?

The reason I'm also posting in this sub-forum is to ask if these numbers (all c-c) are peculiar:
Seat-tube 50cm
Top-tube 54cm
Chainstay 42cm - crank to axle
Seatlug says 75, can't see an angle on the head lugs.
Wheelbase is 99cm but the fork isn't original.
oneclick is offline  
Old 07-15-23, 05:02 PM
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,083
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,410 Times in 2,337 Posts
I don't think it's a Austro-Daimler, but their dimensions were a little out of whack like that.
unterhausen is offline  
Old 07-17-23, 07:52 AM
Senior Member
Andrew R Stewart's Avatar
Join Date: Feb 2012
Location: Rochester, NY
Posts: 17,701

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4036 Post(s)
Liked 3,468 Times in 2,101 Posts
I don't think these numbers are so far off base from common small sized sporting bikes. Seat tube/top tube is "over square", a large frame would be "under square" usually. That "75" on the seat lug doesn't mean the seat tube angle is actually 75*, just that it is what the lug was made for. Stamped sheet metal lugs can tolerate a couple of degrees of fit from the OEM angle. So this frame could have a 74 seat angle which on a small frame is quite typical. Chainstay length is pretty common and so is the wheelbase.

This frame is close to what I might ride. Andy
Andrew R Stewart 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
Trackbacks are Off
Pingbacks are Off
Refbacks are 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.