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

Chain stay length help please?

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.

Chain stay length help please?

Old 02-27-14, 01:45 PM
  #1  
SquidPuppet
Calamari Marionette Ph.D
Thread Starter
 
SquidPuppet's Avatar
 
Join Date: Dec 2013
Location: Coeur d' Alene
Posts: 7,965

Bikes: 3 Chinese Gas Pipe Nerdcycles and 2 Chicago Electroforged Boat Anchors

Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 2345 Post(s)
Liked 1 Time in 1 Post
Chain stay length help please?

I am using BikeCAD (free version) to design the basics of a single speed trail bike that I'd like to build. I am only laying out the primary dimensions in a profile view so that I'd have a somewhat realistic starting point for discussion with a frame builder once I choose one.

How long must a steel chain stay be to accomodate a 26 inch (559) x 55mm tire while running a 42T chainring on a 68mm BB?

It's easy enough for me to position the virtual rear wheel anywhere I like, but I know that there would need to be some length for the bends to create the needed clearance as the stays come off of the bottom bracket.

Thanks for any advice or comments.

Last edited by SquidPuppet; 02-27-14 at 02:55 PM.
SquidPuppet is offline  
Old 02-27-14, 10:37 PM
  #2  
Mark Kelly 
Senior Member
 
Mark Kelly's Avatar
 
Join Date: Oct 2009
Location: Willy, VIC
Posts: 644
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The freeware RattleCAD does this automatically.
Mark Kelly is offline  
Old 02-28-14, 06:01 AM
  #3  
ftwelder
Senior Member
 
ftwelder's Avatar
 
Join Date: Apr 2010
Location: vermont
Posts: 3,091

Bikes: Many

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
A lot depends on what you intend to use for chain stay tubes. Most commercially made chain stays tube work well with 17" stays and 26" wheels.
ftwelder is offline  
Old 02-28-14, 08:30 AM
  #4  
ksisler
Senior Member
 
Join Date: Sep 2012
Posts: 1,720
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by SquidPuppet View Post
I am using BikeCAD (free version) to design the basics of a single speed trail bike that I'd like to build. I am only laying out the primary dimensions in a profile view so that I'd have a somewhat realistic starting point for discussion with a frame builder once I choose one. How long must a steel chain stay be to accomodate a 26 inch (559) x 55mm tire while running a 42T chainring on a 68mm BB?

It's easy enough for me to position the virtual rear wheel anywhere I like, but I know that there would need to be some length for the bends to create the needed clearance as the stays come off of the bottom bracket. Thanks for any advice or comments.
OP; The finished length is only one of the variables... recommend looking at some of the specific CS's offered (see the builders suppliers section for MTB oriented CS's). The type and degree of bend(s), the type of dropout, width of the BB, etc., all come into play. Then model it as top down view to see if if might fit. Having an actually wheel with the tire mounted can also be very helpful in visualizing it. BTW; if you screen capture the pix of one of the MTB CS's and then print it out (with the aspect ration locked) full size you can check it with the real wheel. All else aside, sometimes it makes sense to put a bit more bend in them.

Hope that helps
/K
ksisler is offline  
Old 02-28-14, 10:13 AM
  #5  
SquidPuppet
Calamari Marionette Ph.D
Thread Starter
 
SquidPuppet's Avatar
 
Join Date: Dec 2013
Location: Coeur d' Alene
Posts: 7,965

Bikes: 3 Chinese Gas Pipe Nerdcycles and 2 Chicago Electroforged Boat Anchors

Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 2345 Post(s)
Liked 1 Time in 1 Post
Thanks guys, that helps.
SquidPuppet is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Gary Fountain
Classic & Vintage
16
07-02-11 09:44 PM
mzeffex
"The 33"-Road Bike Racing
0
01-13-10 08:15 PM

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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.