Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-22-12, 11:25 PM   #1
Ciufalon
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes: A few
Posts: 918
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Question re: frame size/SO height

Can someone please answer this question. I am looking at a couple of bikes online that both have the same size wheels. One is a 21.5" frame; the other a 23" frame. Both say the stand over height is 32". How can that be? BB height difference? The 21.5" bike does have larger tires, but by less than a quarter inch. I contacted the sellers and confirmed the measurement as being the exact measurement from ground to top of cross bar. Both have level horizontal top bars. Can the top bars be placed in a lower position on some frames?
Ciufalon is offline   Reply With Quote
Old 04-23-12, 09:44 AM   #2
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Bikes:
Posts: 14,647
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
bottom bracket height and measurement of frame are two places where the height could vary
unterhausen is offline   Reply With Quote
Old 04-23-12, 10:30 AM   #3
MassiveD
Senior Member
 
Join Date: Jul 2011
Bikes:
Posts: 2,368
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Quite commonly bikes are not measured properly. Sounds like this is an ebay type situation, rather than a catalog one. Cats are really bad.

Sloping top tube to some degree would make sense, even if they look relatively level. Another possibility is that the larger frame is not it's full size just because it is called a 23 doesn't mean it is. There can be a 1.5 difference in BB heights. Normally there is a preferred height for a given service, but I have seen that much variation. I remember this one aluminum touring frame that was so high it could have run 26" wheels as well as 700c with a few tweaks.
MassiveD is offline   Reply With Quote
Old 04-23-12, 10:41 AM   #4
Scooper
Decrepit Member
 
Scooper's Avatar
 
Join Date: Aug 2005
Location: San Francisco California
Bikes: Waterford 953 RS-22
Posts: 10,215
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Also, if the frame is measured from the crank center to the top of the seat tube, the standover height would be lower if the intersection of the top tube and the seat tube is significantly below the top of the seat tube.

Case in point; both of these frames are sized as 24" from the crank center to the top of the seat tube, but the Super Sport has a significantly lower standover height (~1"):

'72 Paramount:



'73 Super Sport:

__________________
- Stan
I'm with her.

Last edited by Scooper; 04-23-12 at 10:52 AM. Reason: typo
Scooper is offline   Reply With Quote
Old 04-23-12, 12:23 PM   #5
Ciufalon
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes: A few
Posts: 918
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the replies. I think that answers my question. Differences in how they measure the frame, more or less seat tube extending above top tube, BB height, etc.
Ciufalon is offline   Reply With Quote
Old 04-24-12, 12:28 AM   #6
MassiveD
Senior Member
 
Join Date: Jul 2011
Bikes:
Posts: 2,368
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
One thing to focus on is how you could get them to give you the info you want. If the people you are dealing with have tape measures and access to the bikes, you should be able to come up with some pointed questions that would allow you to get real info.
MassiveD is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 03:08 PM.