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

Max seatpost height

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.

Max seatpost height

Old 01-14-22, 12:59 PM
  #51  
SJX426 
Senior Member
 
SJX426's Avatar
 
Join Date: May 2008
Location: Fredericksburg, Va
Posts: 8,323

Bikes: '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8

Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 1157 Post(s)
Liked 1,002 Times in 576 Posts
Originally Posted by Andy_K View Post
So, I'm curious, from a structural engineering perspective, does the fact that the force typically comes in at an angle modify the 1/3 2/3 rule? Granted there are cases where the impact may be perpendicular, and I guess structural engineering is all about those worst case scenarios.....
IIRC that rule applies to a force perpendicular to the lever and not an impact or distributed force. its been over 40 years since that class and I am too lazy to pull the text book out!
__________________
Bikes don't stand alone. They are two tired.
SJX426 is offline  
Old 01-14-22, 01:33 PM
  #52  
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 6,696

Bikes: Lots. Just...lots.

Mentioned: 190 Post(s)
Tagged: 0 Thread(s)
Quoted: 1618 Post(s)
Liked 1,138 Times in 533 Posts
There is, admittedly, some variance in IM seatpost diameters. All of mine have been 27.0, across 85-86-87-88, but know that others have used a 27.2…although don’t know if those were from the factory or aftermarket fits.

At any rate, better to buy a new and longer post than have the insertion line above the lug. It’s there for a reason and put there by smarter people than us. Well, me, anyway.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Old 01-14-22, 02:10 PM
  #53  
shoota 
Senior Member
Thread Starter
 
shoota's Avatar
 
Join Date: Jun 2012
Location: Stillwater, OK
Posts: 7,590
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1608 Post(s)
Liked 402 Times in 279 Posts
Originally Posted by rccardr View Post
There is, admittedly, some variance in IM seatpost diameters. All of mine have been 27.0, across 85-86-87-88, but know that others have used a 27.2Öalthough donít know if those were from the factory or aftermarket fits.

At any rate, better to buy a new and longer post than have the insertion line above the lug. Itís there for a reason and put there by smarter people than us. Well, me, anyway.
Already done. A carbon 27.2 that slid right in.
__________________
2014 Cannondale SuperSix EVO 2
2019 Salsa Warbird
shoota 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 © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.