Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Top Tube Noob Question

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Top Tube Noob Question

Old 06-19-14, 02:20 PM
Senior Member
Thread Starter
Join Date: Mar 2011
Posts: 70
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Top Tube Noob Question

What are the affects of having a top tube that is more angled than a flat top tube?
crad159 is offline  
Old 06-19-14, 02:27 PM
Senior Member
kv501's Avatar
Join Date: Oct 2011
Posts: 832
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by crad159 View Post
What are the affects of having a top tube that is more angled than a flat top tube?
Manufacturers will tell you that it has comfort/performance benefits, but the real reason they do it is to have fewer frame sizes fitting more riders with less cost.
kv501 is offline  
Old 06-19-14, 02:31 PM
Senior Member
99Klein's Avatar
Join Date: Nov 2012
Location: Lincoln Nebraska
Posts: 1,088

Bikes: 99 Klein Quantum, 2012 Cannondale CAAD10 5, Specialized Tarmac Comp, Foundry Thresher, Fuji Sportif

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
Likes: 0
Liked 1 Time in 1 Post
So you can look like a pro
99Klein is offline  
Old 06-19-14, 02:35 PM
Senior Member
Join Date: Sep 2011
Posts: 4,656
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1924 Post(s)
Liked 185 Times in 135 Posts
It fixes standover height problems for more people.
redlude97 is offline  
Old 06-19-14, 10:58 PM
Thread Killer
Join Date: Aug 2008
Location: Ann Arbor, MI
Posts: 10,263

Bikes: '15 Kinesis Racelight 4S, '76 Motebecane Gran Jubilée, '17 Dedacciai Gladiatore2, '12 Breezer Venturi, '09 Dahon Mariner, '12 Mercier Nano, '95 DeKerf Team SL, '19 Tern Rally, ‘21 Breezer Doppler Cafe+, ‘19 T Lab X3

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1450 Post(s)
Liked 464 Times in 292 Posts
It depends on frame size and material, some combinations of which it can allow for smaller, tighter triangles, and thusly, a stiffer, better handling bike. It also makes for less material in the frame, both absolutely (shorter tubes) and by design (tubes can be lighter construction because the rigidity is part of geometry), making a lighter, more responsive bike.

Giant brought compact geometry mainstream, and the biz has not looked back for about 20 years now.
chaadster is offline  
Old 06-20-14, 02:11 AM
Senior Member
Fiery's Avatar
Join Date: Oct 2010
Posts: 1,360
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 242 Post(s)
Liked 18 Times in 13 Posts
You get more standover clearance. Everything else is a moot point - there are stiff, light, comfortable frames with all kinds of top tube angles and shapes, from dead level to very angled, both straight and curved.
Fiery is offline  
Old 06-20-14, 05:06 AM
Bob Ross
your god hates me
Bob Ross's Avatar
Join Date: Apr 2006
Posts: 4,004

Bikes: 2018 Cannondale CAADX 105 SE, 2016 Richard Sachs, 2010 Carl Strong, 2006 Cannondale Synapse

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 545 Post(s)
Liked 156 Times in 99 Posts
Originally Posted by crad159 View Post
What are the affects of having a top tube that is more angled than a flat top tube?
Bob Ross is offline  
Old 06-20-14, 06:07 AM
cowboy, steel horse, etc
LesterOfPuppets's Avatar
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 36,653

Bikes: everywhere

Mentioned: 60 Post(s)
Tagged: 1 Thread(s)
Quoted: 7083 Post(s)
Liked 2,461 Times in 1,306 Posts
They didn't do sloping much BITD cuz it would likely mean having a few different seat lugs to cover a size range. TIG'd frames meant lugs don't matter any more. MTBs were mostly sloping by 1991. Dunno when roadies got to be mostly sloping. 1999ish?

Edit: I guess you'd need a variety of top head lugs for sloping lugged frames, also.

Last edited by LesterOfPuppets; 06-20-14 at 08:13 AM.
LesterOfPuppets is online now  
Old 06-20-14, 06:17 AM
Senior Member
Join Date: Jun 2011
Location: Madison, AL
Posts: 693

Bikes: 2010 Felt DA, 2012/6 Felt F5, 2015 Felt AR FRD

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
For a given wheelbase, crank position,handlebar position, a slanted top tube can do a few things:

1. Shorter seat stays
2. Sorter top tube
3. Longer head tube

What effect these have for a given saddle position is for further discussion.
KBentley57 is offline  
Related Topics
Thread Starter
Last Post
02-06-19 08:10 PM
Tandem Cycling
08-07-16 03:02 PM
08-23-13 06:10 PM
Fifty Plus (50+)
02-11-11 01:34 PM
Bicycle Mechanics
05-22-10 06:57 AM

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.