Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Can't get my head around this geometry issue

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Can't get my head around this geometry issue

Old 09-23-18, 08:52 PM
  #1  
raria
Senior Member
Thread Starter
 
Join Date: Jul 2017
Posts: 914
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 759 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Can't get my head around this geometry issue

So a hybrid is supposed to give you a more upright ride we all know that.
And a road bike is supposed to lay you down more flatter.

Now consider the typical medium sized bike (say a size 54cm).

Most hybrid bikes have an effective top tube of the hybrid bike in medium of 58+cm but the same road bike also in medium will have 54-55cm ETT.

If you add in stack and reach it gets even more compelling that the hybrid has a reach of > 400mm and the road bike <380mm.

So then how does a hybrid make you more upright which I know it does? What am I missing
raria is offline  
Old 09-23-18, 09:18 PM
  #2  
Jon T
Senior Member
 
Join Date: Jun 2017
Location: West Orange County, CA
Posts: 962

Bikes: '84 Peugeot PH10LE

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 341 Post(s)
Likes: 0
Liked 9 Times in 4 Posts
Seat and handlebar height maybe?
Jon
Jon T is offline  
Old 09-23-18, 09:38 PM
  #3  
Doctor Morbius
Interocitor Command
 
Doctor Morbius's Avatar
 
Join Date: Oct 2003
Location: The adult video section
Posts: 3,333

Bikes: Endurance Road, Road, DS Hybrid, Hybrid, Sport MTB

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 561 Post(s)
Liked 14 Times in 12 Posts
Most hybrid bikes have an effective top tube of the hybrid bike in medium of 58+cm but the same road bike also in medium will have 54-55cm ETT.
Where did you get this information?
Doctor Morbius is offline  
Old 09-23-18, 10:49 PM
  #4  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 4,175
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1002 Post(s)
Likes: 0
Liked 20 Times in 12 Posts
Flat bars are about even with the stem,

drop bars about 4" further out.
woodcraft is offline  
Old 09-23-18, 11:49 PM
  #5  
ColonelSanders
Senior Member
 
ColonelSanders's Avatar
 
Join Date: Jan 2014
Location: Brisbane, Australia
Posts: 3,883

Bikes: 2017 Surly Troll with XT Drive Train, 2017 Merida Big Nine XT Edition, 2016 Giant Toughroad SLR 2, 1995 Trek 830

Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1230 Post(s)
Liked 9 Times in 9 Posts
Originally Posted by raria View Post
So then how does a hybrid make you more upright which I know it does? What am I missing
Is the more upright only when you are comparing the flatbar hybrid with someone in the drops of the road bike?
ColonelSanders is offline  
Old 09-24-18, 12:40 AM
  #6  
Ironfish653
Senior Member
 
Join Date: Oct 2015
Location: Virginia Beach
Posts: 918

Bikes: 1997 Cannondale, 1976 Bridgestone, 1998 Softride

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 299 Post(s)
Liked 20 Times in 14 Posts
Could be that they're measuring reach to the bar clamp on the stem? In that case, a drop bar and brake hood would add another ~100mm to the effective reach.
A big saddle-to-bar drop will stretch you out over the same effective reach too, as you rotate forward.

Also, 'Hybrid' covers a lot of different bikes. Pretty much anything that doesn't have drop bars, or 50mm-wide tires. A couple of makes and models would help with the comparison, to nail down the specific differences.
Ironfish653 is offline  
Old 09-24-18, 01:14 AM
  #7  
HTupolev
Senior Member
 
Join Date: Apr 2015
Location: Seattle
Posts: 2,690
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 1164 Post(s)
Liked 18 Times in 14 Posts
Originally Posted by raria View Post
So a hybrid is supposed to give you a more upright ride we all know that.
And a road bike is supposed to lay you down more flatter.
That's sort of true on average, but certainly isn't always the case. "Hybrid" is an extremely wide umbrella.

What am I missing
Handlebar (and stem) geometry. Typical positions on drop handlebars are far forward of the handlebar clamp, and sometimes also beneath it, both things which extend the rider's reach to the bars. Handlebars used on hybrids frequently place hand positions behind the stem clamp, and sometimes also provide rise, both things which shorten a rider's reach to the bars.
HTupolev is offline  
Old 09-24-18, 09:09 AM
  #8  
raria
Senior Member
Thread Starter
 
Join Date: Jul 2017
Posts: 914
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 759 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Doctor Morbius View Post
Where did you get this information?
From various geo charts.

See https://geometrygeeks.bike/bike/boar...brid-pro-2017/ for medium. Reach is 414mm and ETT is 590mm.

Originally Posted by woodcraft View Post
Flat bars are about even with the stem,
drop bars about 4" further out.
Good point. Most hybrid and road bikes have stems of 100mm. But this chart https://www.pinterest.com/pin/449163762823060855 shows most drop bars add 90mm.

So if my math is correct. A medium hybrid has an ETT of say 590mm + 100mm (stem) = 690mm. A medium road bike has an ETT of 530mm + 100mm (stem) + 90mm (drop) = 720mm.

Maybe that 30mm feels a lot more than what it looks like on paper.
raria is offline  
Old 09-24-18, 10:34 AM
  #9  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,464

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6721 Post(s)
Likes: 0
Liked 139 Times in 117 Posts
angles and lengths ...

An Italian manual uses the BB, and a plumb line through it
to divide the top tube length into .. setback and reach

bars at same height as saddle lower or higher, & by how much is another option..
fietsbob 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

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