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


Go Back   > >

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!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-10-10, 03:02 AM   #1
milkprosecutor
Newbie
Thread Starter
 
Join Date: Mar 2010
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
opinions needed

im inbetween two 49 cm bikes both the same stand over height of 29.7"

my inseam is just about 28.6"

think id be better off going smaller?
or could i just deal with it
milkprosecutor is offline   Reply With Quote
Old 03-10-10, 05:06 AM   #2
bruce19
Senior Member
 
bruce19's Avatar
 
Join Date: Jul 2006
Location: Lebanon (Liberty Hill), CT
Bikes: MASI Gran Criterium S, Colnago World Cup CX & Guru steel
Posts: 4,574
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
I'm certainly no expert but I've used a formula I found in a Greg LeMond book about 20 yrs. ago and it's always worked perfectly for me. His coach said to measure your inseam floor to crotch in bare feet. In my case it was 32.5", convert it to CM (82.5) and multiply by .665. This gave me a frame size of 54-55 cm measured center to center. In my case I can ride bikes in a range of 53-56 cm but that 54-55 is the sweet spot.
bruce19 is offline   Reply With Quote
Old 03-10-10, 07:14 AM   #3
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Bikes: Bottecchia Sprint
Posts: 14,619
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 269 Post(s)
I think I read somewhere that it is wise to have 2" clearance between the top tube and your crotch flat footed.
rumrunn6 is offline   Reply With Quote
Old 03-10-10, 08:19 AM   #4
AdamDZ 
Bike addict, dreamer
 
AdamDZ's Avatar
 
Join Date: Nov 2009
Location: Queens, New York
Bikes:
Posts: 5,165
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rumrunn6 View Post
I think I read somewhere that it is wise to have 2" clearance between the top tube and your crotch flat footed.

With today's various frame geometries this may not always be true.

Adam
AdamDZ is offline   Reply With Quote
Old 03-10-10, 09:24 AM   #5
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Bikes: Bottecchia Sprint
Posts: 14,619
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 269 Post(s)
agreed - especially a sloping top tube. I mean where would you even measure a sloping top tube ...?
rumrunn6 is offline   Reply With Quote
Old 03-10-10, 11:49 AM   #6
ddez
Senior Member
 
Join Date: Jul 2009
Location: Alberta,Canada.
Bikes:
Posts: 800
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Most manufacturers measure sloping top tube stand over 12ins from center of saddle down tube ,about where you would stand when off saddle.
ddez is offline   Reply With Quote
Old 03-10-10, 12:34 PM   #7
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Bikes: Bottecchia Sprint
Posts: 14,619
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 269 Post(s)
I suspected that but its nice to have that confirmed
rumrunn6 is offline   Reply With Quote
Old 03-10-10, 02:04 PM   #8
stapfam
Time for a change.
 
stapfam's Avatar
 
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
Posts: 19,915
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Standover height is the least critical measurement on a bike. The more critical measurement is top tube length. That will denote whether you re going to be comfortable on a bike or be too stretched or cramped.

Compact frames will have a standover height- like for like in frame size- that is less than a conventional frame. But as I have said- Standover height is not critical. I only have one bike that has a clearance on the top tube and that is a Mountain bike. And that clearance is only just there.

So 49cm- you must be a shortie like me. We do have a problem in getting bikes to fit. To an extent we have to compromise a bit on fit. I can get the bikes to fit me- but with the saddle at the right height- I cannot touch the ground. My legs are 2" too short. That is the same on all my bikes and I ride a 49 and a 51cm. Attachment is of my 49cm Giant OCR3 as you can see- I could lower the seat by a good amount if required. and bar height/ reach can be adjusted by a change of stem.

So find a bike shop and see what they suggest.
Attached Images
File Type: jpg DSC01020.jpg (102.5 KB, 1 views)
__________________
How long was I in the army? Five foot seven.


Spike Milligan
stapfam 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 06:53 AM.