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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-16-07, 05:44 AM   #1
meltron
Senior Member
Thread Starter
 
meltron's Avatar
 
Join Date: Dec 2006
Location: E. Orange, NJ
Bikes: 1970 Carabela
Posts: 95
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A Question about Gear Ratio's

I currently ride a singlespeed at 50x16. I have on order a fixed rearwheel and now the dilemma is what cog to get. I've got a feeling running 50x16 fixed is going to be a bit tough of a ride...or not?

Should I get a 17t cog or go as far as getting a new chainring for a slightly lower/manageable fixed ride. One of the techs over at bikeworks nyc runs 50x17 fixed and says its not too bad.

Cheers.
meltron is offline   Reply With Quote
Old 05-16-07, 05:48 AM   #2
vee_dub
McNightrider
 
Join Date: Mar 2007
Bikes:
Posts: 389
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Run 17 or 18T cogs, you should be set. I used to run 51x16 its tough to ride up the hill with my massive body and ****ty heart.
Now I am running 46x16..alot better, but I am going to run 18T cog soon I will tell u what happen. hehe
vee_dub is offline   Reply With Quote
Old 05-16-07, 07:14 AM   #3
neuron
><
 
neuron's Avatar
 
Join Date: Dec 2004
Location: brooklyn!
Bikes: a disassembled bianchi lynx i'm gonna convert to ss, a felt roadie with carbon fork, and my baby blue peugeot roadie conversion. a couple sizes too large.
Posts: 239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i ran 52/16 SS for three months, and then 52/15 fixed for a year. i then dropped to 52/17, and then to 48/15, and am currently running 48/17 on my new bike.

depends on if you want to push or spin.
neuron is offline   Reply With Quote
Old 05-16-07, 10:10 AM   #4
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That is a pretty high gear. If you're used to pushing it on a singlespeed it won't really be much different fixed. But you might enjoy the jump to a smaller ratio if you try it, with either an 18 tooth cog for 75" or a 19 toother for 71". I really like a 69" gear (47/18) though it's not for everyone. Small gears on a fixed are all about power and control---easier to get going, easier to slow down.

Last edited by mander; 05-16-07 at 11:08 AM.
mander is offline   Reply With Quote
Old 05-16-07, 10:38 AM   #5
vee_dub
McNightrider
 
Join Date: Mar 2007
Bikes:
Posts: 389
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I thought 46/18 is 69"?? That is what i wanna achieve.
vee_dub is offline   Reply With Quote
Old 05-16-07, 10:58 AM   #6
1fluffhead
Senior Member
 
1fluffhead's Avatar
 
Join Date: Aug 2005
Location: baltimore
Bikes: Pake Track; Bianchi XL EV2 El Reparto Corse, Kona Jake the Snake
Posts: 1,663
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by vee_dub
I thought 46/18 is 69"?? That is what i wanna achieve.
46/18=69" running 32c tires
47/18=69" running 23c tires
1fluffhead is offline   Reply With Quote
Old 05-16-07, 11:00 AM   #7
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes they can both be 69" gears depending on wheel size. They're really close of course.
mander is offline   Reply With Quote
Old 05-16-07, 11:01 AM   #8
Ken Cox
King of the Hipsters
 
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
Posts: 2,129
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The typical factory fixed gear comes with a 48t chain ring and a 16t cog, which, with 700X23 wheels and tires, corresponds to 78.8 gear inches.

The phrase gear inches refers to the amount of effort required to pedal a Penny Farthing Big Wheel bike having, in this case, a 78.8 inch diameter Big Wheel.

The original poster's 50 X 16 setup, with 700X23 tires and wheels, comes out to 82.1 gear inches.

I have ridden an 82 gear inch setup in an mixed urban/suburban/rural community having a dynamic gain and loss of about 1000' with success.
I can't brake going downhill by back pedaling at 82 gear inches.

I personally, in my riding area, consider 72 gear inches the most versatile gear set up for me and my riding area.
I can brake going downhill by back pedaling at 72 gear inches.

50 X 18 makes 73 gear inches.

I presently ride 42 X 19, which makes 58 gear inches, as part of a learning experiment.
Mucho spin.

=====

Sheldon Brown maintains an online gear calculator.

http://sheldonbrown.com/gears/

Make sure to select the proper tire size, crank length (not so important), and gear inches (as opposed to gain ratio.

=====

A more usable online gear calculator exists.
I got the link from a thread on this forum.
Rabbit?
Anyway, I write from work and don't have it bookmarked on this computer.
Ken Cox is offline   Reply With Quote
Old 05-16-07, 11:05 AM   #9
mander
Senior Member
 
Join Date: Sep 2006
Location: Van BC
Bikes:
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://software.bareknucklebrigade.c...it.applet.html

Get your nerd on here
mander is offline   Reply With Quote
Old 05-16-07, 11:10 AM   #10
1fluffhead
Senior Member
 
1fluffhead's Avatar
 
Join Date: Aug 2005
Location: baltimore
Bikes: Pake Track; Bianchi XL EV2 El Reparto Corse, Kona Jake the Snake
Posts: 1,663
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This is the gear table that I like.
http://www.ctc.org.uk/resources/Abou...e/GEARTABL.XLS It's an excel spreadsheet that changes the values when you change the tyre section box to reflect what size tyre you want.

Got it from here:http://www.ctc.org.uk/DesktopDefault.aspx?TabID=3521
1fluffhead 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 09:12 PM.