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

Thread Tools Search this Thread
Old 05-05-10, 08:44 PM   #1
Canadian Chick
Thread Starter
Aquakitty's Avatar
Join Date: Jun 2009
Location: BC, Canada
Bikes: Lots
Posts: 648
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Need some newb info on gear ratios

So I am converting my spouses bike to a single speed. He is pretty new to cycling. Anyways after trashing a few derailleurs I decided I am going to put him on an internal hub (waiting on the 11 speed alfine coming out in sept.) Until then I am putting a single sped freewheel conversion in.
This is the first time I ever have done this, I of course read all the material on the subject esp. sheldon brown's info, where he suggests a 2:1 ratio.

So I though I would put him on a 38t front and 16t in back.. not quite 2:1 but close enough.. so I ordered a fire eye 14/16 9speed conversion kit found here.

Then, today, I put him on my old 12 speed and got him to find the gears he was comfortable going up hills with... we do a lot of offraod trail riding and theres tons of hills in my area.

Uho oh.. problem... the ratio that is comfortable for hill climbing and general use for him (and I don't blame him for that matter) is more like 1.2! I think it was a 32T in back and a 39T in front.

Whoops, I ordered a 16T... and the biggest fire eye sprockets go in the back is 18T.. lol so what now I would need a freaking 20T or 22T on the front? Every single speed crankset I look at only goes to 38T most are 44 or 46T.. so I would need a 58 BCD compact mtb crank not really what I was going for.

Is this a common issue or am I missing something.. I can't see using such a big ratio for hilly areas or offroad riding it'd be ridiculous.. what am I missing?

Thanks in advance
Aquakitty is offline   Reply With Quote
Old 05-05-10, 09:58 PM   #2
Join Date: Apr 2010
Posts: 6,749
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You've misread, you need a gear ratio of ~3:1.
If you've ordered the 16t sprocket, get a 42t chainring. It gives a ratio of 2.6 which is high enough to go reasonable fast on flat, but might take a bit of work to climb.

Last edited by Squirrelli; 05-05-10 at 10:02 PM.
Squirrelli is offline   Reply With Quote

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 08:30 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.