Singlespeed & Fixed Gear - Gear ratio

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seaden
11-27-05, 11:57 PM
I recently have a 52 chainring to a 20t cog

I'm thinking of building another bike and have a 42t chainring...what size cog do I need to get in the back to create the same or almost the same gear ratio...

zip22
11-27-05, 11:58 PM
http://home.i1.net/~dwolfe/gerz/

or
http://www.fixedgeargallery.com/resources/gearchart.jpg

16t if you're lazy or blind
Lunigma
11-28-05, 12:15 AM
you should try sheldons site. http://sheldonbrown.com/gears/

zip22
11-28-05, 12:23 AM
meh, a little more work. i like the charts.
humancongereel
11-28-05, 01:13 AM
you should just go to sheldon's site if you have questions, period. and browse around there every now and then...very informative, you might find answers to questions you didn't know you had.
Ceya
11-28-05, 01:18 AM
52 x 20 =70.2 "

42 x 16 = 70.9"

S/F,
CEYA!
huhenio
11-28-05, 06:58 AM
get a different gear ratio on the second bike .. either lower or higher

just to spice up things
Chopper
11-28-05, 11:10 AM
Chainring times (x) 27 divided(/) by the rear cog. ie 46x27/18 = 69.....

Am I the only standover man that offers bloody mathematical advice to these idiots...

Do I look like Mark 'Einstein' Read?
noisebeam
11-28-05, 11:11 AM
More charts! Here is one I made. Double the skid patches if you skid ambi:

http://www.optionnz.com/users/afs/i1/fixedratio.jpg

Al