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 03-14-12, 07:20 AM #1 wheelhorseman Junior Member Thread Starter   Join Date: Feb 2012 Bikes: Posts: 20 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Gear Ratio Question Which of the following is the HIGHER gear ratio. 46/18 or 44/16?
 03-14-12, 07:34 AM #2 norskagent car dodger     Join Date: Aug 2005 Location: garner/raleigh nc Bikes: Posts: 3,366 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 1 Post(s) Just do the math - 46/18 = 2.55, 44/16 = 2.75. For gear inches multiply by ~27" 1st = ~69", 2nd = ~74". __________________ 1989 Schwinn Paramount OS 1980 Mclean/Silk Hope Sport Touring 1983 Bianchi pista 1976 Fuji Feather track 1979 raleigh track "I've consulted my sources and I'm pretty sure your derailleur does not exist"
 03-14-12, 07:51 AM #3 wheelhorseman Junior Member Thread Starter   Join Date: Feb 2012 Bikes: Posts: 20 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) I didnt know how to compute the figures. So the 44/16 is the higher ratio correct?? What i am trying to do is decrease the amount of pedal revoultions to go the same speed Is it worth the trouble to change sprockets seeing as how the figures are quite close?
 03-14-12, 08:08 AM #4 Grand Bois Senior Member     Join Date: Mar 2005 Location: Pinole, CA, USA Bikes: Posts: 17,153 Mentioned: 14 Post(s) Tagged: 0 Thread(s) Quoted: 290 Post(s) Just get a larger cog.
 03-14-12, 08:24 AM #5 norskagent car dodger     Join Date: Aug 2005 Location: garner/raleigh nc Bikes: Posts: 3,366 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 1 Post(s) no I think he wants a smaller cog. __________________ 1989 Schwinn Paramount OS 1980 Mclean/Silk Hope Sport Touring 1983 Bianchi pista 1976 Fuji Feather track 1979 raleigh track "I've consulted my sources and I'm pretty sure your derailleur does not exist"
03-14-12, 10:01 AM   #6
garage sale GT
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 Originally Posted by wheelhorseman What i am trying to do is decrease the amount of pedal revoultions to go the same speed
I assume you realize the force required will go up in direct proportion to how much the pedal revolutions go down.

03-14-12, 10:15 AM   #7
Grand Bois
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 Originally Posted by norskagent no I think he wants a smaller cog.
I think you're right.

 03-14-12, 11:31 AM #8 wheelhorseman Junior Member Thread Starter   Join Date: Feb 2012 Bikes: Posts: 20 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Yes i know it will be slightly harder to pedal but thats ok. I have a 20in. bike geared 34/20 and you will pedel your butt off and not be going past walking speed. Im not a teenager anymore.
 03-14-12, 11:33 AM #9 norskagent car dodger     Join Date: Aug 2005 Location: garner/raleigh nc Bikes: Posts: 3,366 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 1 Post(s) 20" wheels? or frame size? __________________ 1989 Schwinn Paramount OS 1980 Mclean/Silk Hope Sport Touring 1983 Bianchi pista 1976 Fuji Feather track 1979 raleigh track "I've consulted my sources and I'm pretty sure your derailleur does not exist"
03-14-12, 11:34 AM   #10
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Quote:
 What i am trying to do is decrease the amount of pedal revoultions to go the same speed
that is a higher gear ratio
bigger chain ring turning your [probably a Fixie] smaller cog more often ..

people who race on a velodrome, bring a box full of chainrings and cogs
to the track, because, to them, it does matter ..

Last edited by fietsbob; 03-14-12 at 11:39 AM.

03-14-12, 12:58 PM   #11
wheelhorseman
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 Originally Posted by norskagent 20" wheels? or frame size?
20in. muscle bike. Just for cruising but we have some light hills in our area.

03-14-12, 01:03 PM   #12
Homebrew01
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 Originally Posted by wheelhorseman I didnt know how to compute the figures. So the 44/16 is the higher ratio correct?? What i am trying to do is decrease the amount of pedal revoultions to go the same speed Is it worth the trouble to change sprockets seeing as how the figures are quite close?
Divide the front chainring by the rear cog. Bigger result = bigger gear.
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 03-14-12, 01:17 PM #13 jimmuller  What??? Only 2 wheels?     Join Date: Apr 2010 Location: Boston-ish, MA Bikes: '73 Raleigh Carlton Gran Sport, '72 Peugeot UO-8, '82 Peugeot TH8, '87 Bianchi Brava, '76? Masi Grand Criterium, '87 Centurion Ironman Expert, '74 Motobecane Champion Team, '86 Gazelle champion mondial, '81? Grandis, '82? Tommasini Posts: 11,382 Mentioned: 67 Post(s) Tagged: 0 Thread(s) Quoted: 374 Post(s) Bigger charinring = smaller cog (rear) = go more distance per pedal revolution = go faster = more force on the pedals. Smaller chainring = bigger cog (rear) = go less distance per pedal revolution = go slower = less force on the pedals. But that's not all you asked. Is that difference significant? Not really. Those ratios are comparable to about 51 and 55 gear-inches on a bike with the more common 700c wheels. That difference is about "one click's worth" on a modern zillion-speed indexed system. You can feel the difference if you are trying to maintain an optimum cadence riding for speed, but otherwise it won't matter one bit. If you are changing your gearing because you are changing your riding style, then you need to reconsider. __________________ Real cyclists use toe clips. With great bikes comes great responsibility. jimmuller