# Classic & Vintage - Gear Ratio Question

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View Full Version : Gear Ratio Question

wheelhorseman
03-14-12, 07:20 AM
Which of the following is the HIGHER gear ratio.

46/18 or 44/16?

norskagent
03-14-12, 07:34 AM
Just do the math - 46/18 = 2.55, 44/16 = 2.75. For gear inches multiply by ~27" 1st = ~69", 2nd = ~74".

wheelhorseman
03-14-12, 07:51 AM
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?

Grand Bois
03-14-12, 08:08 AM
Just get a larger cog.

norskagent
03-14-12, 08:24 AM
no I think he wants a smaller cog.

garage sale GT
03-14-12, 10:01 AM
What i am trying to do is decrease the amount of pedal revoultions to go the same speedI assume you realize the force required will go up in direct proportion to how much the pedal revolutions go down.

Grand Bois
03-14-12, 10:15 AM
no I think he wants a smaller cog.

I think you're right.

wheelhorseman
03-14-12, 11:31 AM
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.

norskagent
03-14-12, 11:33 AM
20" wheels?
or frame size?

fietsbob
03-14-12, 11:34 AM
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 ..

wheelhorseman
03-14-12, 12:58 PM
20" wheels?
or frame size?

20in. muscle bike. Just for cruising but we have some light hills in our area.

Homebrew01
03-14-12, 01:03 PM
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.

jimmuller
03-14-12, 01:17 PM
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.