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Old 02-17-18, 11:52 PM   #1
Godspeed7
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Gear ratio

Any one know a good gear ratio for riding in hilly areas on a fixed /single speed?
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Old 02-26-18, 03:33 PM   #2
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You say little how steep, what hill?, how strong are you, what have you tried so far..

Math..
Rear cog T divides front chainring T .... example 20 cog 40 chainring is 1:2, 1 rotation of the crank turns the wheel twice.

then measure your wheel size .. inch diameter .. 2:1 x 27" = a 54" gear ..

that is the math, remember that from school?


A hill, like stairs have measurements ... distance traveled, elevation gained.. that too can be expressed as a ratio.

so how steep/ hilly, ? and what gear? have numbers to define them..






....

Last edited by fietsbob; 02-27-18 at 06:10 PM.
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Old 02-26-18, 04:05 PM   #3
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BikeCalc.com - Fixed Gear Calculator
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Old 02-26-18, 04:11 PM   #4
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bicycle e-tools: percent grade, average speed calculator, gear-inch chart
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Old 03-30-18, 05:43 PM   #5
Dean V
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77" works for me. As long as the hills are less than a mile long and under 10%.
It is also very dependant on your weight, fitness, pedalling preference.
Trial and error is really the only way to find what suits you.
Also fixed you will probably want a bigger gear than single speed as you can't coast on the downhill.
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Old 03-30-18, 07:32 PM   #6
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https://www.velodromeshop.net/gearchart3.jpg
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Old 03-30-18, 07:58 PM   #7
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I can't see how gear charts, calculators etc help.
It is a balancing act between how big a gear you can push up the hills and how fast you can spin down them.
No calculator will tell you that.
You just have to try it out. A handful of different rear sprockets is not that expensive.
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Old 04-08-18, 04:48 PM   #8
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Thanks for the info.
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Old 04-08-18, 04:53 PM   #9
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Quote:
Originally Posted by Dean V View Post
I can't see how gear charts, calculators etc help.
It is a balancing act between how big a gear you can push up the hills and how fast you can spin down them.
No calculator will tell you that.
You just have to try it out. A handful of different rear sprockets is not that expensive.
Thanks for the advice! 😀🚵💨💨💨
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