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-   -   Chainrings v cassette (https://www.bikeforums.net/general-cycling-discussion/1089609-chainrings-v-cassette.html)

nightshade18 11-26-16 01:00 PM

Chainrings v cassette
 
Hi,

How does a tooth on the front compare to a tooth on the back?

I swapped my 28t cassette for a 30t, but now I'm thinking of changing my 36t chainring out for a 34.
Will 2 teeth less on the front give an equal reduction in gearing to my experience of adding 2 teeth to the cassette?

Thanks

fietsbob 11-26-16 01:30 PM

There are Different toothing Profiles for Both... But The Pitch standard is 1/2"

Can you do simple Maths ? Tooth count rear its turned by tooth count front in a proportion known as a Ratio..

FBinNY 11-26-16 01:41 PM

Think in terms of percentage change. The percentage effect is the same front or back except in opposite directions.

So adding 2 teeth to 28 is 1/14th or roughly 7%. subtracting 2 from 36 is 1/18th or a roughly 5.5%%. So the effect of changing the ring is slightly less than what you got changing the cassette

nightshade18 11-26-16 01:43 PM

I don't understand what you're trying to say.

My question was: is the reduction of 36:28 to 36:30 equal to the reduction of 36:30 to 34:30. Yes, I can do simple maths. No, I don't understand if the reduction is equal.
Sorry if I'm not up to standard :(

nightshade18 11-26-16 01:45 PM


Originally Posted by FBinNY (Post 19214641)
Think in terms of percentage change. The percentage effect is the same front or back except in opposite directions.

So adding 2 teeth to 28 is 1/14th or roughly 7%. subtracting 2 from 36 is 1/18th or a roughly 5.5%%. So the effect of changing the ring is slightly less than what you got changing the cassette

Thanks - that was the kind of thing I was looking for :)

Wittyname 11-26-16 02:07 PM

Or, if you'd like the internet to do the maths for you, just use this gear calculator!

HTML5 Gear Calculator

fietsbob 11-26-16 02:32 PM

'Sheldon Gears' works well, too... Sheldon Brown's Bicycle Gear Calculator


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