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 
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.. 
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 
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 :( 
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 
Or, if you'd like the internet to do the maths for you, just use this gear calculator!
HTML5 Gear Calculator 
'Sheldon Gears' works well, too... Sheldon Brown's Bicycle Gear Calculator

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