Chainrings v cassette
#1
Senior Member
Thread Starter
Join Date: Aug 2015
Location: Keighley, Uk
Posts: 195
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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
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
#2
Banned
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..
Can you do simple Maths ? Tooth count rear its turned by tooth count front in a proportion known as a Ratio..
#3
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,964
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 124 Post(s)
Tagged: 1 Thread(s)
Quoted: 4361 Post(s)
Likes: 0
Liked 21 Times
in
21 Posts
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
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
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
#4
Senior Member
Thread Starter
Join Date: Aug 2015
Location: Keighley, Uk
Posts: 195
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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
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

#5
Senior Member
Thread Starter
Join Date: Aug 2015
Location: Keighley, Uk
Posts: 195
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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
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

#6
Some Guy on the Road
Join Date: Jan 2015
Location: 614
Posts: 423
Bikes: Foundry Chilkoot, Trek Domane
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Likes: 0
Liked 2 Times
in
1 Post
Or, if you'd like the internet to do the maths for you, just use this gear calculator!
HTML5 Gear Calculator
HTML5 Gear Calculator
#7
Banned
'Sheldon Gears' works well, too... Sheldon Brown's Bicycle Gear Calculator