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Necessary Cassette Ranges...
Based on the 42-32-22 3x chainring used with an 11-13-15-18-21-24-28 7s cassette which I used to ride 20 years ago, I have deduced that:
500% (9-45T) is all that is needed with a round chain ring…
445% (9-40T) is all that is needed with Oval Chain Rings(with +\-2T deviations)…
400% (9-36T) is all that’s needed with Dual Cam chain rings(with +4/-3T deviations found with Carbon-Ti X-SyncroCam Chainrings)…
Points to Note:
1. Larger than 45T cassette cogs are NOT necessary in the bike industry…
2. Oval & Dual Cam chain rings also EXTEND THE RANGE of a drivetrain, negating the need for a cassette(intended for a 1x setup)to have a range greater than 445%…
3. A 36T/40T/45T max cog limit allows for smaller derailleur cages which will be less prone to damage from random obstacles on the trail...
4. Any potential inefficiency from a 9T cog should be acceptable, as said cog will only be in use whilst riding down hill\with the aid of gravity(in most cases)...
5. 9-45T cassettes will be - you guessed it - lighter, but more importantly, the potential weight savings, can allow for said cassettes to be COMPLETELY made of Steel, increasing durability...
6. The Gear Inches of the bike in the granny gear should be adjusted to match(or as close as possible)that if a 26x2.1 wheel - 20.70 - as calculated on this site: https://www.bikecalc.com/gear_inches
500% (9-45T) is all that is needed with a round chain ring…
445% (9-40T) is all that is needed with Oval Chain Rings(with +\-2T deviations)…
400% (9-36T) is all that’s needed with Dual Cam chain rings(with +4/-3T deviations found with Carbon-Ti X-SyncroCam Chainrings)…
Points to Note:
1. Larger than 45T cassette cogs are NOT necessary in the bike industry…
2. Oval & Dual Cam chain rings also EXTEND THE RANGE of a drivetrain, negating the need for a cassette(intended for a 1x setup)to have a range greater than 445%…
3. A 36T/40T/45T max cog limit allows for smaller derailleur cages which will be less prone to damage from random obstacles on the trail...
4. Any potential inefficiency from a 9T cog should be acceptable, as said cog will only be in use whilst riding down hill\with the aid of gravity(in most cases)...
5. 9-45T cassettes will be - you guessed it - lighter, but more importantly, the potential weight savings, can allow for said cassettes to be COMPLETELY made of Steel, increasing durability...
6. The Gear Inches of the bike in the granny gear should be adjusted to match(or as close as possible)that if a 26x2.1 wheel - 20.70 - as calculated on this site: https://www.bikecalc.com/gear_inches
Author Info:
Member since May 26, 2016
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