42x16 the same as 46x18?
10-26-08 | 05:13 PM
#1
Thread Starter
Just Do It !
Joined: Jun 2004
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From: United States
Bikes: Litespeed Ti, Trek Carbon.
42x16 the same as 46x18?
Ok showing my stupidity, but I wondered if these two gear combos were the same since they were both two apart on each. thanks
I would guess they are the same..
I would guess they are the same..
10-26-08 | 05:17 PM
#4
Senior Member
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From: Vancouver, WA, USA
Bikes: Surly Crosscheck, Surly Pacer
They aren't identical, but they are close. 46x18 is 67.4 gear inches. 42x16 is 69.2.
Check out: Sheldon Brown's Gear Calculator
Check out: Sheldon Brown's Gear Calculator
10-26-08 | 05:23 PM
#5
Senior Member
Joined: Jun 2002
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From: San Jose, CA
Bikes: Too many bikes, too little time to ride
47x18 would be closer. also your logic is flawed; it's a ratio so you need to divide between chainring and cog, not add/subtract. adding 2 teeth front and back does not preserve the same ratio. https://software.bareknucklebrigade.c...it.applet.html is what i use.
