Campagnolo Cogs
12-18-12 | 07:20 AM
#1
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Campagnolo Cogs
I was looking up Campy Cogs and I came across 12TA-1P, and 12TA-2P. I think I know what the A designation is [I'm pretty sure it means how many teeth the chain can jump], but what is the 1P/2P designation. Again, just curious. Thanks for any info...
Joe D
Joe D
12-18-12 | 07:27 AM
#2
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1st position or second position?
The TA sounds more like 12 Teeth Aluminum??
Correction, the A is the position, the teeth are cut in a different way and in campy cassettes you have A, B and C position... low/middle/high in the cassette.
The difference IMO between 12TA-1P, and 12TA-2P is that the 1st one is for a cassette starting in a 12 and the second is a cassette starting in 11 so the 12 is second Position.
The TA sounds more like 12 Teeth Aluminum??
Correction, the A is the position, the teeth are cut in a different way and in campy cassettes you have A, B and C position... low/middle/high in the cassette.
The difference IMO between 12TA-1P, and 12TA-2P is that the 1st one is for a cassette starting in a 12 and the second is a cassette starting in 11 so the 12 is second Position.
Last edited by ultraman6970; 12-18-12 at 07:34 AM.
12-18-12 | 11:43 AM
#3
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From: Mountain View, CA USA and Golden, CO USA
Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs
On Campagnolo brand cogs the letter 'A' indicates how the shift ramps and truncated teeth are oriented rotationally with respect to the mounting splines (since the introduction of 8 speed Exadrive there's been only one way to install cassettes).
Different cog combinations shift best when the correct sequence is used. For instance, there's 21A cog after the 16A-17A-19A sequence; 21C which follows the 18C-19C combination; 21D behind 20D; and a 21G flavor which continues 15A-17G-19G.
I followed a 13A first position cog in the 8 speed era with a 14B and noted sluggish shifting compared to the correct 13B-14B or 13A-14A combinations but couldn't say how that works now.
Different cog combinations shift best when the correct sequence is used. For instance, there's 21A cog after the 16A-17A-19A sequence; 21C which follows the 18C-19C combination; 21D behind 20D; and a 21G flavor which continues 15A-17G-19G.
I followed a 13A first position cog in the 8 speed era with a 14B and noted sluggish shifting compared to the correct 13B-14B or 13A-14A combinations but couldn't say how that works now.
Last edited by Drew Eckhardt; 12-18-12 at 01:42 PM.
