Campagnolo 12 speed cassette compatibility

Discuss light weight issues concerning road bikes & parts.
talltales
Posts: 118
Joined: Mon Mar 11, 2019 10:43 pm

by talltales

fehguy wrote:
Sat May 23, 2020 6:17 pm
Hi folks, for those who are interested, I have a 3,000 mile (sorry! 4828 km) update.

First off, shifitng is still perfect. I have never, ever, ever once thrown a chain or had a missed shift. That is miraculous! It is quiet and works beautifully.

Next, the SRAM chain has a MUCH longer life than my old 11speed Campy ones. How do I know? Well, I've become accostomed to changing my chain every 2000 miles (cough 3218km, I'm not doing this anymore!). Each time, I'll lay the old campy chain out next to the new one and look at stretch. Typically it's about 1/4 of a link of stretch (I've done this 5 times now) with the Campy 11 speed chain. The SRAM after 2000 miles was virtually unchanged. I have photos of each of the chains showing their stretch. It's not the most scientific approach but I can say that it has been consistent, and the SRAM chain was remarkably unchanged. I'll start replacing it every 3500 miles instead of 2000.

Finally, I have been so happy with the setup that I splurged on my cross bike, and put on a 10-33 SRAM 12-speed cassette with Super Record shifters and a Chrous super-compact 48-32 crankset. It works just as well.

So while I feel a bit like a heratic running the SRAM cassette and chain on Campy, it is working great. I hope this is helpful to someone!
1/4 link vs the full chain?

A full road chain is about 114 links, give or take. 1/4 link elongation only amounts to 0.22%. Imo there is still some life left in it, unless the rollers are shut.

Not sure what the current prices are, but the cost per mile might be similar even if one (expensive) chain last much longer than the other. A axs red chain would have to last a long time to come down to a resonable $/mile ratio.

by Weenie


DaveS
Posts: 2909
Joined: Fri Mar 24, 2006 1:26 pm

by DaveS

fehguy wrote:
Sat May 23, 2020 11:55 pm
@DaveS I do quite a bit of climbing, 500k ft/year. Maybe that's what is eating my chains. I do keep things clean and lubed, it's definitely not mechanic abuse that's wearing them out.

I started replacing chains more regularily after I wore out my entire drivetrain at 4k miles. Chain broke twice in one day, the chainrings (Campy Super Record 11 OEM) had "shark fin" teeth and it was really expensive. The chain had enlongated an entire 1/2 link (pin-to-pin).
I live in Colorado and also climb a lot. I weigh about 140 lbs, so I probably put less tension on the chain, but I also spend a lot of time in my 32T little ring, that produces more tension.

If I report chain elongation, I do it by percentage or a length increase in inches. A link is .5 inches, not 1 inch. For a typical 55 inch or 110 link chain, .5% is a length increase is .275 inches or just over half a link.

If you think that a link is 1 inch and "an entire 1/2 link is 1/2 inch, then you're talking about nearly 1% elongation, which is far too long to use any one chain. That's an example of poor maintenance.

I use several chains in a rotation and would measure both elongation and roller wear to decide when to toss a chain. When several chains are in use, your cassette and chain rings should all last for the life of all of those chains.

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