SRAM Red eTap upgrade advice

Regarding #3, keeping 10 speed rear end with 11 speed shifters, it will not work. This VeloNews Tech Fact explains why http://bit.ly/22ipVQI

Yes. Yes. Yes.

Although Campag and SRAM together might look odd.

And the "an otherwise very mid-level set up" - what? Record crankset hardly screams "very mid level", notwithstanding Veloce breaks and Hope wheels. Upper mid level maybe.

Also, maybe OP just wants electronic shifting. Maybe he has internal cable routing that won't take Di2 cables so wireless option is his best bet. Perhaps he'd be delighted with Force or Rival level electronic wireless shifting (I would) but currently option unavailable.

Has anybody done the upgrade yet?

I nearly bought mine this morning, but the shop was sold out within 10 minutes of me receiving a stck alert email...

might be a problem

10 speed Sram chainrings on 11 speed set up do work but are not happy.  The angle of the chain in the bottom two gears is such that the chain grinds the outer face if the small chain ring.

Shimming the inner ring inwards messes up the shifting.

Sounds nice.

I'm (probably) waiting for medium caged rear mechs, so not sue when they'll be available.

I'm no bike mechanic Mike, but I really don't get how this would be an issue. The difference must be pretty minimal, and you would just need to adjust the upper and lower limits.

All of the online reviews are talking about the option of upgrading only the electronic bits (even on non-SRAM setups) and none of them have called out this issue.

Not really sure why you'd want to put eTap on an otherwise very mid-level set up?  Must be better ways of upgrading performance, I would have thought?

I really have no idea if that'll work. My hunch is that it might sort of work, but it'd be a shame if it didn't work perfectly, and I think there's only one way you'll be able to find out for sure if it does or not...

As it happens, I once spent some time planning an upgrade that was going to have a mix of Campag and Shimano mechanical 10 speed groups. I ended up not building it (because it seemed like an expensive experiment if it didn't work out...).

Anyway, here are my thoughts on your quetsions. Bear in mind that I know nothing:

From what I can tell, Campag and SRAM/Shimano 11 speed cassettes have very similar spacing (see http://www.bikerumor.com/2012/12/12/interchange-shimano-campy-11-speed-c...). That means that you could theoretically use your existing Campag 10 speed hub (if it is Campag) to fit an 11 speed Campag cassette (Shimano 10 speed hubs don't take 11 speed cassettes, but Campag ones should do), and run a Campag 11sp chain and your Campag chainset.

As far as I know, Campag double chainsets have similar spacing between the chain rings to Shimano/SRAM. Obviously spacing is not a problem for mechanical shifters, because you just adjust the H/L on the FD to set it all up. Not sure if etap's FD has adjustment, but you'd think it would have. It'd be a real shame if it dropped the chain when you shifted down, or if it rubbed.

Brake levers/callipers would work (they might not feel great if pull ratio is much different, though I'd expect they should be close enough), but the biggest problem would actually be that Campag brake callipers don't have the little lever to release the cable when you want to remove a wheel -- you do that from the brake lever, of course. SRAM RED callipers are expensive, but you might find that SRAM Apex or Force callipers are OK for not too much money.

Not sure if that helps or not -- I know you were hoping for slightly more definite answers, but I'm not sure you'll get any. It's just one of them things. Good luck if you do decide to go ahead!

Also worth mentioning -- expect to get a lot of stick from the Campag style police for mixing SRAM of all things with Campag Record

 Originally I thought yes to all until I came across this is from Dan Lee of SRAM: Ten-speed chainrings can be installed on an 11-speed crank, just as 11-speed chainrings can be installed on a 10-speed crank. The spiders are identical. However, all of our groups are designed to function as complete groups, so if a 10-speed crank is installed in an 11-speed group or vice versa, we strongly recommend changing to the appropriate chainrings. Ten- and 11-speed should not be mixed. Our 22 groups actually have the chainrings slightly farther apart than our 10-speed groups, in order to ensure that all cogs can be safely reached in the small ring, and the chain and front derailleur are specifically designed to work with that gap. Running a 10-speed chain on 11-speed rings or an 11-speed chain on 10-speed rings could cause chain jams or derailments.

Whether the aforementioned applies also to eTap your best bet is to get the answer directly from SRAM https://www.sram.com/contact .