Which Groupset?

The new rings on my new Zayante's are right good. Shift just as quickly if not faster than Shimano rings. Could be perception but they are great on first impression.

Mechanical groupset, yep? I've mostly had problems with Praxis rings and Di2.

Interesting that group type could make a difference. But yep, mech.

What sort of problems?

Shimano made stiffer rings to deal with DI2. I've used Praxis for a shitload of miles though and they mostly work fine. I a weird chainsuck incident in one of the TransAms but that was resolved with a punch and I I might've not had a Praxis outer on at that stage but a 46T from some other manufacturer.

Oh yeah, I meant a double and a 10t driver. MOOOAR

Chain dropping off the rings at both extremes. The FD was adjusted correctly.

I might've not had a Praxis outer on at that stage but a 46T from some other manufacturer

Praxis are keen to point out that their rings must only be used in pairs. But then... they would say that, wouldn't they? They also say they are the only mnfctr than Shimano to drop-forge their rings. So they last well, even if opinions vary on shift quality.

I see. I'm rarely pushing hard enough on descents these days to need even the 11t.

The FD was adjusted correctly

That's what they all say :P

Cage wasn't bent or was something flexing that would allow the chain drop even though it appeared limited correctly in a workstand? Seems an odd one to happen in both directions. What sort of frame? Not old steel or cheap carbon? You weren't running some super RD cage that had really slack springs like a CeramicSpeed hanger?

They do seem pretty durable. If it makes them feel better I did buy their rings in pairs and then I swapped out the big ring for a littler big ring from someone else :)

I've destroyed an ultegra di2 rear mech, I think a spoke broke and took it out (including damaging the frame, so generally a good days work).

I'm running a 32 already and was thinking about doing some more adventurous rides when I get it all back up and running) - is there any reason not to get the grx mech instead of like for like?

As far as I can see it would limit me to a smallest gear of between 30 and 34 but I'd get a clutched mech which might be good for bumpy stuff - is that about the size of it?

Nope, Cervelo and Brommers Bikes double oversized tubing steel frame, standard RDs in both cases. No further issues after I fitted Rotor chainrings, and the Praxis rings have worked fine with a mechanical DA9000 groupset (except for the crankset - SISL2 crank arms with a P2M spider) after I'd removed them from one of the Di2 bikes. Makes absolutely no sense, I know, but there it is.

You can get ultegra RX Di2 for a shorter cage. I doubt there is any difference

How much is the GRX RD?

I paid £155 for my second shadow di2 RD (RD-R8050 GS cage) last year.

Were the Rotor rings the same size?

Seems like that same rear derailleur is about £175 now - https://www.probikekit.co.uk/bicycle-derailleurs/shimano-ultegra-di2-r8050-e-tube-rear-derauilleur-shadow-design/11465221.html?affil=thggpsad&switchcurrency=GBP&shippingcountry=GB&variation=11465223&shoppingpid=TOP10_020318_&gclsrc=aw.ds&&thg_ppc_campaign=71700000008963581&gclid=CjwKCAjwr7X4BRA4EiwAUXjbt345CVGF9C-NFO-mrT5oO6I5vQtsCarU9Z_WHuBo4d1W4L5tH6KV-BoCLBcQAvD_BwE

Or

EUR 201 for the GRX

https://www.bike24.com/p2322817.html

They're £250 now from where I paid £155. Ouch!

Bloody exchange rate.

Maybe I should stockpile them before it gets worse... Or at least try not to destroy any more of them

I've got a nice little shopping bag full of dead or half dead Di2 parts. Most of them killed by drivers. #nowonderimlookingatoffroad

moneygun.gif

Worst thing is I don't know what I did wrong, or even what happened. I think it was a spoke snapping that took out the derailleur, but it could have been derailleur just breaking and then taking the spoke out...

In either case who knows why. Divine retribution for something maybe

Yep. All 50/34. Like I said, it makes no sense at all. Could be just one of those things, but it happened repeatedly despite me checking a re-checking the FD setups.

If the RD wasn't adjusted right or had been knocked so it went out of adjustment it could've taken out the spoke. Normal use shouldn't have an RD in the back wheel, obvs.

It could have taken a knock actually, I have a marauding toddler who has been quite interested in the bike... Had thought all was fine but that is a more plausible theory than the spoke explosion taking out the whole rear end.

Happened multiple times and you checked FD setup in between, all I can think of is an issue with the BB (but you didn't swap that?) or the rings themselves - is it possible to install them backwards or something? I can't remember. I think there's plenty of writing on them telling you which way to install them so unless you were drunk every time you checked? :)

Anyway, I've run Praxis rings or at least one Praxis ring for most of my TCRs and stuff and I only remember the one weird thing in the US and that wasn't an under/overshifting thing it was probably gunk on the ring or a hard bump at the same time as a shift that I didn't hear to 'catch' while pedaling.

Maybe you got unlucky? I'll take them off you. :)
I had a carbon ring on the TT bike that never worked properly and totally failed during the Nat 24. They replaced it but we never did get to the bottom of the problem. Other carbon rings from the same guys worked just fine. I still have the BNIB replacement. Think it's a 51T.

...so the next Q is whether the GRX would be more resistant to knocks!

Shimano blurb suggests it's further swung under the cassette so should be safer. In theory....