2nd hand C60 with SR EPS.
Anyone have experience buying second hand electronic shifting and what to look for?
Besides the obvious, it can shift smoothly in all gears.....I might be able to test ride it for 'under load shifting'.
If it's RE / SR v1 (external PU) I'd perhaps be cautious of the PU if it doesn't have S2D engraved / lasered on the end of the unit - relatively early ones were absolutely fine and those with S2D on were likewise fine but there was a short bad patch of production between that were a bit hit and miss - impossible for a consumer to tell from the outside which were the OK and which were the maybe not OK v1 PUs. We can only tell from the serial numbers, by checking with the factory.
By-the-bye, all the Athena v1 PUs were fine in this respect - they were not labelled as such but were all S2D-type.
If you can, try a charge ... you want to see a charge cycle of around 4 hours from flashing red LED on battery check (almost flat) - if you have, say, a flashing green LED on battery check, you need to see what the charge time to charge-LED-out on the charger (full) is ... should be 90 - 120 min. If it's significantly less & if the charger gets more than mildly warm during that charge, it may indicate an under-volted battery (improper storage / charging routine) which is not recoverable.
You might need to come to an arrangement with the seller to test this - but if (s)he has nothing to hide, they won't object.
The derailleurs themselves are pretty robust as are the levers and the Interface unit. Just look for obvious signs of the RD having been dropped and look for any evidence of a small "bite mark" on the back of the RD at the point that would impact the gear hanger if the RD were to be rotated hard clockwise around the top pivot bolt. If that has happened by whatever cause, it can indicate that the TPB housing has been stressed in a way that may lead to failure.
Check that the bonded-on insert on the inside outer cage plate of the FD is there and intact. If the original owner has been one to aggressively downsihift under full gas or has used a master-link or non-Campag chain, this insert can be damaged and the cage will need replacing to get a satisfactory FD shift back. That's a Service Centre-only job as a specially designed arbour press is needed to do the job without the risk of damage to the derailleur linkages.