amadeus88

The merchant bike24 (search for Deore Trekking GroupSet T6000) lists the CS-HG500-10 cassette 11-34T as "not compatible with 3-speed cranks". I can't find any mention of this restriction on the Shimano website. (Sorry no links allowed yet.)

The trekking crankset is FC-T6010 (3x10). In the trekking series there is no separate cassette so presumably intended to share with the M6000 series. The trekking series does not have a 2x10 crankset.

The combinations: 11-25T 11-32T 12-28T do not have this restriction. Why would 11-34T be incompatible?

Shimano Europe Bike News had this blurb: "The 10-speed rear derailleur (RD-T610) on the other hand offers a trekking-tuned spring for light and smooth shifting on all sprockets. The SHADOW design echoes other Shimano rear derailleurs with a low profile shape and single tension construction that does not hit the chain stay in rough riding conditions. The rear derailleur can accommodate a total capacity of 45T with the CS-HG500-10 cassette in 11-34T, 11-32T or 12-28T providing the optimum pairing."

tyrion

Utter nonsense (or, more likely, some kind of typo error).

ThermionicScott 

You’ll note that 11-34 has the biggest tooth difference (23t). Assuming that a triple usually has a 20t difference between the biggest and smallest ring, your rear derailleur would need 43 teeth of capacity. Maybe Shimano doesn’t offer one with that much, and they’re trying to steer users away from building a system that could have problems on the road.

There’s no law stopping you from building up a triple with an 11-34, but you would need to make absolutely sure that the chain is long enough for the big-big combination, and there are likely a few gear combinations involving the granny ring and small cogs that won’t be useable because the chain will be completely slack. 😊

amadeus88

Thank you!

It probably is a merchant error: The restriction should apply to the 11-25T and 12-28T cassettes.

The current RD-T6000-SGS has 32T <= Low sprocket <= 36T which is compatible with 11-32T, 11-34T.
The older RD-T610-SGS is 28-34T which is compatible with 12-28T additionally (per the Shimano blurb).

In any case the current T6000 groupset would not work with the smaller cassettes(11-25T, 12-28T).