Furthermore: (i love responding to myself)
I found this on cycling news: It's about the Proracer Carbon, not Chrome, not sure if I can assume they are the same cleat-wise. Anyhow, what the hell does this mean?
"Let's start at the sole, which is made from carbon-reinforced nylon, but with what Diadora calls the "Multiped" system, but what we all call "cleat inserts" that are screwed into the sole of the shoe.
Given that nearly all shoe manufacturers have adopted the 3-hole pattern introduced by Look (even Carnac has abandoned inserts in 2005 range and opted for a complete sole), Diadora remains one company that can still offer a wide range of pedal compatibilities.
This could be good news to those owners of Shimano's popular SPD and the improved SPD-R pedals. For early-adopters of the SPD and SPD-R, it's more than likely the pedal is still quite functional but the shoes are on the way out, if not replaced already. Indeed, the SPD-R is still favoured by many track cyclists for its secure retention strength. However, the design has been discontinued by Shimano, disappointing many current owners as the petite pedals have proved extremely robust.(In fairness to Shimano, the company claims that SPD-R pedals practically stopped selling when the SPD-L became available, even though they were both available for a while.)
Adding the cleat insert facility, however, also increases the stack height, that is, the distance between the ball of your foot and the pedal axle. The widely held belief is that "closer is better", and I found that I had to increase the saddle height 3-4mm when changing over from thin, single-piece carbon fibre soled-shoes to the new Diadoras.
The profile of the sole is not as flat as other Italian brands, but not as stepped as the high-end French-made shoes; somewhere in-between, is how I'd put it. The shoes were tested with 3-hole, Look-compatible inserts, each attached by two Allen screws. The cleats are then screwed into these inserts using whatever fasteners your pedal-maker supplied. In this case, they were tested using Campagnolo pedals/cleats and the aft adjustment provided by the positioning of the female threads in the cleat insert will be more suited to those riders who've not had to jam their cleats all the way back to position their feet in the ideal ergonomic position."