Pinoy Rock drummer:
Vic Mercado, former drummer of Bamboo told me before that he preferred 18'' or larger diameter Crash Cymbals for better reach.
But contrary in the case of a Ride Cymbal which has a standard size of 20'' or bigger, he opt for a smaller diameter. That is because with the same reason as well. Smaller diameter Ride Cymbal make you easily reach its Bell which is very important in its characteristics. Specifically it is a Zildjian K Custom 18'' Session Ride, designed by renowned session drummer Steve Gadd.
But after they disbanded last 2011, he also changes his drum set setup even the cymbals setup as well. He's often seen using Zildjian Constantinople Ride which is well known in having a larger diameter, a Hi-hat, and one Crash Cymbal. A different setup from what we usually see in his Bamboo days which has tons and various cymbals.