In general, the Rolex sport watches are heavier than their classic watches. With the exception of the Rolex Sky Dweller, the watches in Rolex’ Classic line tend to be more elegant, no surprise there, so they tend to be thinner cases. Contrastingly, the sports watch line up consists of much thicker models due to their water resistance being superior and their boxier sporty designs. These two elements reflect on more materials being used to construct the watches, hence the weight increase that comes with a Rolex sports watch.
The final element to bear in mind that can massively affect the weight of the watch is the bracelet or strap. A solid gold bracelet weighs a lot more than an Oysterflex rubber strap, however, Rolex are very tactful when it comes to using rubber or solid gold. More often than not you’ll notice the larger solid gold models such as the sky dweller, Daytona and yacht master being offered on an Oysterflex bracelet. But don’t think the watch will be too light, the heavy solid gold case combined with the lighter and comfier material of rubber offer the perfect weight when combined together.