Rolex Oysterflex Sizing Guide

First introduced in 2015 on the Everose gold Yacht-Master, the Rolex Oysterflex is unlike anything else in the Swiss brand’s catalog, and its innovative design blurs the lines between a metal bracelet and a rubber strap. However, sizing for the Rolex Oysterflex works a bit differently than what you will find among other straps and bracelets, as its flexible structure is entirely devoid of links and sizing holes for adjustments. Highly desirable yet often misunderstood, the Oysterflex is very much a unique creation, and below is everything you need to know about sizing for the Rolex Oysterflex bracelet. 

What Is the Rolex Oysterflex Bracelet?

At first glance, the Rolex Oysterflex simply looks like a black rubber strap, although it actually represents a highly technical design that combines the comfort of a rubber strap with the durability of a metal bracelet. Each side of the Oysterflex consists of a thin metal core that is crafted from a flexible titanium-nickel alloy coated in black elastomer. The two ends connect on the underside of the wrist with one of Rolex’s industry-leading folding clasps, and the interior surfaces of the elastomer-coated sides feature unique raised structures that increase comfort by promoting airflow, while simultaneously helping keep the watch centered on the wrist. 

Without knowing about the Oysterflex’s metal core, most people would assume that its sides are crafted entirely from some type of rubber, as it is both lightweight and incredibly supple. However, unlike traditional rubber straps that can crack or tear after extended use, the Rolex Oysterflex uses metal throughout the entirety of its structure, which provides it with superior longevity and a more durable overall design. Due to the fact that it has a metal core, Rolex considers the Oysterflex to be a bracelet, but you will frequently hear collectors refer to it as the “Oysterflex strap” simply because it more closely resembles a rubber strap than a traditional link-based bracelet.

What Rolex Models Have the Oysterflex?

The Oysterflex bracelet would perfectly complement Rolex’s rugged purpose-built tool watches; however, the Swiss brand considers the Oysterflex to be a premium offering, and at the time of writing, you will only find Oysterflex bracelets on solid 18k fold versions of the Yacht-Master, Daytona, and Sky-Dweller. While the Oysterflex originally debuted on the 18k Everose gold versions of the Yacht-Master 40 (ref. 116655) and Yacht-Master 37 (ref. 268655), it later replaced the leather straps on Rolex’s solid-gold Daytona and Sky-Dweller models in 2017 and 2022, respectively.

Below is a list of all the current-production Rolex models that are available with the Oysterflex bracelet (as of July 2025).

Rolex Oysterflex Yacht-Master Watches

• Yacht-Master 37 ref. 268655

• Yacht-Master 40 ref. 126655

• Yacht-Master 42 ref. 226658

• Yacht-Master 42 ref. 226659

Rolex Oysterflex Daytona Watches

• Daytona ref. 126518LN

• Daytona ref. 126538TBR

• Daytona ref. 126515LN

• Daytona ref. 126535TBR

• Daytona ref. 126519LN

• Daytona ref. 126589RBR

• Daytona ref. 126539TBR

Rolex Oysterflex Sky-Dweller Watches

• Sky-Dweller ref. 336238

• Sky-Dweller ref. 336235

• Sky-Dweller ref. 336239

In addition to the 2025 models listed above, you may also encounter other Rolex references equipped with the Oysteflex bracelet, such as the discontinued Yacht-Master 40 ref. 116655, or lavish off-catalog models like the diamond-set Yacht-Master 42 ref. 226679TBR and rainbow-bezel Yacht-Master 40 ref. 116695SATS that were only offered to Rolex’s top VIP clients and never formally listed on the brand’s official website.

How Do Sizes Work for the Rolex Oysterflex?

Unlike other Rolex bracelets that can be sized by adding or removing links, each side of the Oysterflex is a single piece of elastomer-coated metal, and Rolex therefore produces multiple different sizes to accommodate the wrists of different owners. The width of the Oysterflex is determined by the lugs of its corresponding model (18mm Yacht-Master 37, 20mm for the Yacht-Master 40 and Daytona, and 21mm for the Sky-Dweller), although each of the two sides (12 o’clock and 6 o’clock) is available in six different lengths, which are designated by letter codes that range from C to H.

The letter codes for the Rolex Oysterflex bracelet correspond to the distance between the springbar and the connection point for the clasp, with “C” being the smallest and “H” representing the largest. With that in mind, the two sides of the Oysterflex only account for part of its total circumference, and you must also factor in the additional length of the watch case and its clasp when determining which Oysterflex size you need for your Rolex. 

Below is a list of the Rolex Oysterflex bracelet letter codes and the various different lengths that correspond with them. 

• C: 1.57 inches (4cm) 

• D: 1.77 inches (4.5cm) 

• E: 2.16 inches (5.5cm)

• F: 2.56 inches (6.5cm) 

• G: 3.05 inches (7.75cm) 

• H: 3.54 inches (9.0cm) 

Rolex Oysterflex Sizing Information

Since Rolex models have different cases, the combination of Oysterflex sizes you require may slightly differ from one watch to the next. For example, you will need a shorter Oysterflex bracelet for a Sky-Dweller than a Yacht-Master 37, simply due to the fact that the Sky-Dweller has a substantially larger case. 

If you look at the recommended Rolex Oysteflex sizing charts for the Yacht-Master and Daytona below, you will notice that the exact same combination of Oysterflex codes correlate to slightly different wrist sizes. For instance, if a person has a wrist that measures 6.5 inches in circumference, they will require a pairing of “E” and “F” Oysterflex sizes if they have a Yacht-Master, while they will need a size “D” and “F” pairing if they have a Daytona.

Rolex Yacht-Master Oysterflex Sizing Chart

Rolex Daytona Oysterflex Sizing Chart

How to Size the Rolex Oysterflex Bracelet

Since the flexible elastomer-coated sides of the Rolex Oysterflex bracelet cannot be adjusted, the only way to shorten or lengthen it is by using the extension system that is built into its clasp. All of Rolex’s current-production Oysterflex models come equipped with the brand’s Glidelock clasp, which provides too-free access to incremental levels of adjustment. That said, Rolex’s Glidelock extension is primarily intended for owners to fine-tune the fit of their watches, and if an Oysterflex bracelet requires a significant amount of adjustment, the only way to substantially alter its length is to purchase new side sections, which are only available from Rolex.

It is also worth noting that Rolex will not sell replacement Oysterflex parts unless it can verify that the individual owns the correct watch that corresponds with them. For example, someone who has a stainless steel Daytona isn’t able to purchase an Oysterflex bracelet for their watch, despite the fact that Rolex produces Oysteflex components that would be compatible with its case. However, those who own an Oysterflex-equipped model and simply need a replacement or a different size can walk into any authorized retailer or service center and place an order for whatever part they require. Regardless of whether you consider it to be a strap or a bracelet, the Oysterflex is a fascinating piece of engineering, and it is a truly innovative design that is entirely unique to Rolex.