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A Guide on Curved End Watch Straps
The lug gap problem
Most leather and rubber straps leave a small gap at the lugs, and while it may seem minor at first, it quickly becomes something you cannot ignore once you notice it. That small empty space between the strap and the case can make an otherwise well designed watch feel slightly incomplete. On sport models with strong lines and solid endlink bracelets, the effect is even more obvious because the original bracelet was designed to sit tightly against the case, creating a seamless transition that a standard strap often cannot replicate.
This is particularly noticeable on watches like the Rolex Submariner and the Tudor Black Bay 58, both of which were designed with integrated looking bracelets that hug the case closely. When you remove the bracelet and install a standard straight end strap, the strap sits between the lugs but does not follow the curve of the case. From certain angles, light passes through the gap, and sometimes the spring bar becomes visible, breaking the visual flow and drawing attention to what feels like a missing piece.
Why the gap happens
The reason this happens is simple and largely due to how most aftermarket straps are produced. The majority are made with straight ends so they can fit a wide range of watches that share the same lug width. A 20mm strap, for example, can fit dozens of different models across different brands, which makes it practical from a manufacturing standpoint but less precise from a design perspective.
Every watch case has its own geometry. The curvature of the lugs, the distance between the spring bar and the case, and the thickness and slope of the case all vary from model to model. A universal straight end strap cannot account for all of these subtle differences, so a gap is often unavoidable. For some owners this does not matter, but for others who care about proportion and finishing, that empty space can be frustrating.
Curved end rubber straps
For certain popular models, curved end rubber straps provide a clean and effective solution. Instead of finishing in a straight line, these straps are molded to follow the contour of the case, allowing them to sit flush against the watch head and reduce or eliminate the visible gap.
We offer curved end rubber straps specifically for the Rolex Submariner, the Tudor Black Bay 58, and the Tudor Black Bay 41mm with 22mm lugs. Each strap is shaped to match the case it is designed for, ensuring that the transition from case to strap looks natural and integrated rather than forced. When viewed from above, the strap appears to flow directly out of the case, creating a cohesive silhouette that feels intentional.
Beyond improving aesthetics, a properly fitted curved end strap can also enhance stability on the wrist because it sits closer to the case and reduces unnecessary movement around the spring bar.
Endlinks for greater variety
Not every watch has a dedicated curved rubber strap available, especially models with more complex case shapes such as the Rolex Daytona and the Rolex GMT Master II. For these watches, endlinks offer a practical and versatile alternative that fills the gap while maintaining compatibility with most regular straps.
Endlinks are metal components that sit between the lugs and follow the profile of the case on one side, while allowing a standard straight end leather or rubber strap to attach on the other. By bridging the space between the case and the strap, they create a cleaner, more integrated appearance without limiting you to a single watch specific strap design.
We currently offer endlinks for the Tudor Black Bay 41mm in both 21mm and 22mm lug widths, the Tudor Black Bay 58, the Rolex Submariner, the Rolex Daytona, and the Rolex GMT Master II. With these in place, most leather and rubber straps can be installed while maintaining a flush look at the lugs, giving you the freedom to experiment with different materials, textures, and colours without compromising the overall aesthetic.
The real advantage of endlinks is flexibility. You are no longer restricted to one molded rubber strap but can rotate between leather, rubber, or other materials depending on the occasion, all while preserving a cohesive case to strap transition.
Using the original endlinks
Another option that many owners overlook involves reusing the original endlinks, particularly on models with female endlinks or universal endlinks like the Daytona's. These endlinks allow custom straps to fit as they can be separated from the rest of the bracelet, or is a standalone piece in the case of the Daytona.
By carefully cutting a leather or rubber strap to fit into these original endlinks, you can retain the factory engineered metal component while introducing a different strap material. This approach requires precision, as the strap must be trimmed accurately to ensure a secure fit, but when done correctly, it offers one of the cleanest integrations possible because it uses the same endlink design that the brand intended for the watch.
This method keeps the structural integrity and visual continuity of the original bracelet while allowing for personalisation, combining the best of both worlds for owners who want a tailored result.
What we offer
For curved end rubber straps, we currently support the Tudor Black Bay 41mm with 22mm lugs, the Tudor Black Bay 58, and the Rolex Submariner. Each version is shaped specifically for its intended model to minimise gaps and improve overall fit.
For endlinks that work with most leather and rubber straps, we support the Tudor Black Bay 41 millimetre in 21 and 22 millimetre lug widths, the Tudor Black Bay 58, the Rolex Submariner, the Rolex Daytona, and the Rolex GMT Master II. These endlinks are designed to fill the gap while preserving compatibility with a wide variety of strap styles.
Final thoughts
A strap should feel like it belongs on the watch rather than looking like an afterthought. When there is a visible gap at the lugs, even a small one, it can subtly disrupt the harmony of the design. Addressing that detail transforms the overall impression, allowing the case to flow naturally into the strap and restoring a sense of completeness.
Whether you choose a curved end rubber strap for a model specific fit, use metal endlinks to unlock greater versatility, or adapt the original female endlinks for a factory inspired integration, the goal remains the same. A cleaner transition, a more cohesive silhouette, and a watch that looks just as considered off bracelet as it does on it.
