Bell & Ross BR 05 Chrono Black Steel · Ref. BR05C-BL-ST/SST · 24mm lug · 42mm case
At a Glance
| # | Best For | Strap | Material | Thickness |
|---|---|---|---|---|
| 1 | Overall / First Purchase | Chestnut Buttero Chunky Strap | Buttero Calfskin | 3.0mm |
| 2 | Dressy / Formal | Mocha Crazy Horse Chunky Strap | Waxy Leather | 3.0mm |
| 3 | Everyday / Casual | Moss Green Babele Chunky Strap | Babele Calfskin | 3.0mm |
| 4 | Minimalist / Refined | Brown Buttero Chunky Strap | Buttero Calfskin | 3.0mm |
| 5 | Casual / Relaxed | Orange Buttero Chunky Strap | Buttero Calfskin | 3.0mm |
| 6 | Active / Sporty | Natural Buttero Chunky Strap | Buttero Calfskin | 3.0mm |
| 7 | Comfort / Wildcard | Maroon Crazy Horse Chunky Strap | Waxy Leather | 3.0mm |
Bell & Ross started life making watches for the French Air Force — that functional DNA has never left. The BR 05 Chrono Black Steel (ref. BR05C-BL-ST/SST) is a case in point. The finishing and attention to detail speak for themselves. A 24mm lug width and that unmistakable character make this watch a natural platform for strap changes.
The case measures 42mm with a thickness of 12mm — proportions that sit comfortably on most wrists without dominating them. For a sport watch, the case geometry handles everything from rubber to leather with equal confidence.
Here are my 7 picks — and why each one works.
Quick Specs
| Case diameter | 42mm |
| Lug width | 24mm |
| Lug-to-lug | |
| Case thickness | 12mm |
| Water resistance | 100m |
| Crystal | Sapphire with anti-reflective coating |
| Case material | Satin-polished stainless steel |
| Movement | BR-CAL.301 automatic chronograph (base Sellita SW 300) |
The 24mm lug width means your options are curated but well-covered. Already know what you're looking for? Browse all Bell & Ross BR 05 Chrono Black Steel-compatible straps on the Strap Finder →
1. Best Overall — Chestnut Buttero Chunky Strap
There's a reason this is the number one pick — it just works.
The Chestnut Buttero Chunky Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 3.0mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Bell & Ross BR 05 Chrono Black Steel is the contrast — the sporty character of the watch is complemented by the practical construction. With a 42mm case, the proportions stay balanced.
Once you see it on the wrist, it just clicks.
2. Best Dressy — Mocha Crazy Horse Chunky Strap
There's dressy, and then there's refined. This strap lands squarely in refined territory.
The Mocha Crazy Horse Chunky Strap uses crazy horse leather — an oil-infused leather that develops character with every scratch and mark. Rub a scratch with your thumb and it blends right back in. It is built for people who actually wear their watches, not baby them. At 3.0mm thick, it balances presence and wearability nicely.
The Bell & Ross BR 05 Chrono Black Steel's 42mm case is ideally proportioned for this strap. Whether you are wearing it casually or dressing it up, the combination feels intentional. It is the kind of pairing where both the watch and strap look better together than apart.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
3. Best Everyday — Moss Green Babele Chunky Strap
The strap you reach for without thinking — that's what an everyday pick should be.
The Moss Green Babele Chunky Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 3.0mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Bell & Ross BR 05 Chrono Black Steel is the contrast — the sporty character of the watch is complemented by the practical construction. With a 42mm case, the proportions stay balanced.
4. Best Minimalist — Brown Buttero Chunky Strap
Minimalism isn't about doing less. It's about doing exactly what's needed.
The Brown Buttero Chunky Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 3.0mm thick, it balances presence and wearability nicely.
Paired with the Bell & Ross BR 05 Chrono Black Steel's distinctive dial, this strap adds a layer of personality that the factory option does not offer. The 12mm case thickness means a padded strap like this one feels proportional and substantial.
The kind of strap that earns a permanent spot in your rotation.
5. Best Casual — Orange Buttero Chunky Strap
For those days when the Bell & Ross BR 05 Chrono Black Steel comes out with jeans and a t-shirt.
The Orange Buttero Chunky Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 3.0mm thick, it balances presence and wearability nicely.
On the Bell & Ross BR 05 Chrono Black Steel, this strap balances the tool-watch DNA with a touch of refinement. The 42mm case at 12mm thick pairs naturally with the padded construction without creating any imbalance on the wrist.
A combination that's greater than the sum of its parts.
6. Best Sporty — Natural Buttero Chunky Strap
A sportier option that brings comfort and durability without sacrificing style.
The Natural Buttero Chunky Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 3.0mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Bell & Ross BR 05 Chrono Black Steel is the contrast — the sporty character of the watch is complemented by the practical construction. With a 42mm case, the proportions stay balanced.
A combination that's greater than the sum of its parts.
7. The Wildcard — Maroon Crazy Horse Chunky Strap
Every rotation needs a curveball. This is mine.
The Maroon Crazy Horse Chunky Strap uses crazy horse leather — an oil-infused leather that develops character with every scratch and mark. Rub a scratch with your thumb and it blends right back in. It is built for people who actually wear their watches, not baby them. At 3.0mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Bell & Ross BR 05 Chrono Black Steel is the contrast — the sporty character of the watch is complemented by the practical construction. With a 42mm case, the proportions stay balanced.
Simple, effective, and genuinely enjoyable to wear.
A Note on Buckle Colour
Quick but important: always match your buckle to your case. The Bell & Ross BR 05 Chrono Black Steel's Satin-polished stainless steel case calls for a silver (brushed or polished) buckle. All Delugs leather straps ship with a pin buckle and can be upgraded to a Spring Deployant Clasp for extra security and convenience. All Delugs straps come with quick-release spring bars pre-installed, so swapping straps takes seconds.
How to Change the Strap on Your Bell & Ross BR 05 Chrono Black Steel
Swapping straps on the Bell & Ross BR 05 Chrono Black Steel is one of the easiest upgrades you can make — and with Delugs straps, you don't even need a tool.
If your Bell & Ross BR 05 Chrono Black Steel came on a bracelet, you'll first need to remove it. The easiest way to do this at home is with a Bracelet Removal Tool, which lets you compress the spring bars without risking scratches to the lugs or caseback. Once the bracelet is off, you can slide your new Delugs strap straight in.
All Delugs straps come with quick-release spring bars already pre-installed, so changing straps is completely tool-free. Here's how:
- Prepare your workspace. Lay the watch face-down on a soft cloth or microfiber pad to protect the caseback from scratches.
- Release the spring bar. Locate the small lever on the quick-release spring bar. Pull it back with your fingernail or fingertip to compress the bar.
- Remove the strap. While holding the lever, angle the strap out from between the lugs. Repeat for the other side.
- Insert the new strap. Slide one end of the spring bar into the lug hole. Pull the lever on the quick-release spring bar knob, guide the entire spring bar into the opposite lug hole, and then release the knob. You should hear a small click when the spring bar extends and seats into the lug hole.
- Check the fit. Give the strap a gentle tug to make sure both spring bars are securely locked in. If there's any play, reseat the spring bar.
The entire process takes under a minute once you get the hang of it — no spring bar tool required. The Bell & Ross BR 05 Chrono Black Steel uses a standard 24mm lug width, and all Delugs straps in 24mm will fit perfectly.
Frequently Asked Questions
What is the lug width of the Bell & Ross BR05C-BL-ST/SST?
The Bell & Ross BR05C-BL-ST/SST has a 24mm lug width. While 24mm is less common than 20mm, there is still a strong selection of quality straps available. All Delugs straps are available in 24mm.
What is the reference number for the Bell & Ross BR 05 Chrono Black Steel?
The reference number for the Bell & Ross BR 05 Chrono Black Steel is BR05C-BL-ST/SST. You can find this on the caseback of your watch or on the original paperwork. Knowing your reference number helps ensure you get the right lug width when ordering a strap.
Can I use a dressy leather strap on a Bell & Ross sport watch?
Yes — and it's a surprisingly good combination. Putting the BR 05 Chrono Black Steel on a leather strap, especially something like an alligator or saffiano, dresses it up for occasions where a bracelet or rubber might feel too casual. The contrast between a sport watch and a refined strap can be striking.
Do Delugs straps come with spring bars?
Yes — every Delugs strap comes with quick-release spring bars pre-installed. This means you can change straps by hand in seconds, without needing any tools. The quick-release mechanism uses a small lever that you pull with your fingertip to compress the spring bar.
What is the best strap material for the Bell & Ross BR 05 Chrono Black Steel?
For the BR 05 Chrono Black Steel, rubber and sailcloth are excellent starting points — waterproof, durable, and purpose-built for active wear. If you want to dress it up, waxy or nubuck leather straps add character while remaining practical. Browse the Strap Finder to see all compatible options.
Does Bell & Ross use quick-release spring bars?
Most Bell & Ross watches use standard spring bars that require a tool to remove. All Delugs straps come with quick-release spring bars pre-installed, so once you make the switch, future changes are completely tool-free.
Where can I find straps compatible with the Bell & Ross BR05C-BL-ST/SST?
The Bell & Ross Strap Finder shows every Delugs strap compatible with the BR05C-BL-ST/SST, filtered by lug width and style. You can also use the general Strap Finder to browse by brand, collection, and material. If you need help choosing, our team is available 24/7 via live chat.
Finding Your Strap
The beauty of the Bell & Ross BR 05 Chrono Black Steel is that it rewards experimentation. Leather one day, rubber the next — each strap brings out a different side of the watch.
Use the Bell & Ross BR 05 Chrono Black Steel Strap Finder to see every compatible strap in one place, filtered to your exact reference. Or if you'd rather explore by feel, the general Bell & Ross Strap Finder lets you browse the full lineup and find your match.
Not sure which strap is right for your specific BR 05 Chrono Black Steel? Our team is available 24/7 via live chat — drop us a message and we'll help you find the perfect match for your watch, wrist size, and style.
About Delugs
Founded in 2018 and headquartered in Singapore, Delugs is dedicated to elevating the experience of watch ownership through the simple yet powerful act of strap changing. We believe that straps are integral to how a timepiece is worn, perceived, and enjoyed. Our mission is to make strap changing a lifestyle — an everyday act of self-expression and versatility.
Delugs is an independent brand with a global community of clients, with a strong online presence and growing physical retail footprint. Our direct-to-consumer focus keeps us closely connected with the watch enthusiast community — fostering conversations, hosting events, and helping shape a more inclusive and expressive culture around watch collecting. We also work closely with watch brands to craft straps that complement their timepieces, bridging the gap between brand and collector, form and function.
Our catalogue spans leather, rubber, and fabric straps, with options for every watch and every occasion. We are committed to craftsmanship and quality, product design and innovation, and outstanding customer service. We offer watch owners the freedom to change straps as easily as changing outfits, and the opportunity to engage more deeply with the watches they love.
Visit our flagship boutique at Raffles Hotel, Singapore →
— Marcus
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