Bell & Ross built its reputation on the square, cockpit-inspired case of the BR01 and BR03 — an aviation instrument for the wrist. That bold, unmistakable shape is exactly why the strap matters so much: swap it and the watch shifts from tactical tool to refined everyday piece. This guide covers your rubber and leather options for the BR01, BR03 and BR05, the 34x24mm sizing to get right, and how to fit and care for each.
The square case that defines the strap
The BR01 and BR03 take their design straight from aircraft cockpit instruments: a large square case, four screws at the corners, and a highly legible dial. Because the case is so distinctive, the strap does a lot of the styling work. A rubber strap leans into the watch’s tool-and-dive character; leather pulls it toward a smarter, dressed-up look. The newer BR05 moves to an integrated sports design, but for the classic square BR01/BR03 the strap is a simple, high-impact way to change the watch’s personality in minutes. Browse everything in the Bell & Ross collection.
Rubber: the tool-watch and summer choice
Rubber suits the BR01/BR03’s utilitarian roots and is the natural pick for water, heat and sport. A quality rubber strap is waterproof, resists sweat, salt and UV, and wipes clean in seconds — and it lets the bold square case take centre stage. Our rubber strap for the BR01 and BR03 is a 34x24mm taper with a pin buckle, available in black, blue, gray and orange so you can match or contrast the dial. For a slightly different profile, the replacement rubber band offers another take on the same fit.
Leather: dressing the square case up
Leather softens the industrial edge of the BR01/BR03 and takes the watch comfortably into the office or evening. The contrast between a technical square case and a warm leather band is a big part of the appeal, and brown tones in particular give the watch a vintage, pilot-instrument feel. Our genuine leather strap for the BR01 and BR03 is a 34x24mm fit with a pin buckle in silver or black, in five colours from black and blue through to light, mid and dark brown. Keep leather away from prolonged water and it will patina nicely over time.
Sizing: the 34x24mm fit
The classic BR01 and BR03 use a 34x24mm strap — 24mm where the strap meets the case, in the wide profile the square lugs require. This is not a standard 20mm or 22mm fit, so it is essential to choose a strap cut specifically for Bell & Ross rather than a generic band, which will not sit correctly against the square case. The integrated BR05 uses its own fitting, so confirm your exact model before ordering. If you are unsure, our lug width guide can help you check.
How to fit a Bell & Ross strap
Changing the strap on a BR01/BR03 takes a spring-bar tool and a couple of minutes. Rest the watch face-down on a soft cloth to protect the case, slide the tool between the strap and the lug, compress the spring bar until one side releases, and lift the strap away. Fit the new band by seating one end of the spring bar in its hole, compressing the other end and guiding it into place until it clicks. Always tug both sides to confirm the bars are locked before wearing the watch. Because the strap is wide, take a moment to check it sits square and centred against the case.
Caring for your strap
Rubber is effectively maintenance-free — rinse it with warm water after salt, chlorine or heavy sweat and it will look new for years. Leather needs a gentler routine: keep it dry, wipe it with a slightly damp cloth when needed, and let it breathe between wears. Keeping a rubber strap for active days and a leather one for the office gives you two very different watches from one BR01 or BR03, and extends the life of both.
Which should you choose?
Go rubber for a sporty, tool-watch look and for water, heat and everyday durability; go leather to dress the square case up and add warmth and contrast. Since a swap takes only minutes, many BR01/BR03 owners keep one of each. Browse both in the Bell & Ross collection.
Frequently asked questions
What size strap does a Bell & Ross BR03 take?
The classic BR01 and BR03 use a 34x24mm strap — 24mm where it meets the case, in the wide profile the square lugs need. Choose a strap cut for Bell & Ross rather than a generic band, and confirm your model, as the BR05 uses a different fitting.
Can I put a normal strap on a Bell & Ross?
The BR01/BR03 uses a wide 34x24mm fit rather than a standard 20mm or 22mm width, so a generic strap will not sit correctly against the square case. Use a strap made for the Bell & Ross fit for a clean, secure result.
Is rubber or leather better for a BR01/BR03?
Rubber suits the tool-watch character and is best for water, heat and sport; leather dresses the square case up for the office or evening. Because swaps are quick, many owners keep both and change to suit the day.
Does an aftermarket strap fit the Bell & Ross BR05?
The BR05 is an integrated sports design with its own fitting, different from the classic BR01/BR03 lugs. Always confirm your exact reference before ordering, as a BR01/BR03 strap will not fit the BR05.