How to Size a Watch Strap

Step 1: Measure Your Wrist

The most accurate way to measure your wrist is with a flexible measuring tape. Wrap it snugly (but not tight) around your wrist just below the wrist bone, where you would normally wear a watch. Note the measurement in inches or centimeters.

If you do not have a measuring tape, use a strip of paper or string: wrap it around your wrist, mark where it overlaps, and measure the length against a ruler.

• Small wrist: Under 6.5 inches (16.5 cm)
• Medium wrist: 6.5 to 7.5 inches (16.5 to 19 cm)
• Large wrist: Over 7.5 inches (19 cm)

Step 2: Determine Strap Width

Strap width refers to the measurement where the strap attaches to the watch case (the lug width). This is determined by the watch, not your wrist. Common widths are 18mm, 20mm, 22mm, and 24mm.

To find your watch's lug width, check the product specifications or measure the gap between the lugs with a ruler. Using the wrong width strap will result in a poor fit against the case, with either visible gaps or a strap that does not fit at all.

TSAR BOMBA's interchangeable models use specific lug widths designed for their quick-release system. If you are purchasing additional straps for an interchangeable model, ensure they match the specified width. See our interchangeable series review for more details.

Step 3: Choose Strap Length

Most straps come in a standard length range that accommodates the majority of wrist sizes through the buckle or clasp adjustment. However, if you have a particularly small or large wrist, you may need a short or long strap length:

Step 4: Select Strap Material

The strap material affects comfort, durability, and appearance:

• Silicone / rubber: Lightweight, waterproof, comfortable for sport and everyday wear. Easy to clean. Best for active use.
• Leather: Classic appearance, develops character with age. Not water-resistant; avoid for swimming or heavy sweating. Best for business and casual elegance.
• Stainless steel bracelet: Premium look, very durable. Heavier than other options. Usually requires link removal for sizing. Best for an all-metal, polished look.
• NATO / nylon: Casual, lightweight, breathable. Available in many colors and patterns. Best for casual wear and personalization.

How Tight Should Your Watch Be?

Your watch should sit snugly enough that it does not slide up and down your wrist, but loose enough that you can fit a finger between the strap and your skin. The watch should stay in place during normal activities without leaving marks or causing discomfort.

A common mistake is wearing the watch too tight, which causes sweating and skin irritation, or too loose, which allows the watch to rotate and bang against surfaces.

Quick-Release Strap Tips

If you are using a watch with a quick-release system (like TSAR BOMBA's interchangeable series), here are a few tips for smooth strap changes:

• Always operate the release lever with your fingernail or a soft tool, never a metal instrument that could scratch the case.
• When inserting a new strap, ensure the spring bar fully clicks into both lugs. Give the strap a gentle tug to confirm it is secure.
• Keep spare straps stored flat to prevent deformation, especially leather straps.