Watch Strap Sizing Guide

Find Your Lug Width

The "Lug Width" is the internal distance between the two horns (lugs) of your watch case where the strap connects.

This must be exact (i.e. a 19mm strap will leave a gap on a 20mm watch, and a 22mm strap will not fit securely within a 20mm space).

How to Measure:

  1. Check the back: Many straps have the size stamped on the back lining (e.g., "19, 20, 22").
  2. Use a ruler/caliper: Measure the gap strictly from the inside of one lug to the inside of the other.
  3. Verify online: Search '[Your Watch + Model Number] lug width' to confirm manufacturer specifications.

Pro-Tip: Watch out for odd sizes. Vintage watches often use 19mm, while modern Rolex/Seiko are usually 20mm or 22mm.

Quick Reference Guide — The "Strap Monsters"

While thousands of watch models exist, a select few are famous for their versatility. These "Strap Monsters" are the most common watches customized by enthusiasts. If you own one of the icons below, we have verified your size:

Brand Model Series Lug Width
Rolex Submariner (pre-2020) 20mm
Rolex Submariner (2020 & newer) 21mm
Rolex Datejust 36 20mm
Omega Speedmaster Professional 20mm
Omega Seamaster Diver 300M 20mm
Tudor Black Bay 58 20mm
Seiko SKX007 / SRPD / 5 Sports 22mm

Determine Your Strap Length

Strap length is denoted by two numbers (e.g., 120mm + 80mm) — the "tail" side (long end) and the "buckle" side (short end).

While the total length exceeds your wrist size, this is necessary to accommodate the watch case and allow the tail to tuck neatly for a streamlined look.

How to Find Your Fit: Simply wrap a piece of string around your wrist bone to measure your circumference. If you measure between 6.5" and 7.5", our standard size is designed to provide the perfect fit.

A Note on "Taper"

  • "Taper" refers to how the strap narrows from the watch head down to the buckle. This subtle detail is what gives a watch strap its elegance and comfort on the wrist.

  • Standard Taper (e.g., 20mm → 18mm)

    The most common configuration. It provides a perfect balance of presence and comfort.

  • Vintage / Dress (e.g., 20mm → 16mm)

    A dramatic taper often seen on vintage Rolex and dress watches. It offers a refined, classic look.

  • Straight (e.g., 22mm → 22mm)

    Common on rugged dive watches where durability is the priority.
Premium Textured Rubber CTS Strap with Quick Release Butterfly Buckle Black

Adjusting Cut-to-Size (CTS) Straps

For our FKM rubber deployment and butterfly straps.
The fit is customized by you.

  1. Measure your wrist.
  2. Cut one "segment" of rubber off at a time (from the strap ends, not the center).
  3. Test the fit after every single cut.

Pro-tip: You can always cut more, but you cannot add it back!

Quick Release

All Grailloom straps are equipped with integrated Quick Release spring bars, allowing you to change your look in seconds without visiting a jeweler.

  1. Slide: Pull the small knob on the back of the strap to retract the pin.
  2. Snap: Align the strap with the lug hole and release the knob.
  3. Secure: Give the strap a gentle tug to ensure it is locked in place.