If you're converting your Royal Pop from a pocket watch to a wristwatch, one of the first questions you'll ask is: what size strap do I need? Here's the definitive answer.
The Short Answer
22mm. The RP Wrist Adapter uses a standard 22mm lug width. Any 22mm watch strap will work.
Why 22mm?
We chose 22mm for the adapter's lug width because it's the sweet spot for a 40mm case:
- It's one of the most common strap sizes — the aftermarket selection is enormous
- It provides good visual balance with the 40mm octagonal case
- It's the same width used on many popular 40-42mm watches from Omega, Tudor, and others
- The original Royal Oak uses 21mm — close enough that the proportions feel right
Will Any 22mm Strap Work?
Almost any. There are a few things to check:
Spring Bars
All RP Wrist Adapters use standard drilled lugs that accept regular spring bars. Quick-release spring bars (recommended) and traditional spring bars both work. RP Straps strap kits include quick-release bars for tool-free swapping.
Strap Thickness
Straps up to 4mm thick fit comfortably in the adapter's lugs. Most quality straps are 2.5-4mm, so this covers the vast majority of options.
End Links
If you're using a metal bracelet from another brand, the end links may not match the adapter's lug geometry. Our stainless steel bracelet kit is designed with matched end links. Third-party metal bracelets with flat or universal end links should work, but curved/fitted end links from other watch models won't.
Measuring Your Wrist
Beyond the strap width, you need to make sure the strap length fits your wrist:
- Small wrists (5.5"-6.5" / 14-16.5cm): Standard length straps work. Our silicone strap has the widest range (5.5"-8.5").
- Medium wrists (6.5"-7.5" / 16.5-19cm): All strap types fit perfectly at standard length.
- Large wrists (7.5"-8.5" / 19-21.5cm): Silicone and steel bracelet have the most range. Leather straps may be tight at the last hole — contact us for long options.
Our Recommendation
If this is your first strap: start with silicone. It fits the widest range of wrist sizes, it's waterproof, and it's the most affordable option. You can always upgrade to leather or FKM later — the adapter works with any 22mm strap, so you're never locked in.