Casio
Casio G-Shock GM-2100 Strap Size & Fitting
The Casio G-Shock GM-2100 uses an integrated / proprietary fitting, not standard lugs — so it needs G-Shock GM-2100-specific straps or an adapter kit.
Lug fittingIntegrated
| Lug fitting | Integrated / proprietary |
|---|---|
| Case diameter | 44.4 mm |
| Lug-to-lug | 48.5 mm |
| Thickness | 12.8 mm |
Strap styles that fit
- Brand / OEM strapMade for this exact model.
- Adapter + standard strapBuy a model-specific adapter first.
- NATO / pass-throughNo standard lugs to pass through.
- 2-piece leatherNeeds an adapter to fit.
- Rubber / FKMOEM or adapter only.
- Metal braceletModel-specific bracelet only.
▲ Metal-bezel CasiOak; GA/GM-2100 adapters needed.
Get the right strap
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Casio G-Shock GM-2100 — strap questions
What strap size does the G-Shock GM-2100 take?
The Casio G-Shock GM-2100 doesn't use standard spring-bar lugs — it has an integrated/proprietary fitting, so you need G-Shock GM-2100-specific straps or an adapter kit rather than a normal strap.
Can I put a normal NATO or leather strap on it?
Not directly. A standard strap won't attach without a model-specific adapter — fit the adapter first, then a normal strap can be used.
Where can I buy straps that fit the G-Shock GM-2100?
Search for straps and adapters made specifically for the Casio G-Shock GM-2100; generic sizes won't clip in without one.