GA-2100 CasiOak — Cases, Straps & Adapters

The GA-2100 is the most modded G-Shock ever — an octagonal case begging for a Royal Oak treatment. We carry everything the CasiOak build needs: metal cases in 316L steel, titanium and carbon fiber, 22mm bracelets and FKM straps, and the adapters that make any standard band drop onto the resin lugs. Every part is blank-bezel and logo-free, installs in under five minutes, and ships with a fit guarantee for the models listed below.

Fitment chart

Model Lug / Mount Adapter
GA-2100 / GA-2110 22mm (with adapter) Adapter required for standard 22mm straps
GM-2100 Proprietary (see GM-2100 collection) No adapter for dedicated straps
GA-B2100 Proprietary (see GA-B2100 collection) No adapter for dedicated straps

Quick answers

Do I need an adapter to put a normal strap on my GA-2100?

Yes — the stock resin lugs are not standard spring bars. Our GA-2100 adapters convert them to standard 22mm, so any two-piece strap or bracelet fits.

Will the metal case keep water resistance?

Our case kits include a new gasket. With the gasket seated correctly, the build holds everyday splash resistance; for diving we recommend keeping the stock resin configuration.

How long does the swap take?

Under five minutes with a spring bar tool — no movement removal required, the module stays in the stock case when changing straps.

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