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Casio GA-B2100 (G-Shock) Specifications
| Reference | GA-B2100-1A1, GA-B2100-1A |
|---|---|
| Case Size | 45.4mm |
| Lug Width | 24mm |
| Lug-to-Lug | 48.5mm |
| Thickness | 11.9mm |
| Case Material | carbon core guard resin |
| Crystal | mineral glass |
| Water Resistance | 200m |
| Movement | 5685 (quartz (analog-digital, solar, Bluetooth)) |
| Bezel | fixed resin bezel/octagonal |
| Crown | push buttons |
| Case Back | screw-down |
| Price Range | $130-$160 |
Compatible Straps for the Casio GA-B2100 (G-Shock)
The GA-B2100 (G-Shock) uses a 24mm Lug Width and is compatible with the following strap types.
| Type | Recommended Brand | Why It Works | Price Range | Link |
|---|---|---|---|---|
| OEM resin band | Casio OEM | Compatible with 24mm attachment | $15–$80 | |
| aftermarket resin band | JaysAndKays | Compatible with 24mm attachment | $15–$80 | |
| metal conversion kit bracelet | Aliexpress metal kits | Compatible with 24mm attachment | $15–$80 | |
| NATO/ZULU (with adapter) | Casio OEM | Classic look, easy to swap, fits 24mm lugs | $15–$80 |
Replacement Parts for the Casio GA-B2100 (G-Shock)
| Part | Description | Compatibility Note |
|---|---|---|
| resin band | Replacement wrist band | 24mm attachment |
| resin bezel/shell | Outer ring marking | Matches fixed resin bezel/octagonal configuration |
| spring bars | Pins that hold the strap to the case | 24mm, 1.5mm diameter recommended |
| back cover gasket | Seal that maintains water resistance | Required for 200m WR rating |
| buttons | Replacement component | Check compatibility with GA-B2100 (G-Shock) |
Modding the Casio GA-B2100 (G-Shock)
The GA-B2100 (G-Shock) is a popular platform for modding. Here are the most common modifications.
- metal case/bracelet conversion kit — Upgrade to a premium aftermarket strap or metal bracelet.
- bezel swap — Swap the stock bezel insert for a ceramic, lumed, or differently colored option.
Frequently Asked Questions
What is the difference between the GA2100 and GA-B2100?
The GA-B2100 adds Tough Solar charging and Bluetooth smartphone connectivity to the CasiOak design. The case dimensions are nearly identical.
Do GA2100 metal mod kits fit the GA-B2100?
Most GA2100 metal conversion kits are compatible with the GA-B2100 due to nearly identical case dimensions. Always check the specific kit listing for B2100 compatibility.
Does the GA-B2100 need battery replacements?
No. The GA-B2100 uses Tough Solar technology that charges from light. The rechargeable battery can run for approximately 7 months without light exposure.