Casio G-SHOCK GA-B2100
(Photo/Josh Wussow)

Casio G-SHOCK GA-B2100 Watch Review: Best Analog G-Shock Gets Better

It’s not every day that you get to handle an icon. Still rarer are the times when, through some whim of the universe, you’re offered the chance to evaluate an upgraded version of a classic.

But when Casio came calling, that’s exactly what they were offering. The brand’s latest G-Shock, the GA-B2100 ($150), is a model with a storied lineage. So much so that it has its own nickname — the “CasiOak.” This comes from its silhouette, which bears a passing resemblance to the much more expensive, far less practical Audemars Piguet Royal Oak of hyper-luxury fame.

True, the new GA-B2100 may not have a tourbillon or minute repeater. But with the addition of Bluetooth connectivity and solar charging, it’s as if Casio squirted hot sauce all over an already delicious, octagonal pizza.

These particular condiments resulted in a $60 price hike from the previous gen and, after a few weeks of testing, I can confirm that they’re worth the extra charge. Read on to see why the B2100 CasiOak is one of the best adventure watches in the competitive outdoor space.

In Short: The G-Shock GA-B2100 is a good thing made (almost) perfect. By adding Bluetooth time-syncing and solar charging to one of their most popular designs, Casio has elevated the CasiOak into something of a modern classic.

Its intuitive layout, feature set, and rugged durability make it one of the most compelling timepieces under $200.

Casio G-SHOCK GA-B2100 Watch: Review

Casio G-SHOCK GA-B2100 - review
(Photo/Josh Wussow)

Casio G-SHOCK GA-B2100: Specs

  • Length: 48.5 mm
  • Height: 11.9 mm
  • Crystal: Mineral
  • Lume: Partial (Neobrite), double-LED Super Illuminator
  • Case/Bezel: Resin, carbon core
  • Water resistance: 200 m
  • Band: Resin

The Chassis and Functions

Casio G-SHOCK GA-B2100 & GWM5610-1
(Photo/Josh Wussow)

We’ll get to the features in a minute, but first, we need to talk about size. My biggest complaint with G-Shocks has always been this — most of them are too damn big. It’s why I’ve gravitated to their digital offerings, such as the classic GWM5610-1. But the GA-B2100 manages to avoid this issue, with a sensible diameter of 48.5 mm.

Best of all, the watch rises only 11.9 mm from the wrist. All this amounts to an incredibly wearable piece, buoyed by a weight of just 52 g.

Once it’s on your wrist, the CasiOak is an incredibly unfussy watch. While many G-Shocks suffer from legibility and operational learning curves, the B2100 is as intuitive as can be.

The face is open, the indices are well-defined, and the small LCD window is perfectly positioned. The upper left button switches day/date display, and the lower left cycles through its world timer, stopwatch, alarm, and countdown timer functions.

Casio G-SHOCK GA-B2100 Watch - ilumination
(Photo/Josh Wussow)

Casio’s Super Illuminator is triggered by the upper right, casting a bright light over the dial. The last, lower-right button is reserved for various settings and operational functions, all of which can be found in the included manual.

And see that little sub-dial near 9 o’clock? Beyond its use as a mode indicator, it’s also a gauge for the internal capacitor. After a few hours in the sun, the Tough Solar function should have the arrow pointing at H (high).

Casio G-SHOCK GA-B2100 - Tough Solar
(Photo/Josh Wussow)

As with most G-Shocks, the GA-B2100 features an exemplary 200 m of water resistance. But unlike its predecessor, this model can be synced with your phone through the Casio Watches app. This operates sort of like the WaveCeptor function found on the GWM5610-1.

Except, instead of listening for the atomic radio signal, this new CasiOak checks its internal time against the clock in your cellphone and adjusts itself accordingly.

A quick note about the band — personally, I like the resin. It’s lightweight, comfortable, and fits the watch’s go-anywhere ethos. However, if you really want to swap it out, conversion kits are available.

Real-World Use

Casio G-SHOCK GA-B2100 - Tough Solar
(Photo/Josh Wussow)

G-Shocks are meant for adventure, and the B2100 is no exception. This loaner accompanied me in the kitchen, on an overnight test run of my backpacking setup, and through several working days under rather challenging conditions. I wish the stories were as colorful as the photos, but honestly? The CasiOak just works.

How about a brief list of the things it withstood? Let’s see — sinks full of suds, large quantities of sunscreen, bug spray, sweat, sessions at the gym, photos in the sand, and probably a couple of dozen bike rides and showers between.

And the watch still looks just as fresh as it did when it first came out of the tin.

The Nitpicks

My complaints with the G-Shock GA-B2100 are few. First, there’s the mineral crystal. Yes, I’d like to see sapphire here instead, but with a price tag of $150, mineral is absolutely fine. It’s the same stuff used on my aforementioned GWM5610-1, and that one hasn’t scratched yet.

Then, there’s the lume. With the double LED, this watch doesn’t absolutely need luminous paint. Casio did go the extra half-mile, applying it to the hour and minute hands.

But it would’ve been nice to see them run the distance, with a full coat on the indices, as well. Still, the hands are distinct enough to see when you roll over in bed, and you can pretty much guess at the time without keying the light.

Casio G-SHOCK GA-B2100: Conclusion

Casio G-SHOCK GA-B2100 - watch review
(Photo/Josh Wussow)

Minor quibbles aside, this is an incredible watch. While it may be no Royal Oak, the GA-B2100 is a princely entry into the venerable G-Shock dynasty. And the addition of both Bluetooth and solar charging makes it the best version of the brand’s best analog design.

As I’ve hinted at elsewhere, we’re living in a golden age of affordable excellence in timepieces. And this watch once again shows why Casio is king. It’s going to be very, very difficult for me to send this one back to their PR team.

Maybe I’ll send them a check for $150 instead.

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Josh Wussow
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Josh Wussow is a writer and power sector worker based out of Wisconsin. He has degrees in English and video production, but you wouldn’t know it by his reviews and photos. Josh enjoys camping, hiking, and anything involving a campfire or grill. His work has taken him from Tennessee to New Mexico and Colorado. He misses the mountains very much.