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[G-SHOCK Comparison] GA-B2100 VS GM-B2100 VS GA-2100

The Ultimate Guide to All G-SHOCKs — composed by Experts

Can’t choose between G-SHOCK GA-B2100, GM-B2100 and GA-2100? Enjoy our comparison table and the best features unique list of each series.

We are trying to compare the watches from one collection or “similar” price categories. Besides, you may find our rating system and pros & cons section below. Enjoy!


GA-B2100

GM-B2100

Price (Amazon)

Year of first Release

2022

2022

2019

Accuracy

Bluetooth (via phone app)

Bluetooth (via phone app)

±15 seconds per month

SmartWatch Features

Yes

Yes

No

Light

Double LED light (Super Illuminator)

Double LED light (Super Illuminator)

Neobrite (hands and hour markers) Double LED light

Alarm

5 daily alarms

5 daily alarms

5 daily alarms

Timer

Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)

Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)

Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)

Stopwatch

1/100-second stopwatch
Measuring capacity:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00~23:59'59 (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, lap/split time

1/100-second stopwatch
Measuring capacity:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00~23:59'59 (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, lap/split time

1/100-second stopwatch
Measuring capacity:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00''~23:59'59'' (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, split time, 1st-2nd place times

Hourly Time Signal

Yes

Yes

Yes

World Time

38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping

38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping

31 time zones (48 cities + coordinated universal time), daylight saving on/off

Screw Back

No

Yes

No

Carbon Core Guard

Yes

No

Yes

Case / bezel material

Carbon / Resin

Stainless steel

Carbon / Resin

Glass

Mineral Glass

Mineral Glass

Mineral Glass

Battery

Solar powered (CTL920)

Solar powered (CTL920)

3 years on SR726W

Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size

48.5×45.4×11.9

49.8×44.4×12.8

48.5×45.4×11.8

Full features (if you want to know more)

*Want to compare some other features? Please, comment and we will improve our table.


G-SHOCK GA-B2100 Rating System

Rating: 5 out of 5.
Size★★★★★
Weight★★★★★
Functions★★★★★
Materials★★★★★
Price★★★★★

G-SHOCK GA-B2100 PROs & CONs

*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!

– Solar Powered (Tough Solar). No need to worry about the battery change
– Octagonal Form (trendy & stylish design). Luxury brands are also boasting an OAK design
– Bluetooth (easy to operate via smartphone)
– Bluetoot Accuracy Calibration (checks if the watch shows the ideal time)
– Carbon Core Guard (the watch is more lightweight but stronger in comparison with a traditional case)
– Affordable price
– Good hands readability
– Additional digital display enhances functionality
– Double LED Light (one for the face and one for the digital display)

– Only traditional functions (World time, Stopwatch, Timer, Alarms etc.)
– Without sports functions (like GPS, Steptrecker, advanced timers)
– No Radio Calibration (you have only Bluetooth Time Sync)
– Difficult digital display readability (if the model uses a negative display)
– Budget-friendly materials but durable
– No Second Hand


G-SHOCK GM-B2100 Rating System

Rating: 3.5 out of 5.
Size★★★★
Weight
Functions★★★★★
Materials★★★★
Price★★

G-SHOCK GM-B2100 PROs & CONs

*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!

– Full-metal Oak (very popular bezel design)
– Luxe Look (like other premium brands of much higher price)
– Minimalistic Design
– Slim module (good for classic wear)
– Solar Powered (Tough Solar)
– Screw-back case (like in old-school traditional watches but that also good for durability)
– Bluetooth (easy to operate via smartphone )
– Bluetooth Accuracy Calibration (checks if the watch shows the ideal time)
– Double LED Light (one for the face and one for the digital display)

– Doubtful readability (the hands are not very distinct in some series)
– Heavy (165 g while DW-5600 is 51 g)
– Mineral Glass (could be Sapphire)
– Not for everyday use (*too objective but still)
– Only traditional functions (World time, Stopwatch, Timer, Alarms etc.)
– High price (because of steel)
– No Radio Calibration (you have only – Bluetooth Time Sync)
– Difficult digital display readability (if the model uses negative type)
– No Second Hand


G-SHOCK GA-2100 Rating System

Rating: 4.5 out of 5.
Size★★★★★
Weight★★★★★
Functions★★★
Materials★★★★★
Battery Years★★★
Price★★★★★
How did we compose this rating? Enjoy our calculations →

Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.

PROs
+ lightweight
+ attractive watch face
+ quick set up
+ easy to read
+ significantly thinner than the previous models
+ unique design
+ relatively cheap

CONs
– no solar
– this model as metal version with solar and Bluetooth will be a dream…
– An useless LED

Feedback from Experts *based on comparison info with similar watches by price, model range, etc.

PROs
+ hourly Time Signal
+ carbon (Carbon Core Guard) / Resin material
+ 3 years battery

CONs
– no Auto-Back Light
– no Magnetic Resistance


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