Watch Almanac
Casio

G-Shock GBA-900

Ref. GBA-900-1A

Case diameter
48.9 mm
Manufacturer spec
Lug-to-lug
51.3 mm
Manufacturer spec
Thickness
16.6 mm
Manufacturer spec
Lug width
—
Not published

Retail price $140 (US, Oct 2026)

Snug, lugs near the edge
Wrist flat: 55.1 mmLug-to-lug: 51.3 mm

How the G-Shock GBA-900 wears

Its lugs add only 2.4 mm to the 48.9 mm case, against 7 mm typical across the almanac, so it wears smaller than its diameter suggests.

On our fit model it sits best on wrists from 7.25" to 8.5" (18.4–21.6 cm); below 7.25" the lugs start to reach the edge of the wrist.

At 16.6 mm thick it is thicker than 85% of the 26 other digital watches we've measured, so expect it to sit tall on the wrist.

Will the G-Shock GBA-900 fit your wrist?

With a 51.3 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

WristFlat width (est.)Fit
6"47.2 mmLugs overhang
6.5"51.2 mmLugs overhang
7"55.1 mmSnug, lugs near the edge
7.5"59.1 mmIdeal fit
8"63 mmIdeal fit

Specifications

Reference
GBA-900-1A
Collection
G-Shock
Status
In production
Introduced
2021
Case material
resin
Crystal
mineral
Water resistance
200 m
Bezel
fixed resin
Dial
black
Strap / bracelet
resin strap
Weight
61 g
Style
Digital, Sport

Movement

Caliber
Casio 5641
Type
quartz

More G-Shock references

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Sources