Cosmograph Daytona

Ref. 126500LN

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: 47.8 mm; Measured in a published review
Thickness: 11.9 mm; Measured in a published review
Lug width: 20 mm; Measured in a published review

Retail price $16,900 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 47.8 mm

How the Cosmograph Daytona wears

Its lugs add 7.8 mm to the 40 mm case, close to the 7.1 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 11.9 mm thick it is slimmer than 96% of the 24 other chronograph watches we've measured, so it slides under a cuff more easily than most.

Its 20 mm lug width is one of the most common strap sizes; 104 other watches here share it, so aftermarket straps are easy to find.

Will the Cosmograph Daytona fit your wrist?

With a 47.8 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.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Lugs overhang
6.5"	51.2 mm	Snug, lugs near the edge
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: 126500LN
Collection: Cosmograph Daytona
Status: In production
Introduced: 2023
Case material: Oystersteel
Crystal: sapphire
Water resistance: 100 m
Bezel: fixed black monobloc Cerachrom bezel with tachymetric scale
Dial: white with black counter rings
Strap / bracelet: Oyster bracelet, three-piece solid links, Oysterlock clasp with Easylink
Style: Chronograph, Sport

Movement

Caliber: Rolex 4131
Type: automatic
Power reserve: 72 hours
Frequency: 28,800 vph (4 Hz)
Jewels: 47
Accuracy: -2/+2 s/day (Superlative Chronometer)

Compare

Cosmograph Daytona vs Omega Speedmaster Moonwatch Professional

Takes 20 mm straps. See other 20 mm watches and straps.

Watches that wear the same size

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

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Cosmograph Daytona.