Horlobase
enfrde

Rado · True Round

Rado True Round Automatic Open Heart

Reference R27107172 · Classic · 40 mm

Ø 40 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
R27107172
Family
True Round
Category
Classic
Status
Current
Case material
Ceramic
Case diameter
40 mm
Case thickness
10.4 mm Official
Lug-to-lug
—
Lug width
—
Water resistance
—
Bezel
—
Calibre
R734 Official
Power reserve
up to 80 h

Official product page · retrieved October 18, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

No lug-to-lug dataFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmNo lug-to-lug dataCase diameter 40 mm
Side view, across the wrist

No lug-to-lug figure exists for this reference yet, so fit cannot be computed.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
10.4 mm Official Rado October 18, 2026

Lug-to-lug

No source gave this figure yet.

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

No source gave this figure yet.

Calibre source

Official Rado · retrieved October 18, 2026

Other versions in the same case

These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.

Other True Round references

Watch Ø Thickness Lug-to-lug Calibre
True Round (40 mm) R27238162 40 mm 8.9 mm — R073
True Round Automatic R27056152 40 mm 10.4 mm — R763
True Round Open Heart Limited Edition R27183012 40 mm 10.4 mm — R734
True Round Thinline Anima Limited Edition R27112312 40 mm 9 mm — R766
True Round Thinline R27006912 39 mm 5 mm — R420
True Round Thinline Les Couleurs™ Le Corbusier R27091612 39 mm 5 mm — R420
True Round (30 mm) R27059162 30 mm 8 mm — R079

Other Rado models

Watch Ø Thickness Lug-to-lug Calibre
True Round Secret R27108312 40 mm 10.4 mm — R734
True Round x Les Couleurs® Le Corbusier R27048162 40 mm 10.4 mm — R763
Centrix (39.5 mm) R30021152 39.5 mm 9.8 mm — R073
Centrix Automatic (39.5 mm) R30017012 39.5 mm 11.3 mm — R763
Centrix Automatic Open Heart R30008302 39.5 mm 11.3 mm — R734
Coupole Automatic (41 mm) R22876013 41 mm 10.3 mm — R763
Show 54 more
Watch Ø Thickness Lug-to-lug Calibre
Coupole Automatic Power Reserve R22878045 41 mm 11.7 mm — R772
Coupole Open Heart Automatic R22895215 41 mm 10.3 mm — R734
Florence Automatic R48903103 39 mm 11 mm — R763
HyperChrome Automatic Open Heart R32021102 42 mm 10.2 mm — R734
True Square Automatic (9.6 mm thick) R27078172 38 mm 9.6 mm — R763
True Square Automatic (9.7 mm thick) R27077102 38 mm 9.7 mm — R763
True Square Automatic Open Heart R27073012 38 mm 9.7 mm — R734
True Square Automatic Skeleton R27177255 38 mm 9.7 mm — R808
True Square Undigital R27075152 38 mm 9.6 mm — R763
True Square x Ash Barty Limited Edition R27123905 38 mm 9.7 mm — R734
True Square X Kunihiko Morinaga Special Edition R27086172 38 mm 9.7 mm — R734
HyperChrome (steel) R32280109 41.5 mm 11.7 mm — R292
HyperChrome (titanium) R32281309 41.5 mm 11.7 mm — R292
DiaStar Original (38 mm) R12161313 38 mm 12.1 mm — R764
DiaStar Original 60-Year Anniversary Edition R12163118 38 mm 12.3 mm — R764
DiaStar Original Automatic (38 mm) R12160103 38 mm 12.1 mm — R764
DiaStar Original Automatic Skeleton R12162153 38 mm 11.9 mm — R808
DiaStar Original Skeleton R12159309 38 mm 11.9 mm — R808
DiaStar Original Skeleton Limited Edition R12166309 38 mm 11.9 mm — R808
DiaStar Original X Tej Chauhan Special Edition R12165155 38 mm 11.7 mm — R764
Florence (38 mm) R48912023 38 mm 8.7 mm — R073
True Square Thinline R27047902 37 mm 5 mm — R420
Coupole Automatic (37.7 mm) R22861115 37.7 mm 10.2 mm — R763
Anatom R10260152 27.5 mm 10.2 mm — R592
Anatom Automatic R10200152 32.5 mm 11.3 mm — R766
Anatom Automatic Skeleton R10206109 32.5 mm 11.5 mm — R808
True Square R27072012 29.2 mm 8.1 mm — R079
Centrix (30.5 mm) R30024012 30.5 mm 8.9 mm — R079
Centrix Automatic (30.5 mm) R30019012 30.5 mm 10.3 mm — R582
Coupole R22885945 34 mm 9.7 mm — R084
Coupole Automatic (31.8 mm) R22865115 31.8 mm 9.7 mm — R561
DiaStar Original (30 mm) R12171313 30 mm 11 mm — R586
DiaStar Original Automatic (30 mm) R12170113 30 mm 11 mm — R586
Florence (30 mm) R48913023 30 mm 7.8 mm — R079
Captain Cook Discover R32278162 40.7 mm 12.3 mm — R763
Captain Cook R32223229 39 mm 12 mm — R763
Captain Cook Automatic (39 mm) R32223203 39 mm 12 mm — R763
Captain Cook Over-Pole Limited Edition R32193018 39 mm 10.9 mm — R862
Captain Cook X Tennis Limited Edition R32222108 39 mm 12 mm — R763
Centrix Chronograph R30210152 41 mm 11.4 mm — R312
Captain Cook Automatic (42 mm, 12.1 mm thick) R32505019 42 mm 12.1 mm — R763
Captain Cook Automatic (42 mm, 12.3 mm thick) R32105203 42 mm 12.3 mm — R763
Captain Cook Automatic Bronze R32504315 42 mm 12.5 mm — R763
Captain Cook Limited Edition R32504208 42 mm 12.5 mm — R763
Captain Cook X European Cricket Special Edition R32138208 42 mm 12.3 mm — R763
Captain Cook Automatic Chronograph (high-tech ceramic) R32146208 43 mm 14.8 mm — R801
Captain Cook High-Tech Ceramic R32127152 43 mm 14.6 mm — R734
Captain Cook High-Tech Ceramic Automatic Chronograph R32189313 43 mm 16.2 mm — R801
Captain Cook High-Tech Ceramic Chronograph R32195202 43 mm 16.2 mm — R801
Captain Cook High-Tech Ceramic Diver R32129152 43 mm 14.6 mm — R763
Captain Cook High-Tech Ceramic Skeleton R32129168 43 mm 14.6 mm — R808
Captain Cook Hrithik Roshan Special Edition R32128162 43 mm 14.6 mm — R734
Captain Cook Automatic Chronograph (steel) R32145158 43 mm 14.8 mm — R801
HyperChrome Chronograph R32259153 44.9 mm 11.7 mm — R312

← All watches