Richard Mille RM 55-01: Ultra-Light Titanium Sports Watch with Minimalist Hand-Wound Movement and TPT Case

In a world where Richard Mille has built its reputation on extremely complex sports watches, the new RM 55-01 represents an unexpected shift toward a more restrained approach. Instead of emphasizing complications and spectacular mechanisms, this model focuses on minimal weight and a reduced construction. The hand-wound movement weighs less than five grams, roughly equivalent to the weight of a sheet of A4 paper, and the watch displays only hours, minutes, and seconds.

Since the early 2000s, the brand has essentially defined the segment of luxury “hyper” sports watches, combining unconventional materials, technical complications, and aggressive design into a highly recognizable identity. The RM 55-01 now returns to basics with a movement developed solely to achieve extreme lightness. Automatic winding and additional functions have been omitted, which is quite unusual for a modern Richard Mille watch.

The new model strongly recalls the earlier RM 055 “Bubba Watson.” The case shape and movement architecture are very similar to that earlier watch, although the RM 055 was primarily promoted as a lightweight and durable golf watch. In the RM 55-01, the emphasis is almost entirely on mass reduction. Although the price has not been announced, it is clear that the watch’s value cannot easily be justified through conventional measures of practicality or material cost. Still, a mechanical watch weighing only a few grams remains unusual enough to attract collectors’ attention.

The case construction is designed to create a sense of maximum openness. The large case appears like a display window in which the movement seems to float in space.

The colored bezel and caseback create a strong visual identity, and each version has its own character. The model is available in three executions: White Quartz TPT, Grey Quartz TPT, and Carbon TPT. Although the “Grey” name suggests a grey tone, this version actually has a pastel blue color.

The material used for the bezel and caseback is produced by the Swiss company North Thin Ply, and the TPT designation stands for “Thin Ply Technology.” Unlike conventional composites commonly used in watchmaking, this material features a distinctive layered texture that further emphasizes the technical character of the watch. The titanium central case, with its clean lines, balances the more visually complex composite components.

Inside the watch is the RMUL4 movement, where the “UL” designation stands for “Ultra Light.” Structurally, it is very close to the RMUL2 movement found in the RM 055 “Bubba Watson,” with minor differences in finishing and a few aesthetic changes to visible components.The visual style of the movement follows the industrial and technical approach typical of Richard Mille. Grade 5 titanium bridges are treated with a Titalyt process and further enhanced with a PVD coating.

Special spline screws are developed in-house and engineered to withstand varying levels of torque without significant wear during servicing.

The movement architecture is reduced to essential components: mainspring barrels, gear train, and oscillator. The construction features a free-sprung balance operating at 4 Hz and two series-coupled barrels. The power reserve is 55 hours, suggesting rapid barrel rotation to maintain stable energy transmission throughout the watch’s operation. A similar approach has been used by Longines in the L.990 series and various modern Omega Co-Axial movements.

The case measures 37.95 mm x 47.33 mm, with a thickness of 10.75 mm. It is available in Quartz TPT or Carbon TPT versions, with sapphire crystal and water resistance up to 50 meters. The RMUL4 operates at a frequency of 28,800 vibrations per hour, is manually wound, and comes on a textile strap with a folding clasp. The model is not a limited edition and will be available exclusively through Richard Mille boutiques, with pricing available upon request.

Pictures: Richard Mille