RAD - Race Application Dropper

When form meets function, it’s RAD!

We designed a radical, fully-integrated, featherweight dropper post to give our athletes a competitive edge on the most technical XC courses. Race Application Dropper is the first integrated dropper post designed for XC racing:

There‘s no match for our Impec Lab when it comes to rapid prototyping and developing concepts: a playground where functional integration and genius technical solutions are conceived, developed, and brought to life. RAD represents perfectly what the Impec Lab stands for; the pinnacle of BMC‘s technology and mechanical engineering expertise.

RAD, Simple and Effective

Up and Down!

XC racing is all about intensity and adrenaline, climbing at full speed or descending as fast as your bike will let you. RAD‘s intuitive two-position adjustment supports you in moments when a race is won or lost in a split second. With 80mm of drop on all sizes, RAD delivers the optimum saddle drop for every section of the racecourse.

Easy Saddle Height Adjustment

90mm of seat height range offers the perfect fit for every rider. Saddle height adjustments are performed just like on conventional systems and do not require cutting the seatpost.

Air Pressure and Easy Maintenance

RAD operates at low air pressures thanks to its oversized air chamber. This reduces force on the air seals, for less maintenance. RAD is completely mechanical and has no hydraulic parts, for easy services.

RAD -> 2 Bar / 29 PSI

Conventional Post -> 17 Bar / 250 PSI

Form meets Function, it‘s RAD!


RAD is 100g lighter than a conventional dropper post thanks to the integrated design.

30% Stronger

RAD’s oversized elliptic structure is more resistant to stress than a conventional round post.


The reduced number of parts improves the system’s performance and durability.

Race Application Dropper

RAD is manufactured through high-precision machining processes to achieve maximum accuracy required for flawless functionality of its sliding element.

RAD features varying wall thickness to achieve the perfect balance of dealing with rider induced forces and keeping the weight at a minimum.

Front: 2.3 mm wall thickness for increased strength and fatigue resistance

Side: 1.0 mm wall thickness for weight reduction

RAD‘s radical elliptic shape reduces weight while improving strength for reduced flex and uncompromised functionality under load impacts. Over 100g weight saving compared to a conventional design achieve a system weight of just 345g, making RAD one of the lightest dropper seatposts on the market.

Smart and Sleek

RAD moves the clamping system and the associated loads to the bottom of the seat tube. Allowing to design a lighter seat tube, since it does not require a traditional seatpost clamp, which eliminates negative effects of clamping on dropper post functionality. Thanks to RAD`s elliptic shape, the saddle is always straight.

Stronger and Lighter

Conventional dropper posts use round elements in order to be compatible with every frame on the market, leading to performance compromises and excessive weight. RAD was developed with the vision of creating the lightest and strongest XC dropper post without having external compatibility dictating the boundaries of shape, size, and material choice. Extended research on stress resistance and weight reduction with seatpost applications, highlighted the superior properties of an elliptic shape. This was the reason to develop the RAD seatpost and seat tube interface.

  Stress Score Weight
Round Shape 438 Mpa 143 g
Elliptic Shape 321 Mpa 113 g
  -30 % -30 g