Principia Rex Pro
- Material
- Aluminium
- Brakes
- Rim Brakes
- Size
- 56cm
- Groupset
- Campagnolo Record 10-speed
The Frame
Aluminium frame with Mizuno Carbon fork. Lightweight racing geometry optimized for endurance and speed. Professional-grade components throughout. Frame weight just 1,140g.
Principia
Principia was a Danish manufacturer renowned for razor-sharp aluminium race frames through the 1990s and 2000s. Their Rex Pro, at barely 1,140 g, demonstrated that large-diameter, robotically welded aluminium could compete with carbon on weight while retaining its direct, unfiltered road feel.
About Principia
Principia is a Danish bicycle manufacturer based in Randers, Denmark, known for producing high-performance aluminium and carbon road, gravel, and mountain bike frames with an obsessive focus on stiffness-to-weight ratio.
Build Specification
- Groupset
- Campagnolo Record 10-speed with compact 50/34 crankset, upgradeable to Titanium carbon rear derailleur.
- Handlebar
- Deda Zero
- Stem
- Deda Zero
- Wheelset
- Mavic RSYS Exalith (622x19C ETRTO)
- Tires
- Continental Grand Prix 4-Season 700x25c
- Seatpost
- Carbon seatpost
- Saddle
- Brooks B15 Swallow Unique Black saddle
Details
Schindelhauer pedals
Market Notes
Principia is a Danish brand known for high-quality aluminium frames. The Rex Pro is their top-end aluminium race frame. New Principia REX retails at ~GBP 3'299, which is premium for aluminium. Used market presence is limited as the brand is niche, primarily known in Scandinavian and UK cycling circles.
Gallery
