I Had Problems With The Worlds Lightest Bike... X-LAB RT9 First Look
CADE Media
May 06, 2026
close, but no cigar.
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Keywords: cycling,bike,cyclist,race,bicycle,road,francis,cade,x-lab,xds,zipp,enve,shimano,specialized,aethos,cannondale,scott,addict
Parts Mentioned
XDS X-LAB AD9/RT9
Summer ready / Winter ready sale
Complete BikeXDS X-LAB AD9/RT9
Created: March 25, 2026The reviewer tested the XDS X-LAB AD9/RT9, a lightweight carbon road bike with disc brakes. They praised its low weight (6.39 kg) and stiff frame but criticized the harsh ride quality, which they attributed to the carbon-spoked Branta wheels. The frame finish was easily damaged, though XDS claimed to have addressed this in later batches. The bike's limited size range and the wheels' resemblance to Zipp were also noted as negatives.
AI-Summary
Pros
- Extremely light frame (550 g) and overall bike weight (6.39 kg)
- Stiff frame with good handling
- Round tube design reduces crosswind sensitivity
- Threaded BSA bottom bracket and UDH derailleur hanger
- Free swapping of cockpit and cranks after order
- Lower price compared to competitors like Specialized and Scott
Cons
- Harsh ride quality, especially on rough roads
- Carbon-spoked wheels are uncomfortable and feel like 'Flintstones car'
- Frame finish is easily scratched or marked (though later batches have improved coating)
- Only four sizes available, with largest equivalent to 56 cm
- Wheels have branding similar to Zipp, causing confusion
- Stock components (cranks, bars) are very short/narrow, likely for weight saving rather than fit
