Race Spec Jointless Carbon Frame | CarbonSpeed Gran Turismo
Hambini
June 20, 2026
The CarbonSpeed Gran Turismo is one of the most interesting road bike frames I've tested recently. Unlike most carbon frames which are manufactured in multiple sections and bonded together, the Gran Turismo uses a true one piece construction, resulting in a cleaner internal finish, simplified cable routing and potentially improved structural efficiency.
In this video I take a detailed look at the engineering behind the frame, the build quality, assembly experience and the areas where CarbonSpeed have got things right and where they could still improve.
Topics covered:
• One piece carbon frame construction
• EPS moulding and internal quality
• T47 bottom bracket interface
• Headset and cockpit design
• Geometry and fit considerations
• Tyre clearance
• Real world build experience
• Manufacturing quality compared with mainstream brands
• Aerodynamic observations
• Customer service and purchasing experience
I also discuss how the Gran Turismo compares with frames from Winspace, LightCarbon, Elves and other direct to consumer manufacturers, along with why one piece construction remains relatively uncommon despite its technical advantages.
If you're looking for an aero road bike frame without spending several thousand pounds on a mainstream brand, this may be one of the most interesting options currently available.
#CarbonSpeed #GranTurismo #RoadBike #Cycling #BikeReview #ChineseCarbon #AeroBike #CarbonFrame #BikeEngineering #Hambini
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CARBONSPEED: https://www.xmcarbonspeed.cc/
Parts Mentioned
XMCS Gran Turismo
FrameXMCS Gran Turismo
Created: January 20, 2026The reviewer discusses the XMCS Gran Turismo (also referred to as Carbon Speed) frame, highlighting its one-piece construction, competitive pricing, and overall high frame quality. He notes that the frame is made in a single mold, which is technically complex and results in a smooth interior with no overlapping joints, making cable routing easy. The frame is EPS molded, leading to a better finish. However, he experienced issues with some finishing components, such as a poorly threaded compression nut and a faulty upper headset bearing. Despite these, he praises the customer service and considers the frame a high-quality product that undercuts competitors like Winspace and Elves.
AI-Summary
Pros
- One-piece frame construction is advanced and results in a smooth interior
- EPS molding gives a good finish with no ripples
- Frame quality is extremely good overall
- Cable routing is easy due to no overlapping joints
- Competitive pricing undercutting similar frames
- Excellent customer service from Peter at Carbon Speed
- T47 bottom bracket with no issues
- Good tire clearance
Cons
- Compression nut had poor threading, required tapping
- Upper headset bearing needed replacement quickly
- One of the plug holes was slightly elliptical and needed cleaning
- Finishing gear (fixtures) is slightly lacking in quality
Where to Buy
