Carbon bike: what to know before you choose one

What is a carbon bike?

A carbon bike is built around a frame made of carbon fibre reinforced polymer, a composite in which carbon fibres carry the loads and resin holds them together. The fibres are strong and stiff along their length, so engineers place them in precise directions and layers to give each part of the frame the behaviour it needs.

This arrangement is called the layup. Two frames made from the same fibre can ride very differently, because the number of layers, their orientation and the shape of the tubes matter more than the label on the fibre.

Carbon bike: the real advantages

The advantages of a carbon bike come from the freedom carbon gives to the designer: less weight for the same stiffness, and the ability to make one area firm and another more forgiving.

• WeightA carbon frame is generally lighter than a metal frame of comparable stiffness. You notice it on climbs, when accelerating and when lifting the bike.
• Stiffness where it countsThe bottom bracket and head tube can be made stiff, so pedalling and steering feel precise and direct.
• Comfort over distanceSeatstays and seatpost can be designed to filter road vibration, which reduces fatigue on long rides.
• Shapes and integrationCarbon can be moulded into aerodynamic profiles, with cables routed inside the frame and cockpit for a cleaner bike.

The limits of carbon

A carbon frame is strong in normal use, but it is not automatically the best choice for every rider. Its limits are mostly about cost and how it reacts to concentrated impacts.

• PriceCarbon frames cost more to design and produce, so carbon bikes are generally more expensive than aluminium ones.
• ImpactsCarbon handles riding loads very well, but a sharp blow, a fall onto a kerb or a crushing clamp can damage it without visible marks. Any hard impact deserves an inspection.
• TighteningBolts and clamps on carbon parts must be tightened to the specified torque, ideally with a torque wrench and carbon assembly paste.
• RepairA damaged carbon frame can often be repaired by a specialist, which is rarely possible with a dented aluminium tube. It still takes time and expertise.

Carbon does not rust. Corrosion on a carbon bike, when it appears, concerns metal parts such as bolts, bearings and the drivetrain.

Monocoque or tube-to-tube: how carbon frames are made

Carbon frames are made in two main ways: as a monocoque, moulded as one main piece, or tube-to-tube, where individual carbon tubes are cut, joined and wrapped by hand. Both can produce excellent frames; they serve different goals.

In the Stajvelo range, the Nomades and the Mirabeau use a UD 800 carbon monocoque frame. The Beau Rivage is a hand-built carbon road bike made tube-to-tube in Italy, offered in five standard sizes or, after a postural analysis in Monaco, as a made-to-measure frame. It is the only Stajvelo model available made to measure.

What T700 or T800 means on a carbon frame

Names such as T700 or T800 refer to grades of carbon fibre, which differ in strength and stiffness. A higher grade allows a stiffer or lighter part, but the fibre grade alone does not make a good frame: the layup, the moulding quality and the way the frame is checked count just as much.

Carbon or aluminium?

A carbon frame is the better choice when lightness and a refined ride are priorities; an aluminium frame is often the better choice for a tighter budget or demanding everyday use. Aluminium is robust, simple and good value, and a well-designed aluminium bike with good tyres can be very comfortable.

Many bikes combine both. The Grima, our urban e-bike, pairs an aluminium frame with a carbon fork. For Gravel and All-Road riding specifically, our guide Gravel or All-Road, carbon or aluminium compares the two materials in detail.

Carbon road bike, gravel bike or carbon e-bike?

The benefit of carbon depends on the type of bike. On a non-electric road or gravel bike, weight and ride feel are felt on every climb. On an e-bike, carbon keeps a heavier system lighter and livelier, which makes it easier to handle, carry and ride without assistance.

If you hesitate between assistance and a classic bike, read electric road bike or road bike: how to choose. All these models belong to our collection of custom carbon bikes, personalised in colours and components.

What to check before buying a carbon bike

Before buying a carbon bike, check how it fits you and how it will be supported, not only its weight. A light frame in the wrong size will never be comfortable.

• Fit and sizeFrame size, reach and stack decide your position. A proper fitting matters more than a few hundred grams.
• Intended useRoad, All-Road, Gravel or electric: the layup and geometry are designed for one use. Check tyre clearance if you ride on rough surfaces.
• IntegrationInternal routing looks clean; ask how easy the bike is to service and adjust.
• Assembly and after-salesA carbon bike should be assembled with the right torque and checked by a workshop that knows it.
• Test rideRide the bike before deciding. Two carbon frames can feel very different on the same road.

Our guide on how to test ride a bike before you buy lists what to look for during a ride.

How to look after a carbon bike

Looking after a carbon bike mostly means avoiding concentrated loads on the frame and tightening carbon parts correctly. With these habits, a carbon frame can give many years of riding.

• TorqueUse a torque wrench for stem, handlebar and seatpost bolts, with carbon assembly paste on clamped surfaces.
• WorkstandClamp the seatpost, never the frame tubes.
• TransportProtect the frame from straps and rubbing, and avoid racks that clamp the top tube.
• After a fallHave the frame, fork and cockpit inspected, even if nothing is visible.
• CleaningWater and a mild cleaner are enough. Avoid high-pressure jets on bearings.

For service intervals, see how often you should service your bike, or bring your bike to our bike workshop in Monaco.

Two approaches to carbon: the hand-built Beau Rivage and the Rocchetta, both assembled in our atelier in Fontvieille, Monaco.

Frequently asked questions