Aceoffix C5 16inch 349 7 speed Carbon Fork Folding Bike - Matt Grey

The Aceoffix C5 16-inch 349 7-speed Carbon Fork Folding Bike is a tri-fold bike with a 6069 T6 aluminium frame and a T800 carbon fork. Aceoffix quotes 7.5 kg without pedals and front carrier block, and it has two more gears than the 5-speed C5. It uses the same tri-fold design as a Brompton, with the same 74 mm front and 112 mm rear spacing, making it a good fit for commuters who want an ultralight trifold with a little more gear range for climbs.

Key Facts

• Category: ultralight tri-fold folding bike (adult, 16-inch / 349 wheels), 7-speed
• Brand: Aceoffix (Chinese brand focused on aluminium trifold bikes)
• Frame / fork: 6069 T6 aluminium frame and rear triangle, T800 carbon fork, threadless headset
• Gears / brakes: 7-speed derailleur; front and rear rim brakes (caliper)
• Weight: 7.5 kg without pedals and front carrier block (Aceoffix figure, about 2% tolerance)
• Rider height: 140–185 cm
• Best for: riders who fold and carry the bike up stairs every day, care most about weight, and have a few short climbs on their commute

The Problem It Solves

Trifold bikes pack small, but a steel Brompton weighs about 11.2 kg, which gets tiring on stairs every day, and the lighter titanium T-Line is expensive. The C5 combines a 6069 aluminium frame with a carbon fork, carbon handlebar and light components to bring the bike down to 7.5 kg (without pedals and carrier block). The 7-speed version adds two gears over the 5-speed C5, so you have more options on flyovers and MTR exit ramps.

Who It Suits

• Good fit: riders 140–185 cm tall who fold every day or carry the bike up stairs; anyone who wants a Brompton-style fold and Brompton-compatible accessories.
• Flat routes only: the 5-speed Aceoffix C5 16inch 349 5 speed Carbon Fork Folding Bike is simpler.
• Maybe not: if you often ride in the rain, want stronger braking or more gears, note that the C5 uses rim brakes; the 10-speed, full hydraulic disc Aceoffix D10 18inch 355 10 speed Carbon Fork Folding Bike is worth a look.

Key Features

6069 aluminium frame with thicker walls and steel sleeves

The head tube and rear triangle are 6069 T6 aluminium, 20–40% harder than common 6061 alloy, with better fatigue resistance and fracture toughness. For stiffness the main tube is larger (about 16.5 cm circumference) with 2.5 mm walls (typically about 1.6 mm), and steel sleeves inside the tubes at the folding points add strength.

T800 carbon fork and threadless front end

The T800 carbon fork is paired with a threadless head structure; Aceoffix says that together with the large-diameter fork this gives a 60% increase in strength, while the specially designed pivot keeps folding smooth and controls vibration when riding. The headset is hidden, and when folded the stem locks back into the headset area.

Lightweight parts: carbon bar and easy wheels

The C5's mini M-bar, fork and easy wheels are carbon; the seat clamp and hinge hardware are aluminium; and the pedals are CNC single-side quick-release. These are the keys to the 7.5 kg figure.

Replaceable hinge and Brompton spacing

The hinge is a separate part that can be replaced if it wears. Front spacing is 74 mm and rear 112 mm, the same as a Brompton, so many Brompton accessories fit.

Aceoffix Models Compared

Here is how the Aceoffix models compare on published specs:

Sources: product information published by Aceoffix dealers in Hong Kong and overseas, and Jollymap review articles. Aceoffix has no global official spec sheet. "—" means consistent public data is not available.

The same C5 7-speed is also listed in other frame colours: Aceoffix C5 7 speed Carbon Fork Folding Bike - Chrome and Aceoffix C5 7 speed Carbon Fork Folding Bike - Purple.

Which other Aceoffix model suits you?

• Closest model: Aceoffix C5 16inch 349 5 speed Carbon Fork Folding Bike - the same 6069 aluminium frame, T800 carbon fork, 16" (349) wheels and front and rear rim brakes (caliper) as this bike, with two fewer gears (5-speed, 11–19T). Aceoffix quotes the same 7.5 kg (without pedals and front carrier block); Jollymap weighed the 5-speed at 8.15 kg with pedals and front carrier block.
• Want disc brakes and a wider gear range: Aceoffix D10 18inch 355 10 speed Carbon Fork Folding Bike - 18" (355) Kenda knobby tyres, 10-speed (11–34T) and IIIPRO hydraulic disc brakes; 8.5 kg factory figure, about 8.7 kg as weighed by Jollymap with pedals.
• Upgraded-spec series: Aceoffix S5 16inch 349 5 speed Folding Bike - also 16" (349) wheels, 5-speed and front and rear rim brakes (caliper), listed with a carbon handlebar and Schwalbe Kojak tyres; 8 kg factory figure (pedals not specified).
• Entry-level series: Aceoffix Y5 16inch 349 5 speed Folding Bike - also 16" (349) wheels, 5-speed and front and rear rim brakes (caliper); for first-time tri-fold buyers or riders who plan to upgrade parts over time.

Further reading (Jollymap articles, in Chinese): Aceoffix C5 build, components and measured weight, Aceoffix Y5 review, Aceoffix D10 review and measured weight.

Jollymap's Advice

With Brompton-style spacing, the C5 can take the Aceoffix Rack with Easy Wheel for 16 inch or replacement Aceoffix Easy Wheel (pair). Fit can vary slightly between production batches, so please contact us before ordering: chat with us or message our Facebook page with your bike's colour, a photo and your height.

Product Information

Brand	Aceoffix
Handlebar type	Carbon handlebar
Applicable scenario	Commuting
Gear system	7-speed
Folding mechanism	Triple folding
Pedal type	CNC one-sided quick-release pedals
Frame material	Aluminium alloy (head tube and rear triangle 6069 T6)
Fork material	Carbon fiber T800
Rim material	Aluminium alloy
Rim size	16 inches (349, for short-distance riding)
Spacing	Front 74 mm, rear 112 mm
Weight	7.5 kg (without pedals and front carrier block, about 2% tolerance)
Suitable rider height	140–185 cm
Applicable gender	Unisex
Brake type	Front and rear rim brakes (caliper)
Colours (Jollymap)	Matt Grey, with Gold, Red, Purple, Silver, Blue, Orange or Pink accent options

Specifications source: Aceoffix product information and Jollymap review articles. Product images are for reference purposes only. Actual product specifications and colors may vary between production batches. Please contact us for detailed information.

FAQ

How much does the Aceoffix C5 7-speed weigh?

Aceoffix quotes 7.5 kg without pedals and front carrier block, with about 2% tolerance. For reference, Jollymap weighed the 5-speed C5 at 8.15 kg with pedals and carrier block; we have not weighed the 7-speed version.

What is the difference between the C5 7-speed and 5-speed?

The gearing: the 7-speed has two more gears for climbs. Both use 16-inch 349 wheels, a 6069 aluminium frame, a carbon fork and front and rear rim brakes, and Aceoffix quotes 7.5 kg for both. See the Aceoffix C5 16inch 349 5 speed Carbon Fork Folding Bike.

Aceoffix C5 or D10: which should I choose?

Choose the C5 if weight matters most and your routes are mostly flat or short climbs; choose the D10 if you often ride in the rain and want disc brakes and more gears. The D10 has 18-inch 355 wheels, 10 speeds and full hydraulic disc brakes, with a factory weight of about 8.5 kg (Jollymap measured about 8.7 kg with pedals); see the Aceoffix D10 18inch 355 10 speed Carbon Fork Folding Bike.

What rider height does the Aceoffix C5 suit?

Riders 140–185 cm tall, men and women alike.

How does the C5 relate to a Brompton? Can I use Brompton accessories?

The C5 uses a similar tri-fold design, and its 74 mm front and 112 mm rear spacing match a Brompton, so many Brompton accessories fit. Actual fit can vary slightly by production batch, so contact us before ordering.

Where is Aceoffix from?

Aceoffix is a Chinese brand with Y5, S5 and C5 aluminium trifold ranges; the C5 is the range's lightweight model.

Does the Aceoffix C5 have disc brakes?

No. The C5 uses front and rear rim brakes, which helps keep the weight down; if you need disc brakes, consider the Aceoffix D10.

Where can I buy the Aceoffix C5 7-speed in Hong Kong?

Jollymap sells it online and in our shop; besides Matt Grey on this page, there are Chrome and Purple listings. Chat with us if you'd like to confirm colour or accessories before ordering.

Specifications and components follow the manufacturer's latest release and may change without notice. If in doubt, please contact us to confirm before ordering.

Last updated: October 2026