Aceoffix Y5 16inch 349 5 speed Folding Bike

The Aceoffix Y5 is the entry model in Aceoffix's aluminium tri-fold bike range, with 16-inch (349) wheels, 5 speeds, front and rear rim brakes, and 74 mm front / 112 mm rear dropout spacing, the same as an original Brompton. It comes in 8 colours and suits riders on a budget who want a first tri-fold for short city trips, with room to upgrade parts later.

At a Glance

• Category: adult tri-fold folding bike (16-inch / 349 wheels, 5-speed), the Brompton-style bikes Hong Kong riders call "guo bu" or "aluminium Brompton"
• Brand: Aceoffix (China; also written ACEOFFIX)
• Where it sits: the entry line of Aceoffix's three aluminium folding bike lines (the S5 focuses on upgraded parts, the C5 on low weight)
• Key feature: 74 mm front and 112 mm rear dropout spacing, the same as a Brompton, giving more freedom when upgrading wheels or gearing
• Drivetrain: 5-speed, 50T hollow one-piece crankset (Jollymap's review lists an 11–19T cassette)
• Brakes: front and rear rim brakes (caliper type)
• Handlebar: low M-bar as standard, to avoid over-reaching
• Best for: short city trips, first-time tri-fold buyers, riders who like colour choice and customising

What Problem Does It Solve?

Plenty of riders love how small a Brompton-style tri-fold packs down, but a genuine Brompton is not within everyone's budget. The Y5 is Aceoffix's aluminium tri-fold for the entry market: it keeps the three-way fold, with the front wheel hooking under the frame so the folded bike stands steadily, and it keeps Brompton-matching dropout widths, so your first folding bike does not have to be expensive and still leaves room to upgrade.

Who Is It For?

• Good fit: riders who mostly make short, flat trips around town and often fold the bike for public transport or to store it at home or in the office. Jollymap's review found the low stock handlebar puts the grips in a more natural position, which particularly suits riders around 150–165 cm tall (including many women) who tend to over-reach on Brompton-style bikes.
• If low weight matters most: for example if you carry the bike upstairs every day, compare the Aceoffix C5 16inch 349 5 speed Carbon Fork Folding Bike, with a 6069 aluminium frame and T800 carbon fork, quoted by the manufacturer at 7.5 kg (without pedals and front carrier block).
• If you want disc brakes and more gears: consider the Aceoffix D10 18inch 355 10 speed Carbon Fork Folding Bike, with 18-inch (355) wheels, 10 speeds and IIIPRO hydraulic disc brakes.

Features

Brompton-matching dropouts for easier upgrades

The Y5 has 74 mm front and 112 mm rear dropout spacing, the same as an original Brompton. Jollymap's review notes that many wheelsets, derailleurs, cassettes and brake upgrade kits designed for the Brompton can be fitted to the Y5. Actual fit still depends on the individual part, so please contact us to confirm before ordering upgrade parts.

Three-way fold with a hooked front wheel

The Y5 follows the tri-fold layout: the front wheel tucks under the frame, and the catch between the stem and fork uses the same reverse-hook design as an original Brompton, so the folded bike stands steadily and is more stable to push and store. In Jollymap's hands-on test, people new to folding bikes picked up the folding steps after one or two tries.

Low M-bar to avoid over-reaching

On some Brompton-style bikes the stem is tall and the bar sits far away, so smaller riders end up over-reaching, which tires the wrists and shoulders. The Y5 comes with a low M-bar that brings the grips closer to the body, and the brake levers sit at a more vertical angle so they do not hit the frame when folding.

Rear rack for pushing the bike when folded

According to Jollymap's review, the Y5 comes with a rear rack as standard, so the folded bike rolls steadily without buying extra rollers; aluminium hinge clamps, a seatpost clamp and a chain tensioner are also standard, and the hinge clamps and seatpost clamp are the same grade as on the C5. Specification may vary by batch, so please contact us to confirm before ordering.

5 speeds for city ups and downs

The Y5 uses the same 16-inch (349) wheel size as the Brompton, with Aceoffix 5-speed gearing and a 50T hollow one-piece crankset; according to Jollymap's review the cassette is 11–19T, a range enough for everyday city commuting and short leisure rides. The left pedal is quick-release, which makes the folded bike easier to store.

8 colours to choose from

The Y5 comes in Blue, Green, Purple, Yellow, Navy, Khaki, Pink and Mint. Aceoffix also offers a range of brightly coloured metal upgrade parts, so you can mix and match to taste.

How to Choose an Aceoffix Model

The table below compares five Aceoffix models: the Y5 is the entry line, the S5 focuses on upgraded parts, the C5 focuses on low weight (in 5-speed and 7-speed versions), and the D10 is the 18-inch disc-brake model.

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.

• Want more upgraded parts: the Aceoffix S5 16inch 349 5 speed Folding Bike is also 16-inch and 5-speed, and is listed with a carbon swallow-style handlebar, carbon saddle, Schwalbe Kojak tan-wall tyres and SAPIM spokes.
• If low weight matters most: the Aceoffix C5 16inch 349 5 speed Carbon Fork Folding Bike has a 6069 aluminium frame and T800 carbon fork; the manufacturer quotes 7.5 kg (without pedals and front carrier block), and Jollymap weighed it at 8.15 kg with pedals and carrier block.
• Want 7 speeds: the C5 also comes in a 7-speed version, on three product pages in Matt Grey, Purple and Chrome, with the same specification in different frame colours.
• Want disc brakes, or ride the odd paved trail or gravel path: the Aceoffix D10 18inch 355 10 speed Carbon Fork Folding Bike has 18-inch (355) wheels, 10 speeds (11–34T) and IIIPRO hydraulic disc brakes.

To find out more, read Jollymap's Aceoffix Y5 review, Aceoffix C5 review and Aceoffix D10 review (articles in Chinese).

Related Aceoffix Accessories

The following Aceoffix accessories are available on the Jollymap online shop. Please contact us to confirm they fit your Y5 before ordering:

• Aceoffix Rack with Easy Wheel (for 16 inch)
• Aceoffix Easy Wheel (pair)
• Aceoffix Chain Tensioner
• Aceoffix Brake Calipers

Jollymap Recommends

The Y5 shares the Brompton's dropout spacing, but whether a Brompton or third-party part fits can still depend on the part model and production batch. Planning to upgrade the handlebar, wheels or gearing, or add accessories? Please contact us to confirm before ordering. Send us your bike colour, the part model and photos via the online shop's "Chat with us" or the Jollymap Facebook page, and we will check compatibility for you first.

Specifications

Brand	Aceoffix
Model	Y5 (16-inch 349, 5-speed), entry line
Frame	Aluminium alloy, tri-fold design
Dropout spacing	74 mm front, 112 mm rear (same as Brompton)
Wheel size	16 inch (349, for short-distance riding)
Rims	Aluminium alloy
Gearing	Aceoffix 5-speed, 11–19T cassette (per Jollymap's review)
Crankset	Hollow one-piece crankset, 50T chainring
Brakes	Front and rear rim brakes (caliper type)
Handlebar	Low M-bar
Seatpost	Aluminium alloy, 31.8 x 550 mm (per a Thai dealer listing)
Pedals	CNC aluminium pedals, quick-release left pedal (listed in the original product information as single-sided folding pedals)
Standard equipment	Rear rack, aluminium hinge clamps, seatpost clamp, chain tensioner (per Jollymap's review; may vary by batch)
Weight	No consistent published figure
Suitable rider height	150–200 cm
Gender	Unisex
Colours	Blue, Green, Purple, Yellow, Navy, Khaki, Pink, Mint

Specification sources: product information published by Aceoffix dealers and Jollymap's Y5 review. Aceoffix has no global official spec sheet, and actual components may vary slightly by production batch.

FAQ

What is the difference between the Aceoffix Y5 and C5?

The C5 prioritises low weight, while the Y5 is the entry line. The C5 has a 6069 aluminium frame and T800 carbon fork, quoted by the manufacturer at 7.5 kg (without pedals and front carrier block); Jollymap's review describes the C5 as using more carbon parts, while the Y5 keeps costs under control and comes in 8 colours. Both use 16-inch (349) wheels and 74 mm front / 112 mm rear dropout spacing, and the C5 also comes in a 7-speed version.

What is the difference between the Aceoffix Y5 and S5?

Both are 16-inch (349) 5-speed aluminium tri-folds with front and rear caliper rim brakes; the difference is positioning. The Y5 is the entry line and comes with a low M-bar; the S5 focuses on upgraded parts and is listed with an H30 carbon swallow-style handlebar, carbon saddle, Schwalbe Kojak tan-wall tyres and SAPIM spokes. See the Aceoffix S5 16inch 349 5 speed Folding Bike.

What rider height does the Aceoffix Y5 suit?

The product information lists a rider height of 150–200 cm. Jollymap's review found the low stock handlebar brings the grips closer, which particularly suits riders around 150–165 cm who tend to over-reach on Brompton-style bikes.

Can the Aceoffix Y5 use Brompton parts?

Some, yes. The Y5 has 74 mm front and 112 mm rear dropout spacing, the same as an original Brompton, and Jollymap's review says many wheelsets, derailleurs, cassettes and brake kits designed for the Brompton can be fitted. Because individual parts and production batches differ, please contact us to confirm fit before ordering.

Can the Aceoffix Y5 be upgraded to 7 speeds?

Jollymap's review mentions that the Y5 drivetrain has room to be upgraded to 7 speeds, but the bike on this page is the 5-speed version and an upgrade needs additional parts. Please contact us to confirm which parts are needed and whether they fit. If you want 7 speeds from the start, consider the Aceoffix C5 16inch 349 7 speed Carbon Fork Folding Bike - Matt Grey.

Can I take the Aceoffix Y5 on the MTR or a bus?

The MTR depends on the folded size, and buses are generally restricted. The MTR limits hand luggage to a total length, width and height of 170 cm, measured on the folded size including pedals; the Y5 dimensions diagram only shows the folded length and height (printed as 585 CM and 620 CM, which Jollymap infers from the scale to be about 58.5 cm and 62 cm; not a manufacturer-confirmed figure) and no width, so the total cannot be confirmed. If you plan to take it on the MTR, please contact us to confirm the folded size before ordering. On franchised buses, section 14 of the Public Bus Services Regulations (Cap. 230A) only allows items within 5 kg and 0.1 cubic metres, so folding bikes are generally restricted and it is up to the bus company; minibuses are not guaranteed either.

Is the Aceoffix Y5 good for beginners?

Yes. The Y5 is Aceoffix's model for the entry market; in Jollymap's hands-on test, people new to folding bikes picked up the folding steps after one or two tries, and 5 speeds cover typical city riding. If your route has more hills, compare the 10-speed D10.

How much does the Aceoffix Y5 weigh?

Aceoffix has not published a consistent weight. Overseas dealers quote either 8 kg or 9 kg without stating what is included, and Jollymap has not weighed the Y5. If weight matters most, compare the C5, quoted by the manufacturer at 7.5 kg (without pedals and front carrier block).

Where is Aceoffix from, and where can I buy the Y5 in Hong Kong?

Aceoffix is a Chinese brand focused on Brompton-style aluminium tri-folds. The Aceoffix Y5 is available on the Jollymap online shop and in store; before choosing a colour or accessories, you can contact us via "Chat with us" on the online shop or our Facebook page.

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