Cortina U4 Men's Bike 28" 61cm 7S - Mat Jet Black

EAN 8719461065092
Brand: Cortina
Product Model: 931490

In Stock : +/- 4-8 Business Days

Information
Size Chart
Supplier Info

This men’s bike from Cortina is designed for practical daily transportation, showcasing the robust character that the U4 series is renowned for. The high aluminum frame provides a solid, classic transport-bike feel, while the 28-inch wheels, Shimano Nexus 7-speed hub gear, and roller brakes make it ideal for commuting, shopping trips, and everyday city riding. The front carrier, double kickstand, steering lock, hub dynamo lighting, and AXA ART** lock transform it into a reliable bike for riders seeking comfort, carrying convenience, and low-maintenance reliability in one package.

- 28-inch men’s transport bike with a sturdy aluminum frame for everyday city use
- Shimano Nexus 7-speed hub gear offers practical shifting for commuting and urban riding
- Shimano roller brakes provide reliable braking with low-maintenance performance
- Equipped with a front carrier, double kickstand, and steering lock for practical transport use
- Hub dynamo lighting keeps the bike ready for daily riding without the need for separate batteries
- Fitted with puncture-protected Cortina Canberra tires and AXA Atlas ART** lock for added everyday peace of mind

Specifications
Brand: Cortina
Model: U4 Transport
Type: Men's bicycle
Wheel Size: 28"
Tyre Size: 28 x 1.75"
Tyres: Cortina Canberra
USB Charging Option: No
Handlebar Lock: Yes
Frame Size: 61 cm
Frame Model: High
Maximum Load: 120 kg
Target Group: Men
Drivetrain: Chain
Gear System: Hub gear
Gears: Shimano Nexus 7-Speed
Number of gears: 7
Brake System: Dual hand brake
Brake Type Rear: Roller brake
Front fork: Fixed
Stem: Fixed
Seatpost: Fixed
Saddle: Selle Royal Witch
Grips: Cortina Dakar
Stand: Double kickstand
Bell: Yes
Lock: AXA Atlas ART**
Lighting Front: Cortina Amsterdam
Power Supply: Hub dynamo
Model Year: 2026
Frame Material: Aluminium
Color: Jet black matte

Children are generally taught to ride a bike at an early age.
The right size bicycle allows for a comfortable and safe riding position for children and teens, and stimulates maximum performance of the muscles.
Aside from being less tiring and preventing overexertion of the knees, the right size bike encourages regular bike use and cycling in general.
This size is usually based on the wheel diameter.

Children's Bicycle Size Chart
Age (Years)	Clothing Size	Length	Recommended Children's Bike Size
2 - 4	98 - 104	± 95 cm	12 inch
3 - 5	100 - 106	± 100 cm	14 inch
4 - 6	104 - 110	± 105 cm	16 inch
5 - 7	110 - 116	± 110 cm	18 inch
6 - 8	116 - 122	± 115 cm	20 inch
7 - 9	122 - 128	± 122 cm	22 inch
8 - 12	128 - 140	± 130 cm	24 inch
10 - 14	140 - 152	± 145 cm	26 inch

This sizing chart for children's bicycles is based on age and length.
Not everyone is the same length at a certain age, so it’s advisable to determine the bicycle size based on length.
The most important factor in determining the right bike size, is the inseam length.

Body Length	Inseam Length	Recommended Bike Size
120 - 140 cm	<52 cm	16 inch
52 - 74 cm	20 inch
> 74 cm	24 inch

140 - 160 cm	< 62 cm	20 inch
62 - 80 cm	24 inch
> 80 cm	26 inch

> 160 cm	< 74 cm	24 inch
> 74 cm	26 inch

Most children that are 120 to 140 cm tall can ride a 20 inch bike, while children between 140 and 160 cm tall can ride a 24 inch bike.
A 26 inch bike is generally suitable for teenagers who are over 160 cm tall.
The right frame height is also very important: it is the first step to finding the correct riding position.
A bicycle frame that is too small or too large can lead to limited height adjustment options, which in turn may lead to an inconvenient height difference between the saddle and handlebars.
Use the inseam length to determine which frame size is right for you.
You can do this by measuring the inside of your leg, from the top of the thigh down to the floor.

Adult Bicycle Size Chart

Inseam Length		Recommended Frame Size
≈ 66 cm		43 cm
≈ 74 cm		48 cm
≈ 77 cm		50 cm
≈ 78 cm		51 cm
≈ 80 cm		52 cm
≈ 83 cm		54 cm
≈ 85 cm		55 cm
≈ 86 cm		56 cm
≈ 89 cm		58 cm
≈ 91 cm		61 cm
≈ 93 cm		65 cm

Choose the frame size closest to your results.
When in doubt, it’s best to pick the smaller frame size.
If you have any questions about determining the right bicycle size, you can always give us a call or send us an e-mail.