Menu Menu
United Kingdom / GBP
Select your language uses cookies to analyze and improve the use of this website. and third parties use cookies to collect information about your visit to this website and your personal interests, for example to show you customized ads. By clicking "Hide this notification" or by continuing to use this website, you are agreeing to the use of cookies.

Welcome to! You appear to be visiting us from United States. Do you want to change the country setting to United States?

  • Fast delivery
  • International delivery
  • 8.9/10 customer reviews
  • 2 year warrantee
  • Webshop Trustmark
£ 555.98

Cortina U4 Men's Bike 28" 56cm 3S Brake Hub - Matt Jet Blac

  • EAN 8719461036023
  • Brand: Cortina
  • Product Model: 698580
In Stock +/- 4 Business Days

The Cortina U4 is your best friend for your daily groceries, during a shopping day or a sleepover.
Everything can be carried in a basket or crate on your front carrier.
Due to the many colors and designs, there is always a bicycle that perfectly suits your needs!
Do you need to cycle more or do you just want an electric bicycle, then there is also the E-U4 Transport.

Brand: Cortina
Color specific: Jet Black Matt
Frame height: 56
Color code: UZZ 69005 Matt
Gears: 3
Frame type: Men
Gear system brand: Shimano
Braking system: Coaster brake
Gear system type: Hub
Wheel size: 28
Drive: Chain
Luggage carrier: Rear/Front
Bicycle bell: Yes
Easyfit carrier: No
Frame material: Aluminum
Suitable for child seat: Rear
Grips: Cortina Dakar
Weight: 21
Color code paint pen: Jet Black UZZ 69005 Matt
Front brake system brand: Shimano
Model year: 2021
Brake type: Coaster brake
Kickstand: Double-legged kickstand
Stem: Fixed
Handlebar lock: Yes
Tire type: Cortina Canberra with anti-puncture coating
Front braking system type: RK
Lock: AXA Solid Plus ART **
USB charging option: No
Taillight: Union 4309, batteries
Headlight: Cortina Amsterdam 18 lux, batteries
Front carrier: Yes
Fork: Fixed
Saddle: Selle Royal Witch
Seatpost: Fixed
Color: Black

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

Children's bicycles size chart
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

Cycling lesson
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 Adults Cycling Size Chart
   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. 


Cortina hit the market in the 1970s with a reliable range of city bikes and stands for quality, no-nonsense and reliability.

In 2006 Cortina began marketing itself as a true experience brand and by closely following market trends and developments, it was able to come up with a range of trendy lifestyle bikes, combining design, comfort, quality and affordability.


Although the first years did prove difficult, Cortina achieved true success with its 2008 collection, when it introduced the Cortina mothers bicycle and its accessories.
The following year Cortina really hit the jackpot with the Cortina Transport U4.
Cortina’s success continued in 2010 and today it is one of the fastest growing bicycle brands in the country.


In 2012 Cortina started a fashion campaign, collaborating with designer Michael Barnaart van Bergen.
Just like the clothing you wear, your bicycle is an expression of who you are.
Barnaat van Bergen designed five outfits inspired by the 2013 bicycle collection and a contest was held to find five models to be the new face of Cortina.
The brand plans to continue their fashion campaign next year.


Today Cortina has three product lines with various models:

  • Originals: authentic bicycles with a retro look
  • Utility: modern transport bikes
  • Metropole: sporty urban bicycles 

Your Cortina, your style.

This product cannot be shipped to the following countries: United Kingdom
  • Over 120.000 products
    Over 120.000 products

  • International delivery
    International delivery

  • Fast service with a rating of 8.9/10
    Fast service with a rating of 8.9/10

  • Over 3 million satisfied customers
    Over 3 million satisfied customers

  • A 30-day cooling-off period and 2-year warranty
    A 30-day cooling-off period and 2-year warranty
Do you have any questions?

Our team of enthusiastic colleagues is ready to help you.

+31 (0)70 - 300 00 44
Do you have any questions?
  • Fast delivery
  • International delivery
  • 8.9/10 customer reviews
  • 2 year warrantee
  • Webshop Trustmark
Back to top