Alpina Trial Boys Bicycle 20" Brake Hub - Matt Petrol Blue

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	Approximate 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
52-75 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
Approximate  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. 

Alpina produces awesome children’s bikes for boys and girls aged 3 to 12 years old.
Quality and safety are of paramount concern to Alpina.
And since children want their bicycles to look cool and reflect their personality, Alpina also pays a lot of attention to the concept and design of its children's bicycles.

When your child is learning how to ride a bike, it’s important to have the right children’s bicycle: high-quality materials poured into a modern and safe design.
Alpina understands the need for safety and fun and equips all Alpina bicycles with excellent brakes and lights.