The ultimate urban bike for dynamic kids

Bike Assembly Required

Bicycles require some assembly. This may include fitting the wheels, handlebars, pedals, seatpost and seat, and front brake caliper. This should not be attempted by the customer unless familiar with modern bicycle assembly and should otherwise be carried out by a competent bicycle mechanic. This includes bicycles sent to our stores for in store pick up, however, your local Bikebug store can assemble the bicycle for a fee, please contact your local Bikebug store after placing your order.

620x3i | Age: 10 - 14 years | Height: 142.5 - 175 cms

Simplicity and functionality are the hallmarks of this rider-friendly bike. Our unique ergonomic riding position and geometry, along with premium components is unprecedented for a bike of this size.

Shimano ultra smooth 3 speed gears, along with our responsive handling to increased safety at speed, make this bike easy and fun to ride. Just 12kg.

Ability Level: Expected To Know How To Ride With The Safety Of Internal Gears And Footbrake.

Design - The 620x3i is uniquely designed for children and is not a scaled down adult bike. Every single component has been considered, tested, custom sized and tuned to suit our rider's profile.
Our unique ergonomic riding position and geometry along with our selection of premium components together offer a range of riding positions and adjustability unexpected at this size.
Performance - Shimano ultra smooth and class leading efficient internal 3 speed gears couldn't be easier to use.
Strong wheels, durable tyres, tough tubes, comfortable ergonomic saddle, custom shaped handlebars, short reach and long reach pedal position, sealed bearings, grippy pedals and so so much more really separate ByK from the regular offering.
Safety - From our responsive handling to increased safety at speed, the ByK 620 range sets new standards in safety. The innovative frame improves balance and control to help each rider operate at the safest level possible.
To make a children's bike safe, the rider needs to be able to brake efficiently and confidently. The custom-sized V-Brakes we have used are calibrated for age, ability and ergonomic fit. And they are made of non-flexing, strong and light alloy. Our light weight alloy rims ensure pedalling is easier. But more importantly alloy rims are a more efficient braking surface than cheaper, chrome-plated steel rims, and are therefore safer.
Little Details Count
True cartridge bottom bracket for straighter chain alignment.
Shimano internal gears forleast resistance, ease of change and durability.
CRM forks for extra comfort and improved handling.
Long rear stay length for best possible gear shifting
Super tough alloy wheels for reduced maintenance.
Calibrated V-Brakes for progressive braking.
Full grip pedals for added safety.
Machined surface rms for predictable braking.
Custom sized grips.
Specifications
Weight: 10.9kg
Minimum Seat Height: 71cm
Frame: Butted Alloy Frame, Low Gravity Concept Design, CRM Forks
Gears: Shimano 3 speed internal gears
Wheels: Dynamic Advantage Tall Alloy Wheels, Reinforced 36 Hole
Tyres: Low-Profile, Low-Resistance Design with Tough Tubes
Brakes: Alloy Tektro Front & Rear Calibrated V brakes + Rear SRAM Footbrake*
Brake Levers: Alloy Tektro Custom Sized Levers
 Saddle: Adjustable, Comfort Midi+ Deluxe
Handlebars: Custom Width Low Rise V-Bars
Safety Reflectors: Included
Bells: Included
Kickstand: Included
 
Size Chart
 
Bike Model Wheel Size Compares To Age Group Rider Height Min Seat Height
E-200 200mm 12" Bike 2-4 years Small - MidSize 33cm
E-250 250mm 12" Bike 3-5 years 85-102cm 40cm
E-350 350mm 16" Bike 4-6 years 95-117cm 46cm
E-450 450mm 20" Bike 5-8 years 110-132cm 59cm
E-540 540mm 24" Bike 7-11 years 130-160cm 66cm
E-620 620mm 26" Bike 10-14 years 142.5-175cm 71cm


How To Determine Your Size

ByK Bikes are not categorised by the old imperial sizings of the past (like 12", 16", 20", or 24"). They use the metric system to describe their wheel sizes as 200mm, 250mm, 350mm, 450mm, 540mm and 620mm. Please use this chart to determine the bike size best suited to your young rider. 

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