2019 Polygon Relic 20 inch Kids Mountain Bike

Special Pre-Order Price


This Deal ends in:

days hrs mins

Pre order stock now available. Dispatch date is 31st January 2019 from our Sydney warehouse. Limited stock.

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Bike colours as shown in the images above!

Featuring a trail bike inspired Alutech hardtail frame with Zoom suspension fork, Shimano 6sp. group and light 20" alloy wheels, the Relic 20 will put the youngest dirt riders on the fast track to big fun.

Whilst department stores will offer kids bikes of this size, do not confuse the difference in quality. An example of this is the rear derailleur hanger, on these Polygon bikes, they are made from a separate piece of Aluminium and in the event of a crash, are designed to bend and break if necessary. These hangers save the frame from being destroyed - on cheaper bikes the hanger is part of the frame, and often made from steel. When these break, the rear gear mechanism cannot be repaired and the entire bike has to be thrown away. Don't make the mistake of buying cheap, these bikes are backed by a full warranty and designed by bicycle professionals.  

It features a 6 speed Shimano Tourney gear system, Zoom Bravo front suspension, front and rear mechanical disc brakes and a comfort sports saddle. 



  • Shimano Tourney componentry throughout. 
  • 20" Double Wall Alloy wheels 
  • Shimano 6sp. group with Mechanical Disc brakes
  • Zoom suspension fork, making it a perfect bike for getting into mountain biking
  • 6061 ALUTECH Aluminium frame is light, strong and durable 
  • Performance, 20”X2.00” tyres
  • LIFETIME Warranty on Frame.
  • Full manufacturer’s warranty on parts.
  • Colour: Blue
  • Weight: 13kg





Relic 20


Hardtail XC MTB 6SP Front Disc






Al6 Aluminium frame


Zoom Suspension Fork - 40mm






External caged bearing








Plastic Body Pedal


BB CH63-2


KMC Z-33


Shimano Tourney


Shimano Tourney RD-TY21


Shimano Tourney SL-RS35


Alloy Lever


Mechanical disc brake


Mechanical Disc brake


Performance 20”X2.00”


Double Wall Alloy




Alloy 36H


Alloy 36H

We understand how important shipping is once you click "buy now", that's why we have the following policies

Australian Warehouse

All products are in stock and ready to ship from our Sydney warehouse (with the exception of preordered bikes, which have the dispatch date illustrated)

Next day dispatch

All orders received by 5 pm AEST will usually be dispatched the following business day. If an order is placed on the weekend or public holiday, please note dispatch will usually be the next working day. For tracked shipments, please allow 12 hours for tracking to begin.

Shipping of Parts, Accessories and Apparel

Economy Shipping

There is free delivery available on all small parcels Australia wide using tracked services of Australia Post or Fastway, no minimum order value required! Estimated delivery time is 4-9 business days. 

Express Shipping

We do also offer Express Shipping for a small additional fee on parts, accessories and apparel orders. Estimated delivery time on Express Shipping is 1 to 4 business days.

Shipping of Bikes

Shipping of bikes and other bulky goods is free to 85% of residences in Australia. However, some postcodes incur a surcharge starting from $29. 

Once shipped you will be issued a consignment number which can be used to track your parcel. We use Direct Freight Express for deliveries and you can track your delivery by calling 1300 347 397 or online at www.directfreight.com.au


We’re so confident that you’ll love our extensive range of bikes, that we’ll let you ride one as your own for a full 14 days and if you don’t like it, simply e-mail us at sales@bicyclesonline.com.au and we’ll pick it up from you, free of charge! Just make sure you keep the box so it can be re-used to send it back. Click here for more information. 

All of our bicycles come with a Free Pro Build valued at $99. This means that your bicycle will be pre built by our professional mechanics. For your convenience, safety and comfort all our bikes are fully assembled prior to delivery. The bike is then packaged back into a box for secure shipment.


When your bike arrives, all you have to attach is the front wheel, the handlebar and pedals, everything else has been done – the headset has been adjusted, wheels trued, pedals and seat post greased, brakes and gears calibrated, and the tyres have been pumped up (please note upon arrival, in some cases you may need to add more air to tyres).

Most companies simply sell you the bike as it comes from the factory, which will require significant know-how to get your bike on the road. Currently we are the only Australian company providing this service, and have the 14 day test ride to back it up.

Whilst your new bicycle will have already gone through our Pro Build process, you will still need to complete some minor final assembly steps when you take your bicycle out of its box.

Please follow the video playlist below to correctly complete the setup of your new bike:


Assembly Time:

  • 10-15min - You have assembled bikes before
  • 15-25min - You are mechanically handy
  • 30-40min - Never assembled a bike and working with tools isn't your thing


Unboxing your bike:

Start by carefully opening the top flap to expose the contents. You will see the bike with plenty of protective packaging and next to the rear wheel, the saddle & seatpost, a small cardboard box where your pedals, tools, bell and reflectors are. If you ordered any other products with the bike, it is likely they were placed on the bottom of the box as well. Remove all the loose items before pulling the bike out of the box and gently placing it on the floor.

Keep the box and all the protective packaging found on the bike in case you choose to change frame sizes, upgrade/downgrade the bike, or return the bike for a full refund under the 14 Day Test Ride Policy.

How to Install a Nutted Hub front wheel:


V Brake Setup:


How to Install Handlebars and faceplate:


How to install pedals on your bike:


Congratulations on your Purchase

This bicycle is backed by a LIFETIME factory warranty on frame and full manufacturer’s warranty on parts. Lifetime warranty refers to the lifetime of the original owner.

Warranty is valid only for bicycle that has been properly and well-maintained under the following conditions:

Warranty includes:

  • All damaged or fractured or broken frame / fork / component which was caused by manufacturing or assembling error in factory.
  • Non functioning mechanism caused by manufacturing error in factory.

Warranty is NOT valid for:

  • Incorrect assembly, i.e pedals installed in the wrong crank arm. 
  • Normal degradation caused by frequent use, such as degrading brake shoe, deflated tire, etc
  • Surface defects, such as stained, marred, defaced, etc
  • Damaged caused by misuse or accident
  • Other damages which are not caused by factory error
  • Bicycle which has been sold to other party
  • Bicycle used in commercial, such as rented
  • Bicycle which has not been well-maintained

For any damages which is guaranteed by the brand as the first condition above, the brand will repair or replace damaged frame / fork / component with the one of the same brand or similar.

Warranty is valid for all Polygon and Marin bicycles to the original owner only, by showing the purchase invoice.  

To make a claim click here.

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