Fly Supernova 18 Inch 2021 BMX Bike

In stock
As low as £539.99

With the addition of the new Trebol Mini Lever, Trebol Mini Stem, and the new fork design with an integrated cone shape design, the 18” Supernova is more dialed than we could have imagined... Read More

With the addition of the new Trebol Mini Lever, Trebol Mini Stem, and the new fork design with an integrated cone shape design, the 18” Supernova is more dialed than we could have imagined!

This bike features a 100% Chromoly frame, fork & bars, fully sealed hubs, Trebol Bueno 152mm cranks, Ruben 135mm grips, and Fuego 18” tires. This bike is scaled down to ride just like our 20” bikes.

The Supernova is designed for the little shredders out there that need a bike that can hold up to a higher level of riding but are not quite ready for a full-size bike

Note: Due to production delays specs may change without notice.

BRAKE INCLUDED (no pictured)


  • Frame: Full 4130 Crmo / Removable Brake Mounts
  • Fork: Full 4130 Crmo With Integrated Cone Shape Design
  • Bars: Full 4130 Crmo
  • Grips: Flybikes Ruben / 135mm Long
  • Stem: Trebol Mini Top Load / 40mm Reach/ Forged / 6061 T-6 Aluminum
  • Headset: Trebol Baja Internal Sealed Bearing
  • Lever: Trebol Mini Right / Die Casting Alloy
  • Brake: Trebol Springhanger / Forged / 6061 T-6 Aluminum
  • Cranks: Trebol 3pc / 4130 Crmo / 152mm Arm Length
  • Bottom Bracket: Spanish / Sealed Bearing
  • Sprocket: Trebol / Cnc Machined / 6061-T6 Aluminum / 25t
  • Pedals: Flybikes Ruben Graphite / Nylon - Fiberglass Compound
  • Chain: 510 Type / 64 Links
  • Rims: Trebol / Double Side Walled / 6061-T6 Aluminum / 36h
  • Front Hub: Trebol Male Axle / Sealed Bearing / 3/8” Mm. / 36h
  • Rear Hub: Trebol Cassette 14mm. Male Axle / Sealed Bearing / 36h / 9t.
  • Tyres: Flybikes Fuego 18" X 2.2 Front & Rear / 60 Tpi / 65 Psi
  • Seat: Flybikes Supernova Tripod / 100% Synthetic Leather / 7 Mm Thickness
  • Post: Trebol Tripod / Forged & Cnc Machined / 6061-T6 Aluminum / 135 Mm
  • Weight: 9.6 Kg. / 21.1 Lb.

Frame Geometry:

  • Top Tube Length 18”
  • Chain Stay Length 11.6”
  • Head Tube Angle 75º
  • Seat Tube Angle 71º
  • Bottom Bracket Height 10.5”
  • Stand Over Height 8”

Fork Geometry

  • Fork offset 25mm

Handlebar Geometry:

  • Bar Rise 8”
  • Bar Width 26”
  • Bar Backsweep 10º
  • Bar Upsweep 2º
  • Colour: Gloss Black
  • Lead Time: 0
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account
New Rider?

Choosing the correct bike for your discipline is extremely important, and sometimes for those new to the sport it can be difficult to know or decide, so we’ve broken down the main differences to help you make a decision. 

Freestyle bikes are designed for the skatepark, the streets or the trails.  They are constructed from strong, hard wearing materials and usually feature Steel or Chromoly frames.  This means that the bike can stand up to a certain amount of impacts and hard landings, but remember no bike is indestructible.  For riders looking to learn tricks and stunts, then a freestyle bike is the correct choice.

Race bikes are designed specifically with the track in mind, they are nimble lightweight machines for putting down quick lap times.  Typically, they are constructed from lightweight materials like aluminium and carbon fibre to keep the weight down and the rider at the front of the pack.  These bikes are strong enough for smooth landings on race and pump tracks but will not take the abuse that a freestyle bike would in concrete skateparks.  If you’re looking to set fast lap times or begin your competitive career on the track, a race bike is the right choice. 


Choosing the correct size BMX bike is very important, bikes that are too large will be cumbersome and hard to manoeuvre and bikes that are too small can feel cramped and hard to keep under control.  

Youth freestyle bikes are sized depending on the diameter of the wheel staring at 12” all the way through to 18”, at a 20” wheel the bike is considered an adult size.  Adult freestyle bikes are sized on top tube length, a 18.5” top tube is extra small for younger teenagers who have just moved up to an adult bike, a 20” top tube is small, 20.5” a medium and anything over a 21” is considered large.

Race bikes feature 20-inch wheels on all models, but the components and frame are sized dependent on age and height.  Youth race bikes start from a Micro size for very young riders and offer a range of sizes through to expert XL.  Pro size and upwards are considered adult bikes and are usually offered up to a Pro XXXL or larger for very tall riders. 

We recommend consulting our height charts from the link below to help you choose your perfect sized bike:




Choosing the right level bike for your riding ability is important.  Components that are not suitable for your level of riding can wear or fail much sooner than expected.  Although BMX bikes can look very similar, under the surface components and materials used can vary greatly. 

All our bikes are cherry picked from the very best BMX specialist brands, and all our bikes are designed specifically for use at the skatepark or on the track. 


For first time riders new to the sport our entry level bikes, priced from £200-£400, are perfect, most of these are made from high tensile steel which means they are still relatively strong, but can be slightly heavier than higher end models.  You might find you’ll want to upgrade to something lighter sooner than you’d think.  If you are planning on using the bike in rain or bad weather, we do strongly advise choosing a model with fully sealed bearings all round. 

If you are already confident on a bike and have some experience in skateparks or performing tricks and jumps then we would recommend choosing a mid-range bike, priced from £400 to £700, with a full Chromoly frame, fork, and bars.  This will be lighter and stronger than an entry level model.

 For an experienced person that is already capable of performing most tricks and has previously owned BMX bikes then a high-end complete bike, or full custom would be suggested to meet the demands of this rider, these bikes are priced from £700 plus. 


Our range of entry level race bikes are perfect for first time racers, usually priced between £200 and £400 most of these are constructed of heavier steel rather than aluminium. These are great to get a feel for the sport but would not be able to keep up in a competitive environment. 

Our mid-range race bikes are the perfect for riders who are beginning their path to competitive racing.  Priced between £400 and £800 these are not quite the high-end steeds you see at national level races, but they all feature lightweight aluminium frames and are designed specifically with the racetrack in mind.

For experienced riders who are already racing confidently at a competitive level we offer a small range of high-end complete bikes.  These are usually priced between £800 and £1500 and feature many aftermarket components like carbon forks, disc brakes and folding tyres.  However, at this level we highly recommend building a full custom bike, usually costing between £1500 and £3000 all components can be chosen specifically with the rider in mind.  For help on building a custom bike give us a call or drop us an email!


One of our most frequently asked questions in freestyle is, which rear hub do I want, a freecoaster or a cassette?  Most experienced riders know their preference, but if you’re new to the sport it can be difficult to know which choice to make. 

The main difference between the two is the way the bike performs when going backwards.  A traditional cassette hub requires the rider to pedal in time with the rotation of the wheel while travelling backwards, while a freecoaster allows the rider to travel backwards while keeping the pedals level in the same position as riding forwards.

Although this may seem like a brilliant feature, it does come at a price!  Freecoaster hubs feature a “Slack” before engagement while pedalling forward.  This means that you can turn the crank a set amount (Usually an adjustable amount) before the drivetrain engages.  This is referred to as the “Slack”, when riding backwards you must keep your feet positioned within the slack, if your pedals rotate too much the drivetrain will engage and your pedals will start to rotate.  The smaller the slack, the harder it is to keep your pedal positioned within it while riding backwards.  This means that certain tricks are harder to perform, especially those that rely on pedal pressure, for example Tire Taps.