The Fly Bikes Proton FC 20 Inch Bike, in black, showcases a CrMo frame, thick tires, handlebars with grips, and a padded seat against a white background.
The Fly Bikes Proton FC 20 Inch Bike features a red BMX design with a durable CrMo frame, black handlebars, detailed frame accents, and fat tires set against a white background.
Close-up view of the Fly Bikes Proton FC 20 Inch Bike's black wheel, featuring an intricate spoke design, sealed hubs, and axle pegs, set against a dark background.
Close-up of the black bicycle seat with a subtle embossed design, mounted on the sleek Fly Bikes Proton FC 20 Inch BMX bike featuring a sturdy CrMo frame against a dark background.
Close-up of the Fly Bikes Proton FC 20 Inch Bike's wheel, showcasing black spokes with a silver hub and black pegs on the axle. This durable configuration is complemented by its CrMo frame, providing a robust ride.
Close-up of the Fly Bikes Proton FC 20 Inch Bike's black BMX chain and CrMo frame, showcasing a detailed astronaut and space-themed design.
Close-up of the Fly Bikes Proton FC 20 Inch Bike, showcasing its black BMX design with a decorative emblem on the front. The bike features branded "Fiction" tires for added style. Its CrMo frame enhances durability, and the sealed hubs guarantee smooth rides against the dark backdrop.
The Fly Bikes Proton FC 20 Inch Bike showcases a CrMo frame with thick tires and straight handlebars, designed for smooth rides with its sealed hubs, all set against a dark background.
The Fly Bikes Proton FC 20 Inch Bike, with its eye-catching red CrMo frame and black handlebars, is showcased against a dark background, highlighting its sealed hubs for smooth riding.

Highlights

  • Freecoaster hub, sealed bearing
  • Full chromoly frame, fork and bars
  • Fly Fuego 2.30" tyres
  • Pegs and hub guards included

Description

This chromoly beast is ready to rip it up, and with it's Freecoaster loaded stock, you can slap it in reverse and have the time of your life! Fly Fuego tyres provide loads of grip and the stack of Trebol parts has this beast dialled!

Features
  • Freecoaster hub, sealed bearing. Roll backwards without the cranks turning, so fakies, half cabs and reverse lines come easy once you have the feel for it.
  • Full chromoly frame, fork and bars. 4130 CrMo through the frame and front end, a mid range build that performs on the street and on ramps.
  • Fly Fuego 2.30" tyres. 60 TPI casings with plenty of grip on concrete, and they take up to 120 PSI if you like them hard and fast.
  • Pegs and hub guards included. A pair of Trebol HS steel pegs and the guards are in the box, so grinding is sorted from day one.
  • Trebol parts through the build. Top load stem, sealed mid bottom bracket, CNC 25T sprocket and 170mm 3 piece chromoly cranks, 11.9 kg without brakes.

Specifications
  • Size: 20" wheels, 21" top tube
  • Frame: Full 4130 CrMo / removable brake mounts
  • Top tube: 21"
  • Chainstay: 13.2"
  • Head tube angle: 75°
  • Seat tube angle: 71°
  • Standover: 9"
  • Bottom bracket height: 11.75"
  • Fork: Integrated cone shape design / full 4130 CrMo / 1 piece steer tube / 27mm offset
  • Headset: Internal sealed bearing
  • Stem: Trebol top load / forged 6061-T6 aluminium / 50mm
  • Bars: Full 4130 CrMo / 9" rise / 29" wide / 10° backsweep / 2° upsweep
  • Grips: Fly Devon / 160mm long
  • Brakes: Trebol Springhanger / forged 6061-T6 aluminium
  • Brake lever: Generic / forged 6061-T6 aluminium
  • Cranks: Trebol 3 piece / 4130 CrMo / 170mm arm length
  • Bottom bracket: Mid / sealed bearing
  • Sprocket: Trebol / CNC machined / 6061-T6 aluminium / 25T
  • Chain: 510 type / 69 links
  • Pedals: Fly Ruben Graphite / nylon and fibreglass compound
  • Front hub: Trebol male / sealed bearing / 10mm male axle / 36H
  • Rear hub: Freecoaster / sealed bearing / 14mm male axle / 36H / 9T
  • Rims: Trebol / semi double walled / 6061-T6 aluminium / 36H
  • Tyres: Fly Fuego 2.30" front and rear / 60 TPI / 120 PSI
  • Seat: Fly Proton Tripod / 100% synthetic leather / 25mm thickness
  • Seat post: Trebol Tripod / forged and CNC machined / 6061-T6 aluminium / 135mm
  • Pegs: Trebol HS steel, 1 pair
  • Weight: 11.9 kg / 26.2 lb (brakeless)
  • Note: Hub guards included. This is the freecoaster (FC) version.

Assembly information

Your bike ships mostly assembled in the box. Finishing it takes most people 10 to 20 minutes with basic tools, and the video above walks through every step.

  • Fit the handlebars and line them up with the front wheel
  • Fit the front wheel, pedals and seat post
  • Check the brakes and tyre pressure before the first ride

Tools: Allen key set and a 15mm, 17mm or 19mm spanner for the pedals and axle nuts (bikes can vary between these three sizes). A socket is needed if installing pegs.

Rather have it done? Ask us about extra assembly before you order, or any local bike shop can finish the build for a small fee.

Fly Bikes Proton FC 20 Inch Bike

Brand: Fly Bikes SKU:

$847.00 USD

Or 4 payments of $211.75 USD with

Colour - Flat Red

Top Tube Length - 21

Drive Side - Right Hand Drive

20 inch BMX sizing

A 20 inch bike is the standard adult BMX and suits riders from about 147cm up. At this wheel size the top tube is what changes the fit, so pick that by height.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If you land in two bands, riding style breaks the tie: longer for flow, trails and transitions, shorter for technical street and park.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

Top tube is measured from the centre of the seat tube to the centre of the head tube, so it is not the same as the length of the tube you can see.

  • A 20 inch bike is the standard adult BMX and most riders end up there, so do not size a tall child down to a smaller wheel.
  • 22, 24 and 26 inch bikes are adult bikes with a bigger wheel, not bigger frames for taller riders.
  • Size up for stability through trails and transitions. Size down if you want the bike quick and twitchy for spins and grinds.
  • Top tube is fixed, but stem length, fork offset and bar position all shift how roomy the bike feels once you are on it.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

20 inch BMX sizing

A 20 inch bike is the standard adult BMX and suits riders from about 147cm up. At this wheel size the top tube is what changes the fit, so pick that by height.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If you land in two bands, riding style breaks the tie: longer for flow, trails and transitions, shorter for technical street and park.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

Top tube is measured from the centre of the seat tube to the centre of the head tube, so it is not the same as the length of the tube you can see.

  • A 20 inch bike is the standard adult BMX and most riders end up there, so do not size a tall child down to a smaller wheel.
  • 22, 24 and 26 inch bikes are adult bikes with a bigger wheel, not bigger frames for taller riders.
  • Size up for stability through trails and transitions. Size down if you want the bike quick and twitchy for spins and grinds.
  • Top tube is fixed, but stem length, fork offset and bar position all shift how roomy the bike feels once you are on it.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

Fly Bikes Proton FC 20 Inch Bike - Flat Red / 21 / Right Hand Drive

$847.00 USD

Price match request

$12.99 flat-rate shipping Australia-wide

Express from $21.99

Free in-store pickup - Brisbane

Availability

Right Hand DriveLeft Hand Drive
Flat Red
Gloss Black

● In stock at LUXBMX ● With supplier ● Preorder ○ Sold out

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