Fly Bikes Sion 20 Inch Bike / Gloss Dark Red
Fly Bikes Sion 20 Inch Bike / Gloss Black

Description

The Sion is Fly's all round blasting machine, built for riding control and aimed squarely at technical street and modern park. It runs a full 4130 chromoly frame, fork and bars, with removable brake mounts and chain tensioners.

This version has been upgraded with the Tractor Guard sprocket, the Savanna seat, four pegs with hub guards and Fuego tyres. Sealed hubs front and rear, a sealed mid bottom bracket and 175mm Trebol chromoly cranks finish the build.

Features
  • Built for control, street and park. A 21" top tube on a 13.4" rear end with a 75° head angle: settled enough for tech street, sharp enough for modern park.
  • Fly Tractor Guard 28T sprocket. The guard takes the ledge hits so the CNC machined sprocket teeth survive, and the 28T gearing gives you a bit more speed.
  • Four pegs and hub guards. Grind either side from the first session, with the guards already fitted to protect the hub flanges and axles.
  • 175mm chromoly cranks. Long Trebol 3 piece arms on a sealed mid bottom bracket give plenty of leverage pumping out of transitions.
  • Chain tensioners and removable mounts. Tensioners stop the rear wheel creeping under hard pedalling, and the brake mounts come off if you ride without a rear brake.

Specifications
  • Size: 20" wheels, 21" top tube
  • Frame: Full 4130 CrMo / removable brake mounts / chain tensioners
  • Top tube: 21"
  • Chainstay: 13.4"
  • Head tube angle: 75°
  • Seat tube angle: 71°
  • Standover: 9.25"
  • Bottom bracket height: 11.75"
  • Fork: Full 4130 CrMo / 1 piece steer tube / integrated cone shape design / 27mm offset
  • Headset: Trebol / sealed bearing / CNC machined / 6061-T6 aluminium
  • Stem: Fly Volcano FL / 6mm rise / 50mm reach / 6061-T6 aluminium CNC machined
  • Bars: Full 4130 CrMo / 9.25" rise / 29" wide / 10° backsweep / 2° upsweep
  • Grips: Fly / 160mm long
  • Brakes: Trebol Springhanger / forged 6061-T6 aluminium
  • Brake lever: Generic / forged 6061-T6 aluminium
  • Cranks: Trebol 3 piece / 4130 CrMo / 175mm arm length
  • Bottom bracket: Mid / sealed bearing
  • Sprocket: Fly Tractor Guard / CNC machined / 6061 aluminium / 28T
  • Chain: 512 type / 70 links
  • Pedals: Fly Ruben Graphite / nylon and fibreglass compound
  • Front hub: Trebol / sealed bearing / 10mm female axle / 36H
  • Rear hub: Trebol / sealed bearing / 14mm male axle / 36H / 9T
  • Rims: Fly Piramide / double wall / 6061-T6 aluminium
  • Tyres: Fly Fuego 2.30 front and rear / 60 TPI / 110 PSI
  • Seat: Fly Savanna
  • Pegs: 4 pegs included
  • Note: Hub guards included.

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 Sion 20 Inch Bike

Brand: Fly Bikes SKU:

$1,269.99 AUD

Or 4 payments of $317.49 AUD with

Colour - Gloss Dark Red

Top Tube Length - 21

Drive Side - Left 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
$1,269.99 AUD

Price match request

Fly Bikes Sion 20 Inch Bike - Gloss Dark Red / 21 / Left Hand Drive

$12.99 flat-rate shipping Australia-wide

Express from $21.99

Free in-store pickup - Brisbane

Availability

Right Hand DriveLeft Hand Drive
Gloss Dark Red
Gloss Black

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

Need Help ?

Chat with the LUXBMX crew!

Email Us Call Us SMS Us
  • 100% Australian owned
  • Australia's largest BMX range
  • Hassle-free returns
  • Fast trackable shipping