A Fit Bike Co Flow 20 Inch bike in brown with black handlebars, seat, pedals, and tires is displayed side view against a white background.

The Fit Bike Co Flow 20 Inch Bike features a BMX-inspired matte brown frame with black handlebars, seat, and wheels—ideal for riders wanting the signature style of the Flow series. Shown against a white background.

A Fit Bike Co Flow 20 Inch Bike with a chrome frame, black seat, black tires, and yellow handlebar grips is shown on a white background.

A Fit Bike Co Flow 20 Inch BMX bike in green, featuring a tan seat, black handlebars, and black tires, displayed at an angle against a white background.

Highlights

Built for dirt and transitions
Longer 21" or 21.25" top tube
175mm cranks, 30T Saw sprocket
Wide 2.4" FIT OEM tyres

Description

The FIT Flow 20" is a full send machine for riders who live for high speed lines, deep bowls and dusty berms. Replacing the TRL series, it is FIT's answer to modern dirt and transition riding, whether you are carving concrete or boosting through the woods.

A longer top tube of 21" or 21.25" and a trail specific 74.5° head angle keep it stable at speed but responsive in the air. The 175mm tubular chromoly cranks and 30T sprocket deliver extra power for bigger jumps, wide 2.4" FIT OEM tyres grip loose dirt and slick bowls, and chainstay mounted brakes keep things clean. Up top are 8.7" rise bars, a FIT Pivotal seat and long Tech flanged grips.

Features

Built for dirt and transitions. The Flow replaces the TRL series as FIT's answer to modern trail riding, from deep bowls to dusty berms.
Longer 21" or 21.25" top tube. Trail specific geometry with a 74.5° head angle: stable at speed, still responsive once you are in the air.
175mm cranks, 30T Saw sprocket. Tubular chromoly cranks and a bigger sprocket give you extra power for the run in to bigger jumps.
Wide 2.4" FIT OEM tyres. Grip on everything from loose dirt to slick bowls, backed by a full chromoly fork with tapered legs and 33mm offset.
Cockpit set up for control. 8.7" x 29" bars on a FIT top load stem with long Tech flanged grips, because control matters when you are going fast and sideways.

Specifications

Size: 20" wheels, 21" or 21.25" top tube
Frame: Cro-Mo front triangle, trail geometry
Top tube: 21" or 21.25"
Head tube angle: 74.5°
Fork: 100% Cro-Mo, tapered legs, 33mm offset, welded insert
Headset: Integrated with gyro holes
Stem: FIT top load
Bars: 2 piece, 8.7" x 29"
Grips: Long Tech flanged
Brakes: Chainstay mounted
Cranks: Tubular Cro-Mo, 175mm
Bottom bracket: Sealed mid
Sprocket: FIT Saw 30T
Pedals: FIT Trail alloy
Tyres: FIT OEM 2.4"
Seat: FIT Pivotal
Seat post: 200mm

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.

Fit Bike Co Flow 20 Inch Bike

Name: Fit Bike Co Flow 20 Inch Bike
Brand: Fit Bike Co
SKU: FTBK119-26-GRN
Price: 1099.99 AUD
Availability: InStock

Brand: Fit Bike Co SKU: Click to copy the SKU and show the pick location

$1,099.99 AUD

Or 4 payments of $274.99 AUD with

Colour - Matte Green

Top Tube Length - 21

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 height	Wheel size	Top tube
60 to 91cm	12"	12 to 12.5"
81 to 106cm	14"	14 to 14.5"
96 to 122cm	16"	16 to 16.5"
122 to 147cm	18"	18 to 18.5"
147 to 157cm	20"	19.75 to 20.25"
157 to 168cm	20"	20 to 20.5"
168 to 175cm	20"	20.25 to 20.75"
175 to 183cm	20"	20.5 to 21"
183 to 190cm and up	20"	20.75 to 21.5"
160cm and up	22"	21 to 22.25"
160cm and up	24"	21.75 to 22"
160cm and up	26"	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