Sunday Forecaster Maca Grasset 20 Inch Bike (2023) / Matte Midnight Purple / 20.5TT
A Sunday Forecaster Maca Grasset 20 Inch Bike in purple with black tires and a gyro setup is parked on a paved street beside modern office buildings and trees.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike in black with blue "Forecaster" graphics and "Sunday" branding near the seat post—an ideal BMX bike for your next park session, set against a concrete background.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike’s purple frame, black handlebars, headset with visible brake cables, park bike gyro setup, and “FSA” logo.
Close-up of a bicycle's rear wheel showing a Springfield brake caliper, tire tread, chain, and part of the purple Sunday Forecaster Maca Grasset 20 Inch Bike frame.
A Sunday Forecaster Maca Grasset 20 Inch Bike, black with thick tires and blue decals, is parked on an empty asphalt lot near a gray garage door.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike's wheel hub, spokes, and fork with "Sunday" logo—ideal for riders building a park BMX or planning a gyro setup.
Front view of the Sunday Forecaster Maca Grasset 20 Inch Bike showing handlebars, gyro setup brake lever, front tire, and pedals on a paved surface.
A Sunday Forecaster Maca Grasset 20 Inch Bike in purple with a gyro system, plus black handlebars, seat, and tires, is parked on asphalt.
Close-up of the drivetrain and rear wheel of the purple Sunday Forecaster Maca Grasset 20 Inch Bike, showing "Sunday" branding on the frame and a gyro setup, photographed outdoors on pavement.
Close-up of a black bicycle seat with the "Sunday Bikes" logo and signature embossed, mounted on a purple Sunday Forecaster Maca Grasset 20 Inch Bike frame.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike's BMX headset and brake assembly, showing the FSA logo, gyro setup, brake cables, and bolts on its black park frame.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike frame showing "FORECASTER" and "SUNDAY," plus the rear wheel, chain, and gyro—ideal for any BMX park rider.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike's handlebar and stem, showing the "SUNDAY" branding on the stem and headset cap—a perfect detail shot for park BMX enthusiasts.
Close-up of the black handlebar stem with "SUNDAY" engraved on the front plate and visible bolts, shown on the Sunday Forecaster Maca Grasset 20 Inch Bike—perfect for BMX riders seeking precision in park or gyro setups.
Close-up of the Sunday Forecaster Maca Grasset 20 Inch Bike's matte purple frame featuring a black and white "100% made in FRANCE" sticker.
Close-up of a black handlebar grip embossed with "SUNDAY," mounted on a Sunday Forecaster Maca Grasset 20 Inch Bike outdoors.
Front view of the Sunday Forecaster Maca Grasset 20 Inch Bike in black, highlighting the handlebars, brake lever, gyro cables, seat, and frame on a paved surface.
Close-up of a black handlebar with brake lever and cables, showing part of the frame, pedal, and pavement—features typical of a park BMX bike like the Sunday Forecaster Maca Grasset 20 Inch Bike, possibly with a gyro setup.
Close-up of a Sunday Forecaster Maca Grasset 20 Inch Bike crankset, featuring the chainring labeled "Sunday," along with the chain and part of the rear tire.
Close-up of the black brake lever and handlebar with adjustment dial and cable on the Sunday Forecaster Maca Grasset 20 Inch Bike, highlighting its park BMX gyro setup against a blurred background.
The Sunday Forecaster Maca Grasset 20 Inch Bike, shown in side profile on a white background, features thick tires, a compact frame, high handlebars, and a single gear—perfect for park riding.

Description

If you are in the market for a park orientated bike that is built tough and has a brand name like Sunday backing it then look no further. This bike is dialled! Included on this epic bike is a gyro setup so you can whip and barspin with cable freedom!

Maca's Forecaster uses a park specific geometry and an Odyssey Gyro that is connected to a pro-level Odyssey M2 Trigger lever and pre-cut dual lower cables for better braking and easier maintenance.

Maca’s bike is also loaded with other Odyssey components like the Springfield brake, Twisted Pro pedals, and Path Pro tyres. Sunday Lightning rims and sealed front and rear hubs will keep riders rolling smooth and blasting their local park.
A great transition inspired bike.

Features
  • Odyssey Gyro G3 detangler. The cables spin with the bars, so you can barspin and whip without the brake cable winding up.
  • Park specific geometry. A 20.5" top tube with 12.7-13" chainstays and 7.5" standover keeps the bike quick and easy to throw around transitions.
  • Odyssey M2 Trigger lever. A pro-level lever with pre-cut dual lower cables for better braking and easier maintenance.
  • Sealed hubs front and rear. A sealed Sunday rear hub with a 9T driver on Odyssey Stage 1 rims keeps you rolling smoothly around your local park.
  • 100% chromoly frame. Full chromoly with removable brake hardware, Odyssey Twisted PC Pro pedals and 2.4" Path Pro OEM tyres, 12.14 kg all up.

Specifications
  • Size: 20.5" top tube
  • Frame: Sunday Forecaster, 20.5" TT, 100% chromoly with integrated 1-1/8" head tube and removable brake hardware
  • Top tube: 20.5"
  • Chainstay: 12.7-13"
  • Head tube angle: 75.5°
  • Seat tube angle: 71°
  • Standover: 7.5"
  • Bottom bracket height: 11.625"
  • Fork: Sunday Forecaster, 20", 2-piece chromoly steerer tube with welded pre-load
  • Headset: FSA integrated conical, 1-1/8"
  • Stem: Sunday Freeze front load, 48mm
  • Bars: Sunday, 2-piece, 9" rise, 28.5" width, 12° backsweep, 4° upsweep
  • Grips: Sunday Cornerstone
  • Brakes: Odyssey Springfield U-brake, Odyssey Gyro G3 detangler, Odyssey M2 upper and two single lower cables
  • Brake lever: Odyssey M2 Trigger
  • Cranks: 160mm, 3-piece, chromoly
  • Bottom bracket: Sealed, mid, 19mm
  • Sprocket: Sunday Sabertooth v2, 25T, steel
  • Chain: KMC Z1 wide
  • Pedals: Odyssey Twisted PC Pro
  • Front hub: Sunday, 36H, low-flange, sealed, 3/8" female axle
  • Rear hub: Sunday, 36H, sealed, 14mm male axle with 9T driver
  • Spokes: 14g steel, black
  • Rims: Odyssey Stage 1, 20", 36H
  • Tyres: Odyssey Path Pro OEM, 20 x 2.4" (front and rear)
  • Seat: Odyssey Badge, Pivotal
  • Seat post: Sunday Pivotal
  • Seat clamp: Sunday
  • Weight: 12.14 kg (with brakes)
  • Note: Alloy cap: Sunday M16, aluminium

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.

Sunday Forecaster Maca Grasset 20 Inch Bike

Brand: Sunday SKU:

$1,099.99 AUD

Or 4 payments of $274.99 AUD with

Recommended Rider Height:

168-183cm

Colour - Matte Midnight Purple

Top Tube Length - 20.5

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
$1,099.99 AUD

Price match request

Sunday Forecaster Maca Grasset 20 Inch Bike - Matte Midnight Purple / 20.5

Metro bike shipping from $59.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

Availability

20.5
Matte Midnight Purple
Black

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

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