SIBMX Düvel 18-inch children’s BMX bike — a smaller BMX with an Odyssey G3 gyro:

Key features

• Wheel size: 18 in
• Top tube length (TT): 18.5 in
• Suggested rider height: Approx. 135–149 cm
• Level: Beginner
• Gyro: Odyssey G3
• Cranks: One-piece chromoly, 140 mm
• Drivetrain: 30T / 13T cassette
• Rear brake: Odyssey Springfield U-brake
• Weight: Approx. 11.90 kg

An 18-inch BMX for a smaller rider

The Düvel gives younger riders an 18-inch wheel setup with an 18.5-inch top tube. Its 140 mm cranks have a smaller pedalling circle than adult-length cranks, making this a size to compare when a full-size 20-inch BMX feels too big.

The suggested height range is around 135–149 cm. Check your child’s reach, frame clearance and ability to operate the brake lever, rather than relying on height alone. The bar is 25.5 inches wide with a 7.65-inch rise.

Turn the bars without winding up the rear brake cable

The Odyssey G3 gyro allows the bars to turn through 360 degrees without twisting up the rear brake cable. You can keep the rear brake while working on tricks that involve bar rotation. Have the gyro and brake adjusted correctly before riding; the fitted gyro does not remove the need to check the cables and brake operation.

A simple drivetrain for practising

A 30T sprocket drives the 13T cassette hub, so there are no gear changes to operate. The cassette allows coasting forwards and requires back-pedalling when rolling backwards. The rear hub has semi-sealed bearings; the front hub uses ball bearings.

The frame and fork are 1020 hi-ten steel, with single-wall P-7X aluminium rims and Sunday Current 18 x 2.2-inch tyres. A Junior lever operates the rear Odyssey Springfield U-brake. An adult should help check the fit, choose suitable protective equipment and select riding areas appropriate to the rider’s ability.

SIBMX Düvel 18-inch children’s BMX bike — specifications:

Sizing, weight and other details:

• Wheel size: 18 in
• Suggested rider height: Approx. 135–149 cm
• Level: Beginner
• Weight: Approx. 11.90 kg

Frame geometry:

• Top tube length (TT): 18.5 in
• Chainstay length (CS): 11.7–12 in
• Head tube angle (HA): 74.5°
• Seat tube angle (SA): 71°

Brakes and controls:

• Gyro: Odyssey G3
• Rear brake: Odyssey Springfield U-brake

Cranks:

• Cranks: One-piece chromoly, 140 mm

Drivetrain:

• Drivetrain: 30T / 13T cassette

Frame:

• Frame: SIBMX Düvel 18, 1020 hi-ten steel, Low Park geometry

Fork:

• Fork: 1020 hi-ten steel, two-piece construction

Handlebars:

• Bar: 1020 hi-ten steel; 25.5 in width, 7.65 in rise, 12° backsweep, 1° upsweep

Stem:

• Stem: Sunday Freeze, aluminium, front load

Headset:

• Headset: Integrated, cartridge bearings

Wheels and rims:

• Rims: P-7X, aluminium, 18 in, 28H, single wall

Tyres:

• Tyres: Sunday Current, 18 x 2.2 in

Bottom bracket:

• Bottom bracket: US BB

Chainring or sprocket:

• Sprocket: 30T

Front hub:

• Front hub: Low flange, 10 mm / 3/8 in chromoly axle, 28H, ball bearings

Rear hub and driver:

• Rear hub: Cassette, 14 mm chromoly axle, 13T driver, 28H, semi-sealed bearings

Chain:

• Chain: KMC S1

Brake levers:

• Brake lever: Junior

Saddle and seatpost:

• Saddle and seatpost: One-piece combo

Pedals:

• Pedals: Wellgo PC

Grips and bar ends:

• Grips: Ribbed grips

Safety while riding

Freestyle BMX riding puts high loads through the bike during tricks, jumps and landings. No bike is indestructible: parts can wear out or become damaged. Check the frame, fork, bars, wheels, axles, cranks, pedals, brakes and bolted connections before every ride. Inspect the bike after a hard impact and stop riding if you find looseness, cracks or damage. Have any problem checked and repaired before riding again.

Wear a properly fitted helmet and suitable protective pads. Read our important information before buying and riding a BMX bike for assembly, servicing and riding checks.

Important information about your new bike

• Read the instructions and warranty supplied with the bike before riding.
• The bike is delivered approximately 90% assembled for shipping.
• Before the first ride, fit the pedals, saddle and handlebars, and the front wheel where required. Follow the assembly instructions and check all components.
• Have a professional bike workshop carry out a pre-ride inspection. This is a paid service; keep the receipt as proof for the manufacturer’s warranty and follow the warranty terms supplied with your bike.

The manufacturer’s warranty is separate from your statutory consumer rights. Continue to inspect and service the bike throughout its use.

Frame geometry diagram