Radio Saiko 20-inch BMX bike, 19.25-inch TT — a compact setup for a smaller rider:

Key features

• Suggested rider height: Approx. 135–155 cm
• Top tube length (TT / A): 19.25 in
• Wheel size: 20 x 2.35 in
• Cranks: Three-piece 4130 chromoly, 170 mm
• Bar: Height (G): 8.2 in; width (H): 28 in
• Weight: 11.90 kg

The Radio Saiko 20 puts a 19.25-inch top tube and 170 mm three-piece chromoly cranks into a compact 20-inch BMX setup. Its frame combines a 4130 chromoly down tube with 1020 Hi-Ten steel, and the fork uses a chromoly steerer with Hi-Ten legs.

Compare the frame with your riding position

The 20-inch wheel size is separate from the 19.25-inch top tube length, marked TT. The suggested rider height is approximately 135–155 cm. Use that as a guide, then compare the top tube, 13.2-inch chainstays and bar dimensions with your proportions and a bike you already know.

Control points sized for this model

The bars measure 8.2 inches high and 28 inches wide, with 150 mm flangeless Radio AM grips. Salt Tracer tyres measure 20 x 2.35 inches. A 25T Radio Vision sprocket and 9T cassette driver complete the gearing, with a rear brake to manage speed.

The frame is prepared for a gyro. Check the components needed for a compatible installation; preparation for a gyro does not mean one is fitted.

Radio Saiko 20-inch BMX bike, 19.25-inch TT — specifications:

Sizing, weight and other details:

• Suggested rider height: Approx. 135–155 cm
• Wheel size: 20 x 2.35 in
• Weight: 11.90 kg

Frame geometry:

• Top tube length (TT / A): 19.25 in
• Chainstay length (CS / B): 13.2 in
• Head tube angle (HA / C): 75°
• Seat tube angle (SA / D): 71.5°
• Bottom bracket height (BB / E): 11.75 in
• Standover height (SO / F): 8 in

Cranks:

• Cranks: Three-piece 4130 chromoly, 170 mm
• Crank model: Radio Rookie Tubular

Handlebars:

• Bar: Height (G): 8.2 in; width (H): 28 in
• Handlebar material: Radio Saiko 20, 1020 Hi-Ten

Frame:

• Frame material: 4130 chromoly down tube / 1020 Hi-Ten

Brakes and controls:

• Gyro compatibility: Frame prepared for a gyro
• Rear brake: Radio AM aluminium rear brake

Fork:

• Fork: Radio Saiko 20, 4130 chromoly steerer, 1020 Hi-Ten legs, tapered legs

Stem:

• Stem: Aluminium, top load, Salt Pro

Wheels and rims:

• Rims: Radio AM, 20 in, 36H

Tyres:

• Tyres: Salt Tracer, 20 x 2.35 in

Headset:

• Headset: Salt Pro, integrated

Chainring or sprocket:

• Sprocket: Radio Vision, 25T

Front hub:

• Front hub: Radio AM, 10 mm chromoly axle, 36H, loose ball bearings

Rear hub and driver:

• Rear hub: Radio AM cassette, 14 mm chromoly axle, 36H, 9T driver, semi-sealed

Chain:

• Chain: Salt AM WZ1

Brake levers:

• Brake lever: Radio AM

Saddle and seatpost:

• Saddle: Radio Century Slim combo
• Seat clamp: Radio Slim, forged aluminium

Pedals:

• Pedals: Radio Pro, nylon / fibreglass, 9/16 in

Grips and bar ends:

• Grips: Radio AM, flangeless, 150 mm

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

Use the letters in the specification to identify each measurement. TT is top tube length, CS is chainstay length, HA is head tube angle, SA is seat tube angle, BB is bottom bracket height and SO is standover height. On the handlebar drawing, G marks height and H marks width.