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How Bike Delivery Works

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Delivered ready to ride in 4 to 10 days

How Bike Delivery Works
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Place your order

Select the product you are interested in, Select delivery and type in your postcode, Select Bike Delivery, if this is not available there is no available stock nearby

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Order Confirmation

Once your order is placed we will be in contact with you within 2 hours, to confirm your order.

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Bike Build

Your bike will be built up at your local 99 bikes by one of our expert mechanics and safety checked prior to delivery.

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Your bike is delivered to your door by a 99 Bikes expert who will walk you through your new bike and answer any questions you may have.

Radius Toughrunner 20 Kids Mountain Bike Red/Black/Silver (2020)

Out of stock
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Up to 12 months interest free

or 4 interest-free payments of  $80.00
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Perfect Ride Guarantee

Perfect Ride Guarantee
If you don't love it, you can swap it, up to 30 days from purchase!* Learn more »

Free Bike Build

Free Bike Build
We'll build your bike for free when you click and collect at any 99 Bikes store.

First Free Service

First Free Tune-up
Every bike come with a complimentary free tune-up and safety check.

Please note, due to challenges in the product supply chain, bike specifications are subject to change without notice. Specifications listed below may not match exactly as shown in the photo.

The Radius Toughrunner is a 20 inch boys mountain bike with snappy handling and a sporty look that is sure to deliver hours of fun. The Throttle is built with a 20" Youth boys hi-tensile steel frame which is tough and Radius Youth MTB geometry, ideal for the growing boy that like to push the limits. The low stand over height makes for easy mounting and confident riding, while the super comfortable Youth specific saddle and grips are super comfy. This bike is really easy for kids to ride and is built to be durable and efficient.

The 20" knobby tyres are versatile and can handle the pavement and gravel paths. While the Shimano 6 speed shifters offer hassle free shifting and low maintenance. The alloy v-brakes are another key feature, giving you braking performance and control all the speed that is rolling through the durable and light alloy rims. The Radius Throttle Boys Mountain Bike is a great bike for the developing rider and is a very comfortable and enjoyable bike for the boy that just wants to get out and explore the streets or the trails.


  • 20" Youth boys hi-tensile steel frame, with Radius Youth MTB geometry.
  • Low stand over height for easy mounting and confident riding.
  • 35mm travel suspension fork, for ultimate riding comfort when getting off the path.
  • 20" knobby tyres, great for light trails and gravel paths.
  • Hassle free Shimano 6 speed shifting.
  • Super comfortable Youth specific saddle and grips, for ultimate riding comfort.
  • Alloy v-brakes, with alloy rims provide excellent braking performance.
  • Full alloy youth specific short reach brake lever, for easy brake operation.

For more information on kids bikes and sizing see our Kids Bikes Buying Guide.

More Information
SKU AP20615
Size 20inch - G
Click & Collect Yes
Wheel Size 20"
Frame Material Steel
Cassette Type 6 Speed
Chainset Type Single
Brake Type V-Brake
Bottom Bracket Nutted 5pcs BB, Square Taper Axle
Brake Levers Alloy Lever, Resin Clamp
Cassette Shimano 6 speed
Chain KMC 6 Speed
Crankset 3-pcs, 36T
Derailleur Front n/a
Derailleur Rear Shimano RD-TY18
Fork 20" Suspension
Frame Hi-Ten steel
Grips Kraton Grip
Handlebar Lightweight Riser Bar
Headset 1" Steel, Caged bearing
Hubs Front Nutted Axle, Rear Nutted Axle
Pedals High Impact Resin
Rims Alloy Youth Rim
Saddle Radius Youth Comfort
Seatpost Steel L:250mm
Stem Quilled Stem
Spokes UCP
Shifters Shimano SL-RS35, 6 speed
Tyres Wanda 20" x 1.95"
Speeds ## x ##
Kids Bike Sizing 20 Inch

Radius Kids Bike Sizing Chart

Rider's Height (cm)
12" Wheel
16" Wheel
20" Wheel
24" Wheel
26" Wheel

This is an accurate estimate, and every new bike comes with a free professional bike fit when you click & collect in store, plus all bikes have a 30 day Perfect Ride Guarantee.


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How Same Day Delivery Works?

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Delivered before 8:30pm same day

How Same Day Delivery Works
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Place your order

All Orders placed before 3pm will be booked for same day shipping. Orders placed after 3pm will be delivered next day.

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Order Confirmation

Once your order is placed we will be in contact with you within 2 hours, to confirm your order.

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Pick up and Tracking

Our trusted courier partner will pick up your order and send you tracking information.

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Your order will be delivered before 8:30 pm on the same day the order was placed.