MTB Bikes

Q: What is an MTB Dirt Jump Bike?

A Dirt Jump Mountain Bike (Dirt Bike for short) is a hybrid of a BMX and a mountain bike. It is specifically designed for jumps, tricks, and pump tracks. Unlike a classic trail MTB, it typically lacks gears (singlespeed) and unnecessary weight. The geometry is compact, with a steep sloping top tube to give you maximum clearance for tricks like can-cans or tailwhips.

Q: How is a Dirt Bike constructed?

Frame Compact and strong with short chainstays for easy manuals. Usually a hardtail (front suspension only). Suspension Fork Specific dirt forks (e.g., from Manitou or RockShox) with 80mm to 100mm travel. They are tuned stiffer than trail forks to prevent energy loss during takeoffs. Wheels Almost always 26 inches. They offer the perfect compromise between stability and roll-over capability. Drivetrain Mostly Singlespeed (one gear) with a robust chain (often half-link), similar to BMX. This saves weight and is low maintenance. Brake Usually just a hydraulic disc brake in the rear. For barspins, the hose is often extra long or routed through the steerer tube (with mechanical brakes via a gyro).

Q: What materials are used?

Aluminum (6061-T6) Lightweight and very stiff. The top choice for race, pump track, and competition bikes (e.g., Radio Griffin). Power transfer is extremely direct. Chromoly Steel (4130 CrMo) The classic from the BMX world. Slightly heavier, but extremely durable and offers some natural damping. Popular with street riders (e.g., Radio Asura).

Q: Which MTB Dirt Bike is right for me?

Your Style Recommendation Model Example Street & Park Steel (CrMo), robust, agile Radio Asura (26 inch) Dirt Jump & Contest Aluminum, light, stiff, suspension fork Radio Griffin Pro (26 inch) Kids & Groms Smaller wheels, adapted geometry Radio Zuma (20 or 24 inch)

Q: How do I assemble my new Dirt Bike?

Unboxing: Carefully remove the packaging material. Front Wheel: Insert the front wheel into the fork (tighten quick release or thru-axle). Handlebars: Mount the handlebars to the stem and tighten the bolts evenly in a cross pattern. Pedals: Note the right and left threads! Grease the threads and screw them in tightly. Check: Check the air pressure (3.0 - 4.0 Bar is common for dirt) and the brake.

MTB Bikes FAQ

What is an MTB Dirt Jump Bike?

A Dirt Jump Mountain Bike (Dirt Bike for short) is a hybrid of a BMX and a mountain bike. It is specifically designed for jumps, tricks, and pump tracks. Unlike a classic trail MTB, it typically lacks gears (singlespeed) and unnecessary weight. The geometry is compact, with a steep sloping top tube to give you maximum clearance for tricks like can-cans or tailwhips.

How is a Dirt Bike constructed?

Frame: Compact and strong with short chainstays for easy manuals. Usually a hardtail (front suspension only).
Suspension Fork: Specific dirt forks (e.g., from Manitou or RockShox) with 80mm to 100mm travel. They are tuned stiffer than trail forks to prevent energy loss during takeoffs.
Wheels: Almost always 26 inches. They offer the perfect compromise between stability and roll-over capability.
Drivetrain: Mostly Singlespeed (one gear) with a robust chain (often half-link), similar to BMX. This saves weight and is low maintenance.
Brake: Usually just a hydraulic disc brake in the rear. For barspins, the hose is often extra long or routed through the steerer tube (with mechanical brakes via a gyro).

What types are there?

The main distinction is made based on the intended use and frame material:

Dirt & Pump Track: Lightweight aluminum frames for maximum speed and height.
Street & Park: Robust steel frames (CrMo) that can handle grinds and rough flat landings.
Slopestyle: Sometimes full-suspension frames (Fullies) for extremely large jumps and drops.

What materials are used?

Aluminum (6061-T6): Lightweight and very stiff. The top choice for race, pump track, and competition bikes (e.g., Radio Griffin). Power transfer is extremely direct.
Chromoly Steel (4130 CrMo): The classic from the BMX world. Slightly heavier, but extremely durable and offers some natural damping. Popular with street riders (e.g., Radio Asura).

Which MTB Dirt Bike is right for me?

Your Style	Recommendation	Model Example
Street & Park	Steel (CrMo), robust, agile	Radio Asura (26 inch)
Dirt Jump & Contest	Aluminum, light, stiff, suspension fork	Radio Griffin Pro (26 inch)
Kids & Groms	Smaller wheels, adapted geometry	Radio Zuma (20 or 24 inch)

How do I assemble my new Dirt Bike?

Unboxing: Carefully remove the packaging material.
Front Wheel: Insert the front wheel into the fork (tighten quick release or thru-axle).
Handlebars: Mount the handlebars to the stem and tighten the bolts evenly in a cross pattern.
Pedals: Note the right and left threads! Grease the threads and screw them in tightly.
Check: Check the air pressure (3.0 - 4.0 Bar is common for dirt) and the brake.

What do the specifications mean?

Term	Explanation	Examples / Available
Wheel Size	Diameter of the rims. 26 inch is the standard.	26 inch, 24 inch, 20 inch (Kids)
Top Tube (TT)	Length of the front frame section. Determines the ""feel"" of space.	22.5 inch (L), 23 inch (XL)
Travel	How deep the fork can compress.	80mm, 100mm (Standard)
Dropouts	Mount for the rear wheel. Usually horizontal for chain tension.	10x135mm, 12mm Thru-Axle