Frame Compact and strong, depending on use aluminum (light) or chromoly steel (robust). Short chainstays for manuals and tricks. Suspension Fork Dirt/Pumptrack forks with 80–100mm travel, tuned stiffer than trail forks for takeoffs. Wheels Almost always 26 inch, 20–24 inch for kids. Perfect compromise of agility and stability. Drivetrain Mostly singlespeed, lightweight robust chain (half-link), low maintenance. Brake Hydraulic rear disc brake, hose often adjusted for tricks. Barspin-ready for mechanical setups with rotor.

Aluminum (6061-T6) Light, stiff, direct power transfer. Ideal for Dirt Jump, Pumptrack, and competition bikes. Chromoly Steel (4130 CrMo) Durable, long-lasting, slight damping. Perfect for Street, Park, and heavy landings.

Oil chain regularly Check bolts and stem Inspect brakes and bleed if needed Check bearings for play Adjust tire pressure to riding style

MTB Bikes | kunstform BMX Shop & Mailorder

Q: What is an MTB Dirt / Street / Slopestyle / Pumptrack Bike?

An MTB Dirt/Street/Slopestyle/Pumptrack Bike is a hybrid of BMX and mountain bike. Specifically designed for jumps, tricks, and agile riding in parks or on dirt tracks. Usually singlespeed, compact, and robust for maximum control.

Q: What types of MTB bikes do we offer?

Dirt & Pumptrack: Lightweight aluminum frames for maximum speed and height. Street & Park: Robust steel frames (CrMo) for grinds and hard landings. Slopestyle: Sometimes full-suspension for big jumps and drops.

Q: Which MTB 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 to assemble your MTB

Unboxing: Carefully remove packaging. Front Wheel: Insert, tighten quick release or thru-axle. Handlebars: Mount to stem, tighten bolts in cross pattern. Pedals: Right/left threads, grease, tighten. Check: Air pressure (3–4 Bar for Dirt common) and brake.

MTB Bikes FAQ

What is an MTB Dirt / Street / Slopestyle / Pumptrack Bike?

An MTB Dirt/Street/Slopestyle/Pumptrack Bike is a hybrid of BMX and mountain bike. Specifically designed for jumps, tricks, and agile riding in parks or on dirt tracks. Usually singlespeed, compact, and robust for maximum control.

How is an MTB built?

Frame: Compact and strong, depending on use aluminum (light) or chromoly steel (robust). Short chainstays for manuals and tricks.
Suspension Fork: Dirt/Pumptrack forks with 80–100mm travel, tuned stiffer than trail forks for takeoffs.
Wheels: Almost always 26 inch, 20–24 inch for kids. Perfect compromise of agility and stability.
Drivetrain: Mostly singlespeed, lightweight robust chain (half-link), low maintenance.
Brake: Hydraulic rear disc brake, hose often adjusted for tricks. Barspin-ready for mechanical setups with rotor.

What types of MTB bikes do we offer?

Dirt & Pumptrack: Lightweight aluminum frames for maximum speed and height.
Street & Park: Robust steel frames (CrMo) for grinds and hard landings.
Slopestyle: Sometimes full-suspension for big jumps and drops.

Materials used

Aluminum (6061-T6): Light, stiff, direct power transfer. Ideal for Dirt Jump, Pumptrack, and competition bikes.
Chromoly Steel (4130 CrMo): Durable, long-lasting, slight damping. Perfect for Street, Park, and heavy landings.

Which MTB 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 to assemble your MTB

Unboxing: Carefully remove packaging.
Front Wheel: Insert, tighten quick release or thru-axle.
Handlebars: Mount to stem, tighten bolts in cross pattern.
Pedals: Right/left threads, grease, tighten.
Check: Air pressure (3–4 Bar for Dirt common) and brake.

Maintenance & care

Oil chain regularly
Check bolts and stem
Inspect brakes and bleed if needed
Check bearings for play
Adjust tire pressure to riding style

Common issues & solutions

Clicking in bottom bracket → grease / check bolts
Handlebar wobble → tighten stem
Brake rub → clean rotor or replace pads
Chain skipping → check chainring, sprocket, and tension

What do the specifications mean?

Term	Meaning	Examples / Available
Frame Material	Determines weight, stiffness, durability	Aluminum 6061-T6, Chromoly Steel 4130 CrMo
Wheel Size	Diameter of wheels	26 inch, 24 inch, 20 inch (Kids)
Top Tube (TT)	Length of front frame section	20"–23" depending on model and size
Travel	How deep the fork can compress	80–100 mm (Dirt/Freestyle)
Drivetrain	Mostly singlespeed	1 gear, half-link chain
Brake	Hydraulic rear disc brake	Standard on all models, barspin-ready