The DirtMaster Big Bertha is a 34,36 pound a freestyle/bmx bike with a chromoly frame. The frame comes in colors like red, black and green.

It was first released in 1999 and again in 2001 for $569 brand new. The Big Bertha is fully rigid.


The Big Bertha comes with various freestyle bike components, including an Odyssey Bang Radix stem and a threadless, Aheadset, Aheadset-Tank Odyssey Gyro headset.


The Big Bertha is a single-speed and has.


It comes with Kenda K-841 Radix tires (NaN x NaN) and aluminum Alex rims.

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Type Freestyle, BMX
MSRP $570
Year 1999, 2001
Alt. Names BigBertha, Big Bertha