Dirtmaster Big Bertha 1999 Technical specs and features
| Brand | Dirtmaster |
| Model | Big Bertha |
| First production | 1999 |
| Bike category | Freestyle |
| Bike sub-category | Freestyle And Jumping |
| Bike Pricing | Check price Here ==> |
| Parts And Accessories | Dirtmaster Big Bertha Parts |
| Available Sizes | - Pro XL |
Wheels And Breaking System
| Bike front tire | 20 X 2.25 (inches) Kenda K-841 |
| Bike rear tire | Not Available |
| Bike wheel size | 20 (inches) Wheels |
| Brakeset type | Dia-Compe Tech 99 Levers Dia-Compe 990 Brakes |
| Hubs for disc brakes | Joy Tech Jy A085SBT |
| Rims manufacturer | 48-hole Alex Supra |
| Spoke nipples type | Brass Nipples |
| Spoke wheel | 2.0 (millimeters) Straight Gauge Da-Sen Stainless Steel |
Frame and Body Specifications
| Frame materials | 4130 chromoly c |
| Frame type | TIG-welded |
| Handlebar construction | Dirtmaster Hoochie |
| Handlebar extender | Not Available |
| Handlebar stem details | Odyssey Bang |
| Headset size | 1 1/8 (inches) Threadless Aheadset SE-1 F and S With Odyssey Gyro Detangler |
Gearing Specs
| Bicycle chain | 1/2 X 1/8 (inches) KMC 410H |
| Bottom bracket shell width | American 24tpi |
| Bottom bracket type | YST BB 621 |
| Crankset parts and sizes | 44 Teeth 1-piece Chromoly 180 (millimeters) |
| Gear shift levers | Not Available |
| Rear gear set | 16 Teeth 1-speed |
Dirtmaster Big Bertha Fork System Data
| Derailleur (Front) | Not Available |
| Derailleur (Rear) | Not Available |
| Fork material | Unicrown Crown 4130 Chromoly |
| Fork type | Dirtmaster Street Fork |
Other Specs of Dirtmaster Big Bertha
| Component group sets | Not Available |
| Available colors | - Black - Chrome-Plated - Red - Yellow |
| Weight | 34.0 |
| Pedals details | Wellgo LU-313U |
| Rear shock absorber | Not Available |
| Saddle seat | Team Products Embroidered |
| Seat post extension | 25.4 (millimeters) Diameter Primo Rod |
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Dirtmaster Big Bertha bike review
Dirtmaster produced the Big Bertha bike in 1999 and can be classified as a Freestyle bicycle, this exact model costs in american market arround $569.99.
Dirtmaster Freestyle Big Bertha can be found in a few colors, among these colors Black, Chrome-Plated, Red and Yellow .
This bike is equiped with 20 x 2.25" Kenda K-841 tires and Da-Sen stainless steel spoke wheel while the rims are manufactured by Alex Supra, 48-hole. Dirtmaster equiped this exact model with Dia-Compe 990 brakes, Dia-Compe Tech 99 levers braking system and Joy Tech Jy A085SBT hubs.
To guarantee the comfiest ride Dirtmaster used 4130 chromoly material for the frame. Dirtmaster Hoochie high strength material is used on the handlebar of this Big Bertha to ensure the perfect handling while the stems are made of Odyssey Bang.
For the smoothest biking experience 1-piece chromoly 180mm, 44 teeth is used on this bicycle linked to KMC 410H chain that is easily replaceable as stated by Dirtmaster.