GT THUMPER 2001 VS Dirtmaster BIG BERTHA 1999 specs comparison

GT Thumper

General Infos

Model	Thumper
Manufacturer	GT
Year of production	2001
Current price	Check price Here ==>
Color choice	- Starlight Blue -Martian Green
Sizes	- Pro
Sizes	- Pro

Wheels And Breaking System

Bike front tire	20 X 2.10 (inches) GT LP-III
Bike rear tire	Not Available
Bike wheel size	20 (inches) Wheels
Brakeset type	Tektro 270-AX Rear Levers Tektro FX-20 U Brake Rear Brakes
Hubs for disc brakes	GT Mohawk
Rims manufacturer	48-hole Alex AL-MX22
Spoke nipples type	Brass Nipples
Spoke wheel	14g

Frame and Body Specs

Frame materials	Chromoly
Frame type	TIG-welded
Handlebar construction	GT F.U.B.A.R.
Handlebar extender	Optional
Handlebar stem details	GT Johnson
Headset size	1 1/8 (inches) Threadless Tange Seiki STE

Gearing Specifications

Bicycle chain	1/2 X 1/8 (inches) KMC
Bottom bracket shell width	Not Available
Bottom bracket type	Sealed Cartridge
Crankset parts and sizes	44 Teeth GT 3-piece Chromoly
Gear shift levers	Not Available
Rear gear set	16 Teeth 1-speed

GT Thumper Fork System Data

Derailleur (Front)	Not Available
Derailleur (Rear)	Not Available
Fork material	Unicrown Crown Chromoly
Fork type	GT

Other Specs of GT Thumper

Component group sets	Not Available
Pedals details	GT Aluminum Platform
Rear shock absorber	Not Available
Saddle seat	GT
Seat post extension	GT Aluminum Micro-adjust

Dirtmaster Big Bertha

General Infos

Model	Big Bertha
Manufacturer	Dirtmaster
Year of production	1999
Current price	Check price Here ==>
Color choice	- Chrome-Plated - Red - Yellow -Black
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 Specs

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 Specifications

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
Pedals details	Wellgo LU-313U
Rear shock absorber	Not Available
Saddle seat	Team Products Embroidered
Seat post extension	25.4 (millimeters) Diameter Primo Rod