Velopedia Bicycle Archive

1999 DirtMaster Big Bertha

Freestyle/jumping bicycle from the Velopedia specification archive.

Original MSRP
$569.99
Sizes
Pro XL
Colors
Black, Chrome-Plated, Red, Yellow
Weight
34
Archive ID
83493
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Frameset

Frame ConstructionTIG-welded
Frame Material4130 chromoly
ForkDirtmaster Street Fork
Fork Material4130 chromoly, unicrown crown
Rear ShockN/A

Drivetrain

Component GroupN/A
ShiftersN/A
Front DerailleurN/A
Rear DerailleurN/A
Crankset1-piece chromoly 180mm, 44 teeth
Bottom BracketYST BB 621
BB Shell WidthAmerican 24tpi
Rear Cogs1-speed, 16 teeth
ChainKMC 410H, 1/2 x 1/8"
PedalsWellgo LU-313U

Brakes

BrakesDia-Compe 990 brakes, Dia-Compe Tech 99 levers

Cockpit & Contact Points

Headset1 1/8" threadless Aheadset SE-1 F/S w/Odyssey Gyro detangler
HandlebarDirtmaster Hoochie
Handlebar ExtensionsN/A
StemOdyssey Bang
SaddleTeam Products embroidered
SeatpostPrimo Rod, 25.4mm diameter

Wheels & Tires

HubsJoy Tech Jy A085SBT
RimsAlex Supra, 48-hole
SpokesDa-Sen stainless steel, 2.0mm straight gauge
Spoke NipplesBrass nipples
Front Tire20 x 2.25" Kenda K-841
Wheel Size20" wheels

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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