Bicycle Archive · Specification report

1998 Mongoose Supergoose Jr.

Velopedia Archive ID 70122

Overview

Model year	1998
Brand	Mongoose
Model	Supergoose Jr.
Bicycle type	BMX
Archive ID	70122
Original MSRP	$315.00
Colors	Polished
Sizes	Junior

Frameset

Frame construction	TIG-welded
Frame material	7005 aluminum
Fork	Mongoose
Fork material	Chromoly, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	3-piece aluminum, 42 teeth
Bottom bracket	One piece
BB shell width	American
Rear cogs	1-speed, 16 teeth
Chain	KMC, 1/2 x 3/32"
Pedals	Mongoose resin

Brakes

Brakes	Dia-Compe sidepull brakes, Tektro levers

Cockpit & contact points

Headset	1 1/8" threadless steel
Handlebar	Mongoose Jr.
Handlebar extensions	N/A
Stem	Mongoose
Saddle	Mongoose Mini
Seatpost	Pillar, aluminum, 28.6mm diameter

Wheels & tires

Hubs	Mongoose
Rims	Mongoose aluminum, 36-hole
Spokes	Steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1 1/8" Comp III style
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	462.3 mm
Head-tube angle	73.3°
Seat-tube angle	67.3°
Chainstay / rear center	348 mm
Wheelbase	850.9 mm
Fork offset / rake	25.4 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 27, 2026.