Bicycle Archive · Specification report

Bicycle comparison

1999 GT Bump · 2001 GT Bump

Specification	1999 GT Bump	2001 GT Bump
Overview
Model year	1999	2001
Brand	GT	GT
Model	Bump	Bump
Bicycle type	Freestyle/jumping	Freestyle/jumping
Archive ID	86541	35481
Original MSRP	$316.99	$409.99
Colors	Atomic Blue, Khaki	Galaxie Silver, Raven Black
Sizes	—	Pro
Frameset
Frame construction	Welded	TIG-welded
Frame material	Chromoly	Chromoly
Fork	GT	GT
Fork material	Chromoly, oversize, unicrown crown	Chromoly, unicrown crown
Rear shock	N/A	N/A
Drivetrain
Component group	N/A	N/A
Shifters	N/A	N/A
Front derailleur	N/A	N/A
Rear derailleur	N/A	N/A
Crankset	GT 1-piece chromoly, 44 teeth	GT 3-piece chromoly, 44 teeth
Bottom bracket	One piece	One piece
Rear cogs	1-speed, 16 teeth	1-speed, 16 teeth
Chain	1/2 x 1/8"	KMC, 1/2 x 1/8"
Pedals	GT aluminum platform	GT aluminum platform
Brakes
Brakes	Dia-Compe 990 rear brakes, Dia-Compe MX-97 rear levers	Tektro FX-10 rear brakes, Tektro 217A rear levers
Cockpit & contact points
Headset	1 1/8" threadless Aheadset SX-1	1 1/8" threadless Tange Seiki STE
Handlebar	GT	GT Freestyle
Handlebar extensions	N/A	Not included
Stem	GT Piston	GT Johnson
Saddle	GT	GT
Seatpost	GT chromoly micro-adjust, 31.8mm diameter	GT aluminum micro-adjust
Wheels & tires
Hubs	GT Mohawk	GT Mohawk
Rims	Weinmann ZAC-X, 48-hole	Alex AL-MX22, 48-hole
Spokes	Steel, 2.0mm straight gauge	14g
Spoke nipples	Brass nipples	Brass nipples
Front tire	20 x 2.125" Powerlite Retro-Tread	20 X 2.10" GT LP-III
Rear tire	20 x 1.75" Powerlite Retro-Tread	—
Wheel size	20" wheels	20" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 13, 2026.