Bicycle Archive · Specification report

Bicycle comparison

2001 GT Bump · 1999 GT Bump

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