Bicycle Archive · Specification report

Bicycle comparison

2006 GT Bump · 2007 GT Bump

Specification	2006 GT Bump	2007 GT Bump
Overview
Model year	2006	2007
Brand	GT	GT
Model	Bump	Bump
Bicycle type	BMX	Freestyle/jumping
Archive ID	11306	16100
Original MSRP	$269.99	$269.99
Colors	RootBeer Brown, Pink	Matte Navy Blue, Matte Brick
Sizes	20" wheel	20" wheel
Frameset
Frame construction	TIG-welded	TIG-welded
Frame material	3-tube chromoly	Chromoly
Fork	'05 GT dirt jump design	'05 GT dirt jump
Fork material	Chromoly	Chromoly, unicrown crown
Rear shock	N/A	N/A
Drivetrain
Component group	BMX	BMX Mix
Shifters	N/A	N/A
Front derailleur	N/A	N/A
Rear derailleur	N/A	N/A
Crankset	GT Tubular Cr-Mo 3pc, 36 teeth	GT Tubular Cr-Mo 3pc.
Bottom bracket	Steel, ball type	Ball type with 8 spline Cr-Mo axle
Rear cogs	1-speed, 13 teeth	1-speed, 12 teeth
Chain	KMC Z410	KMC Z410
Pedals	'05 GT Dirt/Street platform design, aluminum body, cr-mo alxe	'05 GT Dirt/Street platform design, aluminum body, cr-mo alxe
Brakes
Brakes	Alloy side-pull caliper front/Tektro, 907AD, dual anchor bolts, forged aluminum U-brake rear brakes, Tektro, 274A, aluminum levers	Tektro, FX-330 rear brakes, Tektro 274A levers
Cockpit & contact points
Headset	1 1/8" Tange Seiki FATTY 22, extra deep cup engagement	1 1/8" threadless Tange Seiki FATTY 22
Handlebar	GT dirt/street bend, Cr-mo, 7" rise	GT dirt/street Cr-mo
Handlebar extensions	N/A	Not included
Stem	GT Johnson III design, cold forged aluminum	GT FS design
Saddle	GT "Star 19" two piece design, 9mm rails	Velo mini street
Seatpost	Aluminum double bolt micro adjust	Alloy Micro adjust
Wheels & tires
Hubs	Front: '05 GT branded, aluminum body, sealed Mech. bearings, 3/8" Cr-Mo axle, 36 h, Rear: '05 GT branded, aluminum body, sealed Mech. bearins, 14mm Cr-Mo axle, 36 ho	Front: GT aluminum sealed, Rear: GT sealed cassette
Rims	Alex G22, aluminum, 36 hole, 30mm width, 36-hole	Alex G22, 36-hole
Spokes	14ga. (2.0mm) Straight Gauge	14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples	Brass nipples
Front tire	26 x 2.20" GT-1453	Front: 26 x 2.125" Front: Kenda K-Rad, Rear: 26 x 2.10" Kenda Konxsion
Rear tire	26 X 2.10" GT LP-IV	—
Wheel size	26" wheels	26" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 10, 2026.