Bump

Information from: http://www.gtbicycles.com/bikes/bmx/dirt-street/2011-bump.

We're not all built to ride a 20" bike. But we all want the same durability that lets you ride all out. That's where the Bump comes in. Equipped with downgraded tubing and spec'd accordingly, these bikes are re-jiggerd for riders who don't need an overbuilt rig, but want to ride over-the-top like anyone else.

Specifications

Seat Clamp: Alloy Single bolt slim

Seat Post: Pivotal, 25.4 x 200mmL.

Saddle: Pivotal street design, GT cover

Grips: GT Wing shroom design

Headset: 1-1/8" integrated, Campy sized 45x45 degree bearings, alloy top cap

Stem: GT freestyle drop design, machined GT logo

Handlebar: GT Pro size dirt/street Steel, 8" rise

Brake Levers: Tektro, 273A, aluminum, hinged clamp

Rear Brake: Tektro, FX340R, coil spring, melt forged aluminum U-brake

Pedals: GT Dirt/Street platform design, Alloy material, cr-mo alxe

Tires: Front: Kenda K-Rad 2.125" Rear: Kenda KoRolla 2.1"

Nipples: Brass

Spokes: 14G

Rear Hub: GT alloy body, 4 sealed bearing cassette with 9T one piece driver, 14mm hi-carbon axle, 36 hole

Front Hub: GT aluminum body, 3/8" Cr-Mo axle, 32 hole

Rims: Alienation PBR, pinned aluminum, 32F/36R,

Chain: KMC Z510

Cog Set: 9T cassette

Bottom Bracket: Mid size sealed bearings, 8 spline Cr-Mo axle

Crankset Chainwheel: GT tubular Cr-Mo 3pc., 8T spline, 175mm / 25T steel GT design

Fork: GT dirt/street design, Cr-Mo 1-1/8" steer, cr-mo 31.8mm blades, 6mmT. Dropouts