Bicycle Archive · Specification report

2004 Eastern Bikes Proton Shovelhead

Velopedia Archive ID 31430

Overview

Model year	2004
Brand	Eastern Bikes
Model	Proton Shovelhead
Bicycle type	Freestyle/jumping
Archive ID	31430
Original MSRP	$289.99
Colors	Black, Gray
Sizes	Expert

Frameset

Frame construction	TIG-welded
Frame material	Chromoly top tube, down tube/hi-tensile steel
Fork	Eastern
Fork material	Chromoly steerer, 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 chromoly 175mm, 39 teeth
Bottom bracket	Loose ball
BB shell width	American
Rear cogs	1-speed
Chain	KMC Z410, 1/2 x 1/8"
Pedals	Wellgo LU-313

Brakes

Brakes	Aluminum U-brake rear brakes, Promax alloy rear levers

Cockpit & contact points

Headset	1 1/8" threadless steel threadless
Handlebar	Steel BMX
Handlebar extensions	N/A
Stem	Aluminum 4 bolt
Saddle	Eastern ID
Seatpost	Steel

Wheels & tires

Hubs	Aluminum, 14mm axle
Rims	Aluminum, 48-hole
Spokes	Stainless steel, 14ga. (2.0mm) straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1.95" Kenda Kovert
Wheel size	20" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 1, 2026.