Bicycle Archive · Specification report

2003 Eastern Bikes Proton Chromosome

Velopedia Archive ID 30264

Overview

Model year	2003
Brand	Eastern Bikes
Model	Proton Chromosome
Bicycle type	Freestyle/jumping
Archive ID	30264
Original MSRP	$279.99
Colors	Black
Sizes	Pro

Frameset

Frame construction	TIG-welded
Frame material	Hi-tensile steel
Fork material	Chromoly, oversize, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	1-piece chromoly 175mm, 39 teeth
Bottom bracket	One piece
BB shell width	American
Rear cogs	1-speed, 14 teeth
Chain	KMC Z410, 1/2 x 1/8"
Pedals	Wellgo LU-313

Brakes

Brakes	Aluminum U-brake brakes, FS-328 levers

Cockpit & contact points

Headset	1 1/8" threadless steel threadless
Handlebar	2 piece
Handlebar extensions	Not included
Stem	Aluminum 4 bolt
Saddle	Eastern 9mm rails
Seatpost	Steel

Wheels & tires

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