Bicycle Archive · Specification report

1998 SE Racing Assassin X20

Velopedia Archive ID 77371

Overview

Model year	1998
Brand	SE Racing
Model	Assassin X20
Bicycle type	BMX
Archive ID	77371
Original MSRP	$389.00
Colors	Frosty grey, polished, yellow
Sizes	Pro XL
Weight	23.5 lb

Frameset

Frame construction	TIG-welded
Frame material	7005 aluminum
Fork	SE Racing Landing Gear
Fork material	4130 chromoly, 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 180mm, 44 teeth
Bottom bracket	YST BB 621 AW
BB shell width	68mm Threadless
Rear cogs	1-speed, 16 teeth
Chain	KMC 408CP, 1/2 x 3/32"
Pedals	Wellgo LU-313

Brakes

Brakes	Chang Star VB-885AS brakes, Chang Star VC-287DT levers

Cockpit & contact points

Headset	1 1/8" threadless Tioga
Handlebar	SE Racing Crowbar
Handlebar extensions	N/A
Stem	Wei Hau MX-241
Saddle	Velo VL-283
Seatpost	Kalloy SP-4130 micro-adjust, 26.8mm diameter

Wheels & tires

Hubs	Formula OV 31
Rims	Alex VP-20F, 36-hole
Spokes	Ta Sen stainless steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	Front: 20 x 2.125" Kenda K-50 Comp III type, Rear: 20 x 1.75" Kenda K-50 Comp III type
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	533.4 mm
Head-tube angle	75°
Seat-tube angle	72°
Chainstay / rear center	387.3 mm
Wheelbase	965.2 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 27, 2026.