Bicycle Archive · Specification report

1999 Specialized Fatboy Hemi MX

Velopedia Archive ID 85750

Overview

Model year	1999
Brand	Specialized
Model	Fatboy Hemi MX
Bicycle type	BMX
Archive ID	85750
Original MSRP	$329.99
Colors	Mirror Blue
Sizes	Pro XL

Frameset

Frame construction	Monocoque
Frame material	4130 chromoly
Fork	Specialized
Fork material	Chromoly, unicrown crown
Rear shock	N/A

Drivetrain

Component group	N/A
Shifters	N/A
Front derailleur	N/A
Rear derailleur	N/A
Crankset	Specialized StrongArm 3-piece chromoly, 44 teeth
Bottom bracket	Specialized chromoly
BB shell width	American
Rear cogs	1-speed, 16 teeth
Chain	KMC, 1/2 x 3/32"
Pedals	Specialized platform, aluminum

Brakes

Brakes	Tektro 912A rear brakes, Tektro 314A rear levers

Cockpit & contact points

Headset	1 1/8" threadless Tange-Seiki Aheadset
Handlebar	Pro Design chromoly
Handlebar extensions	N/A
Stem	Specialized aluminum
Saddle	Specialized Race
Seatpost	Specialized aluminum, 26.0mm diameter

Wheels & tires

Hubs	Specialized alloy
Rims	Alex aluminum, 36-hole
Spokes	Specialized UCP, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	Front: 20 x 2.125" Specialized Spanky Team, Rear: 20 x 1.85" Specialized Spanky Team
Wheel size	20" wheels

Geometry · Legacy reference

Top tube	514.4 mm
Head-tube angle	74°
Seat-tube angle	71°
Chainstay / rear center	393.7 mm
Fork offset / rake	25.4 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 4, 2026.