Bicycle Archive · Specification report

1998 Schwinn Hydramatic by Jay Miron

Velopedia Archive ID 78106

Overview

Model year	1998
Brand	Schwinn
Model	Hydramatic by Jay Miron
Bicycle type	Freestyle/jumping
Archive ID	78106
Original MSRP	$499.95
Colors	Bright yellow, dirty green metallic
Sizes	Boys

Frameset

Frame construction	TIG-welded
Frame material	Chromoly
Fork	Schwinn
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	Schwinn XS 2-piece, 44 teeth
Bottom bracket	Schwinn XS sealed bearing
BB shell width	American
Rear cogs	1-speed, 16 teeth
Chain	1/2 x 3/32"
Pedals	Schwinn XS aluminum

Brakes

Brakes	Dia-Compe 990 brakes, Dia-Compe Tech 77 levers

Cockpit & contact points

Headset	1 1/8" threadless aluminum w/SST Oryg detangler
Handlebar	Schwinn XS Pro 4-piece chromoly
Handlebar extensions	N/A
Stem	Schwinn XS invert
Saddle	Schwinn Rally Stripe
Seatpost	Schwinn XS layback micro-adjust chromoly

Wheels & tires

Hubs	Aluminum, nutted
Rims	Aluminum, 48-hole
Spokes	Stainless steel, 2.0mm straight gauge
Spoke nipples	Brass nipples
Front tire	20 x 1.95" freestyle
Wheel size	20" wheels

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 2, 2026.