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1998 Lodestar Obsession

Original specifications: Mountain Mix drivetrain · 26" wheels · legacy reference geometry.

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At a glance

Model year
1998
Category
Mountain
Original MSRP
$849.00
Sizes
XS, S, M, L
Colors
2H Graphite, Red Hot Red
Geometry
Legacy reference
In this record
27 specifications · archived image · original MSRP · geometry
Archive ID
71428
Original buildProlite extruded magnesium · Mountain Mix · 26" wheels

Manufacturer catalog

Published sizes and colors

4 sizes · 2 colors

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

XSSML

Published colors

2H GraphiteRed Hot Red

Frameset

Frame ConstructionTIG-welded
Frame MaterialProlite extruded magnesium
ForkLodestar
Fork MaterialChromoly, unicrown crown

Drivetrain

Component GroupMountain Mix
ShiftersGrip Shift ESP 5.0
Front DerailleurShimano STX top-swing, top-pull/bottom bracket mount
Rear DerailleurGrip Shift ESP 5.0
CranksetSugino Impel 250, 24/34/42 teeth
Bottom BracketSealed cartridge, 113mm spindle
BB Shell Width73mm English
Rear Cogs7-speed, 11 - 28 teeth
ChainSachs PC-51, 1/2 x 3/32"
PedalsWellgo LU-964

Brakes

BrakesTektro 821A linear-pull brakes, Tektro RBP-376A levers

Cockpit & Contact Points

Headset1 1/8" threadless Aheadset SAS
HandlebarJD Comp JD-810
Handlebar ExtensionsLee Chi alloy
StemJD Comp JD-347
SaddleSelle Royal Eclipse
SeatpostJD Comp JD-430, 28.6mm diameter

Wheels & Tires

HubsShimano Alivio
RimsMavic 221, 32-hole
SpokesDT stainless steel, 2.0mm straight gauge
Spoke NipplesBrass nipples
Front Tire26 x 1.90" Impac IS Desert King
Wheel Size26" wheels

Geometry

Legacy reference · 6 measurements

Model-level measurements; the frame size was not recorded. Use these as a historical reference, not for size-specific fit.

All geometry measurementsLegacy reference · 6 measurements
MeasurementLegacy reference
Top tube565 mm
Head-tube angle71°
Seat-tube angle73°
Chainstay / rear center425 mm
Wheelbase1063 mm
Fork offset / rake40 mm

The preserved source contains one model-level geometry set without an identified frame size.

Gearing

Chainring ÷ rear sprocket

Lower ratios provide more mechanical advantage for climbing. Higher ratios turn the rear wheel farther with each crank revolution.

RPM
Theoretical speed from published tire dimensions; see the evidence note below.
Published build42/34/24T · 11–28T · 7-speed
Lowest0.86:1 Highest3.82:1 Total range445%
Estimated speed Lowest gear5.9 mph Highest gear26.4 mph

Estimate uses the published front tire 26×1.9 as a proxy, corroborated by the wheel size. Rear tire size is not published or verified. Approximate circumference; actual rollout varies with tire and pressure. Theoretical, not a maximum achievable speed.

Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
0 of 19 checked Progress stays in this browser for this bike.

This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.

Archived: 1998 Lodestar Obsession · Mountain bike, non-suspension · Published sizes: XS, S, M, L

Archived: Frame: TIG-welded · Fork: Lodestar · Chromoly, unicrown crown

Archived: Group: Mountain Mix · Shifters: Grip Shift ESP 5.0 · Front derailleur: Shimano STX top-swing, top-pull/bottom bracket mount · Rear derailleur: Grip Shift ESP 5.0 · Crankset: Sugino Impel 250, 24/34/42 teeth · Bottom bracket: Sealed cartridge, 113mm spindle · Rear cogs: 7-speed, 11 - 28 teeth · Chain: Sachs PC-51, 1/2 x 3/32"

Archived: Brakes: Tektro 821A linear-pull brakes, Tektro RBP-376A levers

Archived: Wheel size: 26" wheels · Rims: Mavic 221, 32-hole · Hubs: Shimano Alivio · Front tire: 26 x 1.90" Impac IS Desert King

Controls and contact points

Archived: Headset: 1 1/8" threadless Aheadset SAS · Handlebar: JD Comp JD-810 · Stem: JD Comp JD-347 · Seatpost: JD Comp JD-430, 28.6mm diameter · Saddle: Selle Royal Eclipse · Pedals: Wellgo LU-964

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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