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.
Velopedia Bicycle Archive
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
Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | Prolite extruded magnesium |
| Fork | Lodestar |
| Fork Material | Chromoly, unicrown crown |
Drivetrain
| Component 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 |
| BB Shell Width | 73mm English |
| Rear Cogs | 7-speed, 11 - 28 teeth |
| Chain | Sachs PC-51, 1/2 x 3/32" |
| Pedals | Wellgo LU-964 |
Brakes
| Brakes | Tektro 821A linear-pull brakes, Tektro RBP-376A levers |
|---|
Cockpit & Contact Points
| Headset | 1 1/8" threadless Aheadset SAS |
|---|---|
| Handlebar | JD Comp JD-810 |
| Handlebar Extensions | Lee Chi alloy |
| Stem | JD Comp JD-347 |
| Saddle | Selle Royal Eclipse |
| Seatpost | JD Comp JD-430, 28.6mm diameter |
Wheels & Tires
| Hubs | Shimano Alivio |
|---|---|
| Rims | Mavic 221, 32-hole |
| Spokes | DT stainless steel, 2.0mm straight gauge |
| Spoke Nipples | Brass nipples |
| Front Tire | 26 x 1.90" Impac IS Desert King |
| Wheel Size | 26" wheels |
Geometry
Model-level measurements; the frame size was not recorded. Use these as a historical reference, not for size-specific fit.
Reference frame view
Select an available measurement to locate it on the frame.
All geometry measurementsLegacy reference · 6 measurements
| Measurement | Legacy reference |
|---|---|
| Top tube | 565 mm |
| Head-tube angle | 71° |
| Seat-tube angle | 73° |
| Chainstay / rear center | 425 mm |
| Wheelbase | 1063 mm |
| Fork offset / rake | 40 mm |
The preserved source contains one model-level geometry set without an identified frame size.
Gearing
Lower ratios provide more mechanical advantage for climbing. Higher ratios turn the rear wheel farther with each crank revolution.
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
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.
Identity and fit
Follow the full used-bike inspection order →Archived: 1998 Lodestar Obsession · Mountain bike, non-suspension · Published sizes: XS, S, M, L
Frame and fork
Inspect the frame and fork →Archived: Frame: TIG-welded · Fork: Lodestar · Chromoly, unicrown crown
Drivetrain
Check drivetrain wear →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"
Brakes
Inspect the brakes →Archived: Brakes: Tektro 821A linear-pull brakes, Tektro RBP-376A levers
Wheels and tires
Check wheels and tires →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
Before and during the test ride
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.



