Velopedia Bicycle Archive

1998 Rocky Mountain Thin Air

Original specifications: Grip Shift ESP 9.0SL/Shimano Deore XT drivetrain · 26" wheels · 24.4 lb published weight.

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At a glance

Archive #78477
Model year
1998
Category
Mountain
Original MSRP
$1,939.00
Sizes
16", 17.5", 18.5", 19.5", 21"
Colors
Red
Weight
24.4 lb
Geometry
Legacy reference
In this record
25 specifications · archived image · original MSRP · geometry
Model history 5 other years

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Identification clues

1998 archived details

Published colors
Red
Frame
Easton Custom HBO aluminum
Original equipment
Grip Shift ESP 9.0SL/Shimano Deore XT

Clues, not proof of model year. Colors vary and components may have been replaced.

Campaign
Original buildEaston Custom HBO aluminum · Grip Shift ESP 9.0SL/Shimano Deore XT · 26" wheels

Manufacturer catalog

Published sizes and colors

5 sizes · 1 color

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

Published sizes

16"17.5"18.5"19.5"21"

Published colors

Red

Frameset

Frame ConstructionWelded
Frame MaterialEaston Custom HBO aluminum
ForkMarzocchi Bomber Z-2
Fork MaterialAluminum, triple-clamp crown

Drivetrain

Component GroupGrip Shift ESP 9.0SL/Shimano Deore XT
ShiftersGrip Shift ESP 9.0SL
Front DerailleurShimano Deore XT top-swing, top-pull/clamp-on 31.8mm
Rear DerailleurGrip Shift ESP 9.0SL
CranksetRace Face Turbine LP, 22/32/44 teeth
Bottom BracketShimano BB-UN72
Rear Cogs8-speed, 11 - 30 teeth
ChainTaya TB-700, 1/2 x 3/32"
PedalsRitchey Expert

Brakes

BrakesShimano Deore XT V-Brake brakes, Grip Shift ESP 9.0 levers

Cockpit & Contact Points

Headset1 1/8" threadless Ritchey Fuzzy Logic
HandlebarSyncros
Handlebar ExtensionsNot included
StemSyncros
SaddleSelle Italia Future Race
SeatpostSyncros

Wheels & Tires

HubsShimano Deore XT
RimsSun Rims CR17A
SpokesDT stainless steel, 2.0mm double-butted
Front Tire26 x 1.95" WTB VelociRaptor 44/50 kevlar
Wheel Size26" wheels

Geometry

Legacy reference · 4 measurements

Historical measurements. Frame size unknown.

All geometry measurementsLegacy reference · 4 measurements
MeasurementLegacy reference
Top tube585 mm
Head-tube angle71°
Seat-tube angle73.5°
Fork offset / rake40.6 mm

Frame size not recorded.

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

RPM

RPM = pedal turns per minute.

All published sizes44/32/22T · 11–30T · 8-speed
Lowest0.73:1 Highest4.00:1 Total range545%
Estimated speed At 90 RPM Lowest gear5.1 mph Highest gear27.8 mph

Uses front tire 26×1.95; rear size isn’t listed.

How it works

Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.

Speeds are estimates from tire size and pedal cadence. Actual speeds vary.

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Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Your gearing setup
Gears

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Gear, dimension and cadence changes update results automatically.

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

Find replacement parts

Original specifications
Front tire · Original
26 x 1.95" WTB VelociRaptor 44/50 kevlar
Brake pads · Original
Shimano Deore XT V-Brake brakes

Grip Shift ESP 9.0 levers

Bottom bracket · Original
Shimano BB-UN72
More parts (5)Fewer parts
Pedals · Original
Ritchey Expert
Saddle · Original
Selle Italia Future Race
Crankset · Original
Race Face Turbine LP

22/32/44 teeth

Headset · Original
1 1/8" threadless Ritchey Fuzzy Logic
Hubs · Original
Shimano Deore XT

Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.

Parts and service referenceQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire
26 x 1.95" WTB VelociRaptor 44/50 kevlar
Drivetrain
8-speed
Bottom bracket / shell
Shimano BB-UN72
Campaign
Equipment inspection checks 11 checks based on 6 archived component groups Open equipment checksClose equipment checks
0 of 11 checked Progress stays in this browser for this record.

Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.

Full used-bike inspection guide →

Archived: Frame: Welded · Fork: Marzocchi Bomber Z-2 · Aluminum, triple-clamp crown

Archived: Fork: Marzocchi Bomber Z-2

Archived: Group: Grip Shift ESP 9.0SL/Shimano Deore XT · Shifters: Grip Shift ESP 9.0SL · Front derailleur: Shimano Deore XT top-swing, top-pull/clamp-on 31.8mm · Rear derailleur: Grip Shift ESP 9.0SL · Crankset: Race Face Turbine LP, 22/32/44 teeth · Bottom bracket: Shimano BB-UN72 · Rear cogs: 8-speed, 11 - 30 teeth · Chain: Taya TB-700, 1/2 x 3/32"

Archived: Brakes: Shimano Deore XT V-Brake brakes, Grip Shift ESP 9.0 levers

Archived: Wheel size: 26" wheels · Rims: Sun Rims CR17A · Hubs: Shimano Deore XT · Front tire: 26 x 1.95" WTB VelociRaptor 44/50 kevlar

Controls and contact points

Archived: Headset: 1 1/8" threadless Ritchey Fuzzy Logic · Handlebar: Syncros · Stem: Syncros · Seatpost: Syncros · Saddle: Selle Italia Future Race · Pedals: Ritchey Expert

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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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