Velopedia Bicycle Archive

2003 Marin Muirwoods

Original specifications: Shimano Deore · 8-speed · mechanical rear derailleur · 26" wheels · legacy reference geometry.

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At a glance

Archive #39258

Model year: 2003
Category: City & Commuter
Original MSRP: $399.99
Sizes: 13", 15", 17", 18.5", 20"
Colors: Matte Charcoal
Geometry: Legacy reference
In this record: 24 specifications · archived image · original MSRP · geometry

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Identification clues

2003 archived details

Published colors: Matte Charcoal
Frame: Chromoly, double-butted
Original equipment: Mountain Mix

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

Original buildChromoly, double-butted · Mountain Mix · 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

13"15"17"18.5"20"

Published colors

Matte Charcoal

Frameset

Frame Construction	TIG-welded
Frame Material	Chromoly, double-butted
Fork Material	Chromoly, unicrown crown

Drivetrain

Component Group	Mountain Mix
Shifters	Shimano Alivio RapidFire Plus
Front Derailleur	Shimano Alivio
Rear Derailleur	Shimano Deore SGS
Crankset	TruVativ X-Forge, 22/32/42 teeth
Bottom Bracket	Shimano BB-UN25
Rear Cogs	8-speed, 11 - 28 teeth
Chain	Shimano IG-31, 1/2 x 3/32"
Pedals	Resin body, aluminum cage

Brakes

Brakes	Aluminum linear-pull brakes, aluminum linear-pull levers

Cockpit & Contact Points

Headset	1 1/8" threadless WTB Momentum Comp ST
Handlebar	Aluminum, rise
Handlebar Extensions	Not included
Stem	Aluminum, forged
Saddle	WTB Speed V
Seatpost	Aluminum micro-adjust

Wheels & Tires

Hubs	Aluminum, Q/R
Rims	Alex TA-19, 32-hole
Spokes	DT stainless steel, 15ga. (1.8mm) straight gauge
Front Tire	26 x 1.50" WTB Slickosaurus
Wheel Size	26" wheels

Geometry

Legacy reference · 5 measurements

Historical measurements. Frame size unknown.

All geometry measurementsLegacy reference · 5 measurements

Measurement	Legacy reference
Top tube	552.4 mm
Head-tube angle	70°
Seat-tube angle	73°
Chainstay / rear center	425.4 mm
Wheelbase	1057.4 mm

Frame size not recorded.

Gearing

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

Pedal cadence

RPM

Speed units

RPM = pedal turns per minute.

All published sizes42/32/22T · 11–28T · 8-speed

Lowest0.79:1 Highest3.82:1 Total range486%

Estimated speed At 90 RPM Lowest gear5.3 mph Highest gear25.6 mph

Uses front tire 26×1.5; 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.

Try other gearing

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

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

Gears Drivetrain

Front teeth Smallest rear teeth Largest rear teeth

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

Rear tire

Rear tire marking

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).

Rim diameter (BSD, mm) Tire width (mm)

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.

Cadence (RPM) Speed units

Gear, dimension and cadence changes update results automatically.

Gearing comparison
Measure	Original	Your setup
Lowest ratio	—	—
Highest ratio	—	—
Total range	—	—
Lowest-gear speed	—	—
Highest-gear speed	—	—

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

Parts & serviceability

Find replacement parts

Original specifications

Chain · Original

Shimano IG-31

1/2 x 3/32"

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Retailer offers

SRAM PC-830 Chain One Color, 8 Speed

Replacement option

Competitive Cyclist ↗$11.00

Front tire · Original

26 x 1.50" WTB Slickosaurus

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Brake pads · Original

Aluminum linear-pull brakes

aluminum linear-pull levers

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More parts (6)Fewer parts

Bottom bracket · Original

Shimano BB-UN25

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Front derailleur · Original

Shimano Alivio

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Rear derailleur · Original

Shimano Deore SGS

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Shifters · Original

Shimano Alivio RapidFire Plus

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Headset · Original

1 1/8" threadless WTB Momentum Comp ST

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Rims · Original

Alex TA-19

32-hole

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Parts and service referenceQuick reference before buying parts

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

Front tire: 26 x 1.50" WTB Slickosaurus
Drivetrain: 8-speed
Bottom bracket / shell: Shimano BB-UN25

Equipment inspection checks 9 checks based on 5 archived component groups Open equipment checksClose equipment checks

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 →

Frame and fork

Inspect the frame and fork →

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

Check paint damage, vent holes and accessible internal surfaces for corrosion. Look for dents, bent tubes and cracking around welded or brazed joints.

Drivetrain

Check drivetrain wear →

Archived: Group: Mountain Mix · Shifters: Shimano Alivio RapidFire Plus · Front derailleur: Shimano Alivio · Rear derailleur: Shimano Deore SGS · Crankset: TruVativ X-Forge, 22/32/42 teeth · Bottom bracket: Shimano BB-UN25 · Rear cogs: 8-speed, 11 - 28 teeth · Chain: Shimano IG-31, 1/2 x 3/32"

Shift through every available gear under light load. Hesitation, skipping or inconsistent indexing can reflect wear, damage, poor adjustment or mismatched replacement parts.
Measure chain wear with a compatible gauge and inspect chainring, cassette or freewheel teeth. A new chain does not rule out wear in the remaining drivetrain.
Turn the cranks slowly, feel for rough bearings and check for side-to-side play. Inspect crank arms, chainring bolts and pedal threads for looseness or damage.

Brakes

Inspect the brakes →

Archived: Brakes: Aluminum linear-pull brakes, aluminum linear-pull levers

Inspect pads, cables and housings, then examine both rim braking surfaces for concavity, cracking or heavy wear. Confirm each caliper returns and centers correctly.

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 26" wheels · Rims: Alex TA-19, 32-hole · Hubs: Aluminum, Q/R · Front tire: 26 x 1.50" WTB Slickosaurus

Spin both wheels and watch for side-to-side and vertical movement. Check spoke tension, rim condition and hub play.
Inspect both tire casings for cuts, cracking, plugs, bulges or exposed threads and confirm the installed sizes are safe for the rims and available frame and fork clearance.

Controls and contact points

Archived: Headset: 1 1/8" threadless WTB Momentum Comp ST · Handlebar: Aluminum, rise · Stem: Aluminum, forged · Seatpost: Aluminum micro-adjust · Saddle: WTB Speed V · Pedals: Resin body, aluminum cage

Apply the front brake and rock the bike to check for headset play or notchiness. Inspect the stem, handlebar and clamp zones, then confirm every fastener and control is secure.
Check that the seatpost moves for adjustment and that the saddle, post and clamp hold securely without cracks, severe corrosion or damaged hardware.

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

2003 Marin Muirwoods