Velopedia Bicycle Archive

2003 Marin Kentfield

Original specifications: Shimano Altus · 7-speed · mechanical rear derailleur · 700c wheels · legacy reference geometry.

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At a glance

Archive #39263

Model year: 2003
Category: City & Commuter
Original MSRP: $299.99
Sizes: 13.5", 15.5", 17.5", 19", 20.5", womens 15", womens 17"
Colors: Matte Navy
Geometry: Legacy reference
In this record: 24 specifications · archived image · original MSRP · geometry

Model history 12 other years

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Identification clues

2003 archived details

Published colors: Matte Navy
Frame: Chromoly main triangle/hi-tensile steel rear stays
Original equipment: Hybrid Mix

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

Original buildChromoly main triangle/hi-tensile steel rear stays · Hybrid Mix · 700c wheels

Manufacturer catalog

Published sizes and colors

7 sizes · 1 color

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

Published sizes

13.5"15.5"17.5"19"20.5"womens 15"womens 17"

Published colors

Matte Navy

Frameset

Frame Construction	TIG-welded
Frame Material	Chromoly main triangle/hi-tensile steel rear stays
Fork Material	Chromoly, unicrown crown

Drivetrain

Component Group	Hybrid Mix
Shifters	Shimano Acera
Front Derailleur	Shimano Tourney TY-30
Rear Derailleur	Shimano Altus
Crankset	Shimano Tourney TY-30, 28/38/48 teeth
Bottom Bracket	Sealed cartridge
Rear Cogs	7-speed, 13 - 34 teeth
Chain	Shimano CN-UG50, 1/2 x 3/32"
Pedals	Resin

Brakes

Brakes	Aluminum linear-pull brakes, Shimano Acera levers

Cockpit & Contact Points

Headset	1" threaded sealed mechanism
Handlebar	Aluminum, 2" rise
Handlebar Extensions	Not included
Stem	Aluminum, forged
Saddle	Comfort
Seatpost	Aluminum, suspension

Wheels & Tires

Hubs	Aluminum, Q/R
Rims	Aluminum, 36-hole
Spokes	Stainless steel, 14ga. (2.0mm) straight gauge
Front Tire	700 x 35c City
Wheel Size	700c 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	71°
Seat-tube angle	73°
Chainstay / rear center	439.4 mm
Wheelbase	1057.3 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.

Published build48/38/28T · 13–34T · 7-speed

Lowest0.82:1 Highest3.69:1 Total range448%

Estimated speed At 90 RPM Lowest gear6.0 mph Highest gear26.9 mph

Uses front tire 700C×35; 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 CN-UG50

1/2 x 3/32"

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Front tire · Original

700 x 35c City Replacement search: 700cx35 bicycle tire Before ordering: Check rim type and tire clearance.

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Brake pads · Original

Aluminum linear-pull brakes

Shimano Acera levers

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More parts (4)Fewer parts

Crankset · Original

Shimano Tourney TY-30

28/38/48 teeth

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Front derailleur · Original

Shimano Tourney TY-30

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Rear derailleur · Original

Shimano Altus

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Shifters · Original

Shimano Acera

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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: 700 x 35c City
Drivetrain: 7-speed
Bottom bracket / shell: Sealed cartridge

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: Hybrid Mix · Shifters: Shimano Acera · Front derailleur: Shimano Tourney TY-30 · Rear derailleur: Shimano Altus · Crankset: Shimano Tourney TY-30, 28/38/48 teeth · Bottom bracket: Sealed cartridge · Rear cogs: 7-speed, 13 - 34 teeth · Chain: Shimano CN-UG50, 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, Shimano Acera 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: 700c wheels · Rims: Aluminum, 36-hole · Hubs: Aluminum, Q/R · Front tire: 700 x 35c City

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" threaded sealed mechanism · Handlebar: Aluminum, 2" rise · Stem: Aluminum, forged · Seatpost: Aluminum, suspension · Saddle: Comfort · Pedals: Resin

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 Kentfield