Velopedia Bicycle Archive

2003 Sun Bicycles Key West Aluminum

Original specifications: Front: 26", Rear: 20" wheels · 33 lb published weight.

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At a glance

Archive #38648

Model year: 2003
Category: Cruiser
Original MSRP: $350.00
Sizes: 19", womens 17"
Colors: Ball Burnished, Blue/Ball Burnished, Red/Ball Burnished
Weight: 33 lb
In this record: 24 specifications · archived image · original MSRP

Model history 3 other years

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Identification clues

2003 archived details

Published colors: Ball Burnished, Blue/Ball Burnished, Red/Ball Burnished
Frame: 6061 T6 aluminum
Original equipment: N/A

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

Original build6061 T6 aluminum · Front: 26", Rear: 20" wheels

Manufacturer catalog

Published sizes and colors

2 sizes · 3 colors

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

Published sizes

19"womens 17"

Published colors

Ball BurnishedBlue/Ball BurnishedRed/Ball Burnished

Frameset

Frame Construction	TIG-welded
Frame Material	6061 T6 aluminum
Fork Material	Hi-tensile steel, unicrown crown

Drivetrain

Shifters	SRAM MRX
Rear Derailleur	Shimano MR-40
Crankset	1-piece 170mm, 44 teeth
Bottom Bracket	Victor VP-B32
BB Shell Width	American
Rear Cogs	7-speed freewheel, 14 - 34 teeth
Chain	KMC Z410, 1/2 x 3/32"
Pedals	Wellgo LU-990

Brakes

Brakes	Tektro 832A linear pull brakes, Tektro 380A levers

Cockpit & Contact Points

Headset	1" threaded steel
Handlebar	Steel, cruiser
Stem	Aluminum
Saddle	Viscount 2350
Seatpost	Aluminum, suspension, 27.2mm diameter

Wheels & Tires

Hubs	Aluminum
Rims	Aluminum, 36-hole
Spokes	Stainless steel, 14ga. (2.0mm) straight gauge
Spoke Nipples	Brass nipples
Front Tire	26 x 2.125" Kenda K-841
Rear Tire	20 x 2.125" Kenda K-841
Wheel Size	Front: 26", Rear: 20" wheels

Gearing

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

Published build44T · 14–34T · 7-speed

Lowest1.29:1 Highest3.14:1 Total range243%

Speed unavailable: wheel or tire size is missing or unclear.

Add your rear tire size to calculate speed

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

Seatpost · Original

Aluminum

suspension, 27.2mm diameter

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Retailer offers

Cane Creek Thudbuster ST Seatpost Black, 27.2mm

Replacement option

Competitive Cyclist ↗$193.99

Backcountry ↗$193.99

Brake pads · Original

Tektro 832A linear pull brakes

Tektro 380A levers

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Pedals · Original

Wellgo LU-990

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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: Front: 26 x 2.125" Kenda K-841, Rear: 20 x 2.125" Kenda K-841
Drivetrain: 7-speed
Seatpost diameter: 27.2 mm
Bottom bracket / shell: Victor VP-B32 · American

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: · Hi-tensile steel, unicrown crown

Look for dents or shape changes and inspect the edges of welds around the head tube, bottom bracket, seat cluster and suspension mounts for hairline cracks.

Drivetrain

Check drivetrain wear →

Archived: Shifters: SRAM MRX · Rear derailleur: Shimano MR-40 · Crankset: 1-piece 170mm, 44 teeth · Bottom bracket: Victor VP-B32 · Rear cogs: 7-speed freewheel, 14 - 34 teeth · Chain: KMC Z410, 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: Tektro 832A linear pull brakes, Tektro 380A 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: Front: 26", Rear: 20" wheels · Rims: Aluminum, 36-hole · Hubs: Aluminum · Front tire: Front: 26 x 2.125" Kenda K-841, Rear: 20 x 2.125" Kenda K-841

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 steel · Handlebar: Steel, cruiser · Stem: Aluminum · Seatpost: Aluminum, suspension, 27.2mm diameter · Saddle: Viscount 2350 · Pedals: Wellgo LU-990

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 Sun Bicycles Key West Aluminum