Velopedia Bicycle Archive

2004 Marin Portofino

Original specifications: Shimano Sora · 8-speed · mechanical rear derailleur · 700c wheels.

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At a glance

Archive #31264

Model year: 2004
Category: Road
Original MSRP: $799.99
Sizes: S, M, L, XL
Colors: Gloss Metallic Black/Silver
In this record: 25 specifications · archived image · original MSRP

Model history 6 other years

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Identification clues

2004 archived details

Published colors: Gloss Metallic Black/Silver
Frame: Columbus Thron,/carbon fiber
Original equipment: Road Mix

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

Original buildColumbus Thron,/carbon fiber · Road Mix · 700c wheels

Manufacturer catalog

Published sizes and colors

4 sizes · 1 color

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

Published sizes

SMLXL

Published colors

Gloss Metallic Black/Silver

Frameset

Frame Construction	TIG-welded
Frame Material	Columbus Thron,/carbon fiber
Fork Material	Carbon fiber

Drivetrain

Component Group	Road Mix
Shifters	Shimano Sora STI Dual Control
Front Derailleur	Shimano FD-2203
Rear Derailleur	Shimano Sora
Crankset	TruVativ Touro, 30/42/52 teeth
Bottom Bracket	TruVativ cartridge
Rear Cogs	8-speed, 12 - 24 teeth
Chain	Shimano HG-50
Pedals	Alloy, Toe Clip and Strap

Brakes

Brakes	Shimano Sora Dual Pivot brakes, Shimano Sora STI Dual Control levers

Cockpit & Contact Points

Headset	1 1/8" threadless Ritchey Logic
Handlebar	Cinelli Altera
Handlebar Extensions	Not included
Stem	Forged and CNC 4 bolt road
Saddle	Selle Italia XO XP
Seatpost	Comp Alloy Micro Adjust

Wheels & Tires

Hubs	Shimano 2200
Rims	Mavic CXP 22, 32-hole
Spokes	DT stainless steel, 15ga. (1.8mm) straight gauge
Spoke Nipples	Aluminum nipples
Front Tire	700 x 28c Kenda Road
Wheel Size	700c wheels

Gearing

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

Pedal cadence

RPM

Speed units

RPM = pedal turns per minute.

All published sizes52/42/30T · 12–24T · 8-speed

Lowest1.25:1 Highest4.33:1 Total range347%

Estimated speed At 90 RPM Lowest gear8.9 mph Highest gear31.0 mph

Uses front tire 700C×28; 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 HG-50

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Retailer offers

SRAM PC-830 Chain One Color, 8 Speed

Replacement option

Competitive Cyclist ↗$11.00

Front tire · Original

700 x 28c Kenda Road Replacement search: 700cx28 bicycle tire Before ordering: Check rim type and tire clearance.

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Saddle · Original

Selle Italia XO XP

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More parts (5)Fewer parts

Front derailleur · Original

Shimano FD-2203

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Rear derailleur · Original

Shimano Sora

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Shifters · Original

Shimano Sora STI Dual Control

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Headset · Original

1 1/8" threadless Ritchey Logic

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Rims · Original

Mavic CXP 22

32-hole

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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 28c Kenda Road
Drivetrain: 8-speed
Bottom bracket / shell: TruVativ 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: · Carbon fiber

Inspect the frame in bright light, especially the head tube, bottom-bracket area, chainstays and clamped surfaces. Look for cracks, ripples, crushed sections or signs of impact.

Drivetrain

Check drivetrain wear →

Archived: Group: Road Mix · Shifters: Shimano Sora STI Dual Control · Front derailleur: Shimano FD-2203 · Rear derailleur: Shimano Sora · Crankset: TruVativ Touro, 30/42/52 teeth · Bottom bracket: TruVativ cartridge · Rear cogs: 8-speed, 12 - 24 teeth · Chain: Shimano HG-50

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: Shimano Sora Dual Pivot brakes, Shimano Sora STI Dual Control levers

Inspect pads and braking surfaces, check the complete cable or hose path, and confirm both controls feel consistent and return cleanly.

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 700c wheels · Rims: Mavic CXP 22, 32-hole · Hubs: Shimano 2200 · Front tire: 700 x 28c Kenda Road

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 Ritchey Logic · Handlebar: Cinelli Altera · Stem: Forged and CNC 4 bolt road · Seatpost: Comp Alloy Micro Adjust · Saddle: Selle Italia XO XP · Pedals: Alloy, Toe Clip and Strap

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.

2004 Marin Portofino