Velopedia Bicycle Archive
2025 Marin San Quentin 3 Frame Kit
Mountain bicycle from the Velopedia specification archive.
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What Velopedia knows
- Model year
- 2025
- Category
- Mountain
- Original MSRP
- $629.00
- Sizes
- S, M, L, XL
- Colors
- Purple Fade
- Geometry
- 4 manufacturer sizes · Geometry context
- Record coverage
- 4 preserved details · archived image · original MSRP · preserved geometry
- Archive ID
- 900000514
Frameset
| Frame Construction | Series 3 6061 Aluminum, Double Butted, Internal Cable Routing, 12x148mm Thru-Axle, 73mm Threaded BB |
|---|---|
| Frame Material | Aluminum |
Drivetrain
| BB Shell Width | 73 mm |
|---|
Wheels & Tires
| Wheel Size | 27.5; 29 |
|---|
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 310 mm | 340 mm | 410 mm | 420 mm |
| Effective top tube | 565.9 mm | 594.9 mm | 620.77 mm | 651.81 mm |
| Head tube | 110 mm | 115 mm | 125 mm | 130 mm |
| Head-tube angle | 64° | 64° | 64° | 64° |
| Seat-tube angle | 77° | 77° | 77° | 77° |
| Chainstay / rear center | 425 mm | 425 mm | 430 mm | 430 mm |
| Wheelbase | 1176 mm | 1206.2 mm | 1232 mm | 1264.57 mm |
| Bottom-bracket drop | 50 mm | 50 mm | 50 mm | 50 mm |
| Bottom-bracket height | 316 mm | 316 mm | 327 mm | 327 mm |
| Reach | 422 mm | 450 mm | 470 mm | 500 mm |
| Stack | 623.4 mm | 627.9 mm | 653.05 mm | 657.54 mm |
| Standover height | 628.1 mm | 657 mm | 688 mm | 695 mm |
| Fork offset / rake | 47 mm | 47 mm | 47 mm | 47 mm |
| Crank length | 170 mm | 170 mm | 170 mm | 170 mm |
| Stem length | 45 mm | 45 mm | 45 mm | 45 mm |
| Handlebar width | 780 mm | 780 mm | 780 mm | 780 mm |
Geometry source: Manufacturer HTML geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
S geometry
Archive context: The chainstay of 425 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 50 mm sits toward the deeper-drop end. Its stack of 623.4 mm sits somewhat taller than typical.
Compared with 180 distinct mountain geometries in the Small-equivalent size cohort from model years 2023–2027 in the Velopedia archive.M geometry
Archive context: The chainstay of 425 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 50 mm sits somewhat deeper than typical. The head angle of 64° sits somewhat slacker than typical.
Compared with 186 distinct mountain geometries in the Medium-equivalent size cohort from model years 2023–2027 in the Velopedia archive.L geometry
Archive context: Its stack of 653.1 mm sits toward the taller end. The chainstay of 430 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 50 mm sits somewhat deeper than typical.
Compared with 179 distinct mountain geometries in the Large-equivalent size cohort from model years 2023–2027 in the Velopedia archive.XL geometry
Archive context: Its stack of 657.5 mm sits toward the taller end. The chainstay of 430 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 50 mm sits somewhat deeper than typical.
Compared with 158 distinct mountain geometries in the XL-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Used-frameset inspection
If you’re buying this frameset used
Before buying: confirm the serial number and exact model, inspect frame and fork alignment, and inventory every included axle, hanger, clamp, headset part, cable guide and proprietary fitting.
Inspect the frame and fork →- FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
- Included hardwareInventory every axle, hanger, clamp, headset part, cable guide, frame plug and proprietary fitting included with the frameset. Confirm replacement availability before treating a missing small part as insignificant.
- AlignmentSight along the frame and fork from several directions. Confirm that the fork, rear dropouts, head tube and other visible interfaces appear straight; professional measurement is appropriate when alignment cannot be established visually.
Used-frameset inspection checklist 13 universal checks for a record with limited component data Open checklistClose checklist
The archived record does not contain enough component detail for a fully specification-informed frameset checklist. Use these universal checks on the frameset in front of you, inventory every included part and confirm exact interfaces before choosing components.
Identity and fit
Follow the full used-bike inspection order →Archived: 2025 Marin San Quentin 3 Frame Kit · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Series 3 6061 Aluminum, Double Butted, Internal Cable Routing, 12x148mm Thru-Axle, 73mm Threaded BB
Alignment
Inspect the frame and fork →Frame interfaces
Inspect the bottom bracket and shell →Before accepting the frameset
Inspect the frame and fork →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.