Velopedia Bicycle Archive
2026 Transition Spire Alloy Frameset
Original manufacturer specifications including 29" wheels, geometry for 10 published sizes.
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What Velopedia knows
- Model year
- 2026
- Category
- Mountain
- Original MSRP
- $2,599.00
- Sizes
- S, M, L, XL
- Colors
- Galactic Black, Ultra Violet
- Geometry
- 10 manufacturer sizes · Geometry context
- Record coverage
- 5 preserved details · 2 archived images · original MSRP · preserved geometry
- Archive ID
- 900001445
Frameset
| Frame Construction | Spire Alloy 170mm |
|---|---|
| Frame Material | Aluminum |
| Rear Shock | RockShox Vivid Ultimate(205x65mm) |
Cockpit & Contact Points
| Headset | FSA NO.55R/57(Included) |
|---|
Wheels & Tires
| Wheel Size | 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 | SM · High | SM · Low | MD · High | MD · Low | LG · High | LG · Low | XL · High | XL · Low | XXL · High | XXL · Low |
|---|---|---|---|---|---|---|---|---|---|---|
| Seat tube | 360 mm | 360 mm | 390 mm | 390 mm | 430 mm | 430 mm | 460 mm | 460 mm | 490 mm | 490 mm |
| Effective top tube | 547 mm | 550 mm | 577 mm | 580 mm | 605 mm | 608 mm | 633 mm | 636 mm | 661 mm | 664 mm |
| Head tube | 100 mm | 100 mm | 100 mm | 100 mm | 110 mm | 110 mm | 120 mm | 120 mm | 130 mm | 130 mm |
| Head-tube angle | 63° | 62.5° | 63° | 62.5° | 63° | 62.5° | 63° | 62.5° | 63° | 62.5° |
| Chainstay / rear center | 446 mm | 448 mm | 446 mm | 448 mm | 446 mm | 448 mm | 452 mm | 454 mm | 452 mm | 454 mm |
| Wheelbase | 1227 mm | 1229 mm | 1257 mm | 1259 mm | 1287 mm | 1289 mm | 1322 mm | 1324 mm | 1352 mm | 1354 mm |
| Bottom-bracket drop | 25 mm | 32 mm | 25 mm | 32 mm | 25 mm | 32 mm | 25 mm | 32 mm | 25 mm | 32 mm |
| Reach | 430 mm | 425 mm | 460 mm | 455 mm | 485 mm | 480 mm | 510 mm | 505 mm | 535 mm | 530 mm |
| Stack | 619 mm | 624 mm | 619 mm | 624 mm | 628 mm | 633 mm | 637 mm | 642 mm | 646 mm | 651 mm |
Geometry source: Transition first-party SBG geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
The manufacturer publishes more than one geometry configuration. Velopedia analyzes each labeled state separately while treating them as one chassis in archive comparisons.
SM geometry
Configuration
Archive context: The head angle of 63° sits toward the slacker end. The chainstay of 446 mm sits toward the longer rear-center end. Its wheelbase of 1227 mm sits toward the longer end.
Compared with 180 distinct mountain geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Archive context: The head angle of 62.5° sits toward the slacker end. The chainstay of 448 mm sits toward the longer rear-center end. Its wheelbase of 1229 mm sits toward the longer end.
Compared with 180 distinct mountain geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.MD geometry
Configuration
Archive context: The head angle of 63° sits toward the slacker end. Its wheelbase of 1257 mm sits toward the longer end. The chainstay of 446 mm sits toward the longer rear-center end.
Compared with 182 distinct mountain geometries in the Medium-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Archive context: The head angle of 62.5° sits toward the slacker end. Its wheelbase of 1259 mm sits toward the longer end. The chainstay of 448 mm sits toward the longer rear-center end.
Compared with 182 distinct mountain geometries in the Medium-equivalent size cohort from model years 2024–2027 in the Velopedia archive.LG geometry
Configuration
Archive context: The head angle of 63° sits toward the slacker end. Its wheelbase of 1287 mm sits toward the longer end. The chainstay of 446 mm sits toward the longer rear-center end.
Compared with 178 distinct mountain geometries in the Large-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Archive context: The head angle of 62.5° sits toward the slacker end. Its wheelbase of 1289 mm sits toward the longer end. The chainstay of 448 mm sits toward the longer rear-center end.
Compared with 178 distinct mountain geometries in the Large-equivalent size cohort from model years 2024–2027 in the Velopedia archive.XL geometry
Configuration
Archive context: The chainstay of 452 mm sits toward the longer rear-center end. The head angle of 63° sits toward the slacker end. Its wheelbase of 1322 mm sits toward the longer end.
Compared with 153 distinct mountain geometries in the XL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Archive context: The head angle of 62.5° sits toward the slacker end. The chainstay of 454 mm sits toward the longer rear-center end. Its wheelbase of 1324 mm sits toward the longer end.
Compared with 153 distinct mountain geometries in the XL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.XXL geometry
Configuration
Archive context: Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. Its wheelbase of 1352 mm sits toward the longer end. The head angle of 63° sits toward the slacker end.
Compared with 23 distinct mountain geometries in the XXL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Archive context: The head angle of 62.5° sits toward the slacker end. Its wheelbase of 1354 mm sits toward the longer end. The chainstay of 454 mm sits toward the longer rear-center end.
Compared with 23 distinct mountain geometries in the XXL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Parts & serviceability
Find replacement parts
FSA NO.55R/57(Included)
Exact archived model
Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Commercial relationships do not influence Archive specifications or analysis.
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 →
- SuspensionAsk when the rear shock was last serviced. Check the shaft and seals for damage or oil, cycle the shock through its travel and test every suspension pivot for play.Evaluate the suspension →
- 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.
Used-frameset inspection checklist 16 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: 2026 Transition Spire Alloy Frameset · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Spire Alloy 170mm
Suspension
Evaluate the suspension →Archived: Rear shock: RockShox Vivid Ultimate(205x65mm)
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.
Have you owned this bike?Help document firsthand fit, ride and maintenance details that may no longer be available.
This archive record has limited published detail. Share what would help another rider understand how this model fit, rode and held up over time. Velopedia reviews every contribution before publication.
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.