Velopedia Bicycle Archive
2026 Transition Spire Alloy Eagle 90
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
- $5,599.00
- Sizes
- S, M, L, XL
- Colors
- Galactic Black, Ultra Violet
- Geometry
- 10 manufacturer sizes · Geometry context
- Record coverage
- 21 preserved details · 2 archived images · original MSRP · preserved geometry
- Archive ID
- 900001461
Frameset
| Frame Construction | Spire Alloy 170mm |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox ZEB Ultimate(170mm) |
| Rear Shock | RockShox Super Deluxe Ultimate(205x65mm) |
Drivetrain
| Shifters | SRAM Eagle 90 MMX |
|---|---|
| Rear Derailleur | SRAM Eagle 90 |
| Crankset | SRAM Eagle 90 DUB(30t/165mm) |
| Cassette | SRAM XS 1275 (10-52T) |
| Chain | SRAM GX Eagle Transmission |
Brakes
| Brakes | SRAM Maven Bronze; Rotors: SRAM Centerline (200mm) |
|---|
Cockpit & Contact Points
| Headset | FSA no.55R/57 |
|---|---|
| Handlebar | Burgtec Ride Wide Alloy Enduro SM(780x20mm)MD(780x30mm)LG/XL(800x38mm) |
| Stem | Burgtec Enduro MK3 35 (35mm) |
| Saddle | SDG Bel Air 3 |
| Seatpost | OneUp Dropper PostSM(150mm)MD(190mm)LG(210mm)XL(240mm) |
Wheels & Tires
| Hubs | DT Swiss 370 Ratchet LN |
|---|---|
| Rims | DT Swiss E 1900 Spline 30 |
| Spokes | DT Swiss Champion |
| Front Tire | Schwalbe Magic MaryRadial, Trail Pro, Ultra Soft (2.5) |
| Rear Tire | Schwalbe AlbertRadial, Gravity Pro, Soft (2.5) |
| 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze SM · High geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze SM · Low geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze MD · High geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze MD · Low geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze LG · High geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze LG · Low geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL · High geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL · Low geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XXL · High geometry 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.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XXL · Low geometry Parts & serviceability
Find replacement parts
SRAM GX Eagle Transmission
Interpreted as SRAM GX · 12-speed Component family — verify exact version
SRAM XS 1275 (10-52T)
Named component · published drivetrain speed — verify exact version
Schwalbe Magic MaryRadial, Trail Pro, Ultra Soft (2.5)
Named tire · verify the exact width
Before ordering: Confirm the exact tire width before ordering.
More qualified parts (6)
Schwalbe AlbertRadial, Gravity Pro, Soft (2.5)
Named tire · verify the exact width
Before ordering: Confirm the exact tire width before ordering.
SRAM Eagle 90
Interpreted as SRAM Eagle 90 · 12-speed Named component · published drivetrain speed — verify exact version
SRAM Eagle 90 MMX
Interpreted as SRAM Eagle 90 · 12-speed Named component · published drivetrain speed — verify exact version
OneUp Dropper PostSM(150mm)MD(190mm)LG(210mm)XL(240mm)
Dropper post identified — verify travel, routing and insertion depth
FSA no.55R/57
Exact archived model
DT Swiss E 1900 Spline 30
Named archived component — verify dimensions
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. Velopedia may also earn from qualifying retailer purchases. Commercial relationships do not influence Archive specifications or analysis.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- 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 →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.Inspect the brakes →
- SuspensionAsk when the fork and shock were last serviced. Check the stanchions for damage, look for oil at the seals, cycle both units through their travel and test the suspension pivots for play.Evaluate the suspension →
- DrivetrainShift through the full range under light load, measure chain wear and inspect the cassette or freewheel teeth. Skipping or hesitation can indicate wear, poor adjustment or mismatched parts.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
Bike-specific inspection checklist 22 checks based on 6 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2026 Transition Spire Alloy Eagle 90 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Spire Alloy 170mm · Fork: RockShox ZEB Ultimate(170mm)
Suspension
Evaluate the suspension →Archived: Fork: RockShox ZEB Ultimate(170mm) · Rear shock: RockShox Super Deluxe Ultimate(205x65mm)
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM Eagle 90 MMX · Rear derailleur: SRAM Eagle 90 · Crankset: SRAM Eagle 90 DUB(30t/165mm) · Cassette: SRAM XS 1275 (10-52t) · Chain: SRAM GX Eagle Transmission
Brakes
Inspect the brakes →Archived: Brakes: SRAM Maven Bronze; Rotors: SRAM Centerline (200mm)
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: DT Swiss E 1900 Spline 30 · Hubs: DT Swiss 370 Ratchet LN · Front tire: Schwalbe Magic MaryRadial, Trail Pro, Ultra Soft (2.5) · Rear tire: Schwalbe AlbertRadial, Gravity Pro, Soft (2.5)
Controls and contact points
Archived: Headset: FSA NO.55R/57 · Handlebar: Burgtec Ride Wide Alloy Enduro SM(780x20mm)MD(780x30mm)LG/XL(800x38mm) · Stem: Burgtec Enduro MK3 35 (35mm) · Seatpost: OneUp Dropper PostSM(150mm)MD(190mm)LG(210mm)XL(240mm) · Saddle: SDG Bel Air 3
Before and during the test ride
Follow the full used-bike inspection order →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.