Velopedia Bicycle Archive
2026 Transition Sentinel Alloy Eagle 90
Original manufacturer specifications including 29" & Mixed wheels, geometry for 8 published sizes.
Selling this bike? Create a shareable bike record
What Velopedia knows
- Model year
- 2026
- Category
- Mountain
- Original MSRP
- $5,499.00
- Sizes
- Small MX, Medium MX, Medium 29, Large MX, Large 29, X-Large 29
- Colors
- Silver Mist, Desert Dusk
- Geometry
- 8 manufacturer sizes · Geometry context
- Record coverage
- 21 preserved details · 4 archived images · original MSRP · preserved geometry
- Archive ID
- 900001585
Frameset
| Frame Construction | Sentinel Alloy 150mm |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Lyrik Ultimate(160mm) |
| Rear Shock | RockShox Super Deluxe Ultimate(205x60mm) |
Drivetrain
| Shifters | SRAM Eagle 90 MMX |
|---|---|
| Rear Derailleur | SRAM Eagle 90 |
| Crankset | SRAM Eagle 90 DUB29(30t/165mm)27.5(32t/165mm) |
| Cassette | SRAM XS 1275 T-Type (10-52t) |
| Chain | SRAM GX Eagle Transmission |
Brakes
| Brakes | SRAM Maven Silver; Rotors: SRAM Centerline (180/200mm) |
|---|
Cockpit & Contact Points
| Headset | FSA No.57E |
|---|---|
| Handlebar | Race Face TurbineXS(760x20)SM(780x20)MD(780x40)LG/XL/XXL(800x40) |
| Stem | Race Face Aeffect R (40mm) |
| Saddle | SDG Bel Air 3 |
| Seatpost | OneUp Dropper PostXS(120mm)SM(150mm)MD(190mm)LG(210mm)XL/XXL(240mm) |
Wheels & Tires
| Hubs | DT Swiss 370 Ratchet LN |
|---|---|
| Rims | DT Swiss M 1900 Spline 30 |
| Spokes | DT Swiss Champion |
| Front Tire | Maxxis Assegai 3CMaxxGrip EXO+ (2.5) |
| Rear Tire | Maxxis Minion DHRII3C MaxxTerra EXO+ (2.4) |
| Wheel Size | 29" & Mixed |
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 · Alloy Mixed | MD · Alloy Mixed | LG · Alloy Mixed | XL · Alloy Mixed | SM · Alloy 29 | MD · Alloy 29 | LG · Alloy 29 | XL · Alloy 29 |
|---|---|---|---|---|---|---|---|---|
| Seat tube | 360 mm | 390 mm | 430 mm | 460 mm | 360 mm | 390 mm | 430 mm | 460 mm |
| Effective top tube | 557 mm | 586 mm | 614 mm | 642 mm | 557 mm | 586 mm | 614 mm | 642 mm |
| Head tube | 100 mm | 110 mm | 120 mm | 130 mm | 100 mm | 110 mm | 120 mm | 130 mm |
| Head-tube angle | 63.6° | 63.6° | 63.6° | 63.6° | 64° | 64° | 64° | 64° |
| Chainstay / rear center | 440 mm | 440 mm | 440 mm | 444 mm | 442 mm | 442 mm | 442 mm | 446 mm |
| Wheelbase | 1208 mm | 1237 mm | 1267 mm | 1300 mm | 1208 mm | 1237 mm | 1267 mm | 1300 mm |
| Bottom-bracket drop | 31 mm | 31 mm | 31 mm | 31 mm | 25 mm | 25 mm | 25 mm | 25 mm |
| Reach | 426 mm | 451 mm | 476 mm | 501 mm | 430 mm | 455 mm | 480 mm | 505 mm |
| Stack | 618 mm | 624 mm | 636 mm | 646 mm | 615 mm | 621 mm | 633 mm | 642 mm |
| Standover height | 690 mm | 690 mm | 695 mm | 705 mm | 690 mm | 690 mm | 695 mm | 705 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
MD · Alloy Mixed geometry
Archive context: Its reach of 451 mm sits toward the longer end. Its wheelbase of 1237 mm sits toward the longer end. Its stack of 624 mm sits toward the taller end.
Compared with 56 distinct mountain geometries in the XS-equivalent size cohort from model years 2024–2027 in the Velopedia archive.LG · Alloy Mixed geometry
Archive context: Its reach of 476 mm sits toward the longer end. Its wheelbase of 1267 mm sits toward the longer end. Its stack of 636 mm sits toward the taller end.
Compared with 180 distinct mountain geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.XL · Alloy Mixed geometry
Archive context: Its wheelbase of 1300 mm sits toward the longer end. Its reach of 501 mm sits toward the longer end. Its stack of 646 mm sits toward the taller end.
Compared with 180 distinct mountain geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.SM geometry
Alloy 29
Archive context: The chainstay of 442 mm sits toward the longer rear-center end. Its wheelbase of 1208 mm sits somewhat longer than typical. Its bottom-bracket drop of 25 mm sits somewhat shallower than typical.
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 · Alloy 29 geometry MD geometry
Alloy 29
Archive context: The chainstay of 442 mm sits toward the longer rear-center end. Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. Its wheelbase of 1237 mm sits somewhat longer than typical.
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 · Alloy 29 geometry LG geometry
Alloy 29
Archive context: Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. The chainstay of 442 mm sits somewhat longer than typical. Its wheelbase of 1267 mm sits somewhat longer than typical.
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 · Alloy 29 geometry XL geometry
Alloy 29
Archive context: Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. The chainstay of 446 mm sits toward the longer rear-center end. Its wheelbase of 1300 mm sits somewhat longer than typical.
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 · Alloy 29 geometry Parts & serviceability
Find replacement parts
SRAM GX Eagle Transmission
Interpreted as SRAM GX · 12-speed Component family — verify exact version
SRAM XS 1275 T-Type (10-52t)
Named component · published drivetrain speed — verify exact version
SRAM Eagle 90
Interpreted as SRAM Eagle 90 · 12-speed Named component · published drivetrain speed — verify exact version
More qualified parts (5)
SRAM Eagle 90 MMX
Interpreted as SRAM Eagle 90 · 12-speed Named component · published drivetrain speed — verify exact version
Race Face Aeffect R (40mm)
Named archived component — verify dimensions
FSA No.57E
Exact archived model
DT Swiss M 1900 Spline 30
Named archived component — verify dimensions
DT Swiss 370 Ratchet LN
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 Sentinel Alloy Eagle 90 · Mountain · Published sizes: Small MX, Medium MX, Medium 29, Large MX, Large 29, X-Large 29
Frame and fork
Inspect the frame and fork →Archived: Frame: Sentinel Alloy 150mm · Fork: RockShox Lyrik Ultimate(160mm)
Suspension
Evaluate the suspension →Archived: Fork: RockShox Lyrik Ultimate(160mm) · Rear shock: RockShox Super Deluxe Ultimate(205x60mm)
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM Eagle 90 MMX · Rear derailleur: SRAM Eagle 90 · Crankset: SRAM Eagle 90 DUB29(30t/165mm)27.5(32t/165mm) · Cassette: SRAM XS 1275 T-Type (10-52t) · Chain: SRAM GX Eagle Transmission
Brakes
Inspect the brakes →Archived: Brakes: SRAM Maven Silver; Rotors: SRAM Centerline (180/200mm)
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" & Mixed · Rims: DT Swiss M 1900 Spline 30 · Hubs: DT Swiss 370 Ratchet LN · Front tire: Maxxis Assegai 3CMaxxGrip EXO+ (2.5) · Rear tire: Maxxis Minion DHRII3C MaxxTerra EXO+ (2.4)
Controls and contact points
Archived: Headset: FSA No.57E · Handlebar: Race Face TurbineXS(760x20)SM(780x20)MD(780x40)LG/XL/XXL(800x40) · Stem: Race Face Aeffect R (40mm) · Seatpost: OneUp Dropper PostXS(120mm)SM(150mm)MD(190mm)LG(210mm)XL/XXL(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.
Have you owned this bike?Help preserve its real-world history by sharing your owner experience.
Share the details that would help another rider understand how this model fits, rides and holds up over time. Velopedia reviews every contribution before publication.
Already contributed? Send me a fresh private edit link
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
Gallery
Current market
Snapshot not yet availableProtected live updateReady after page interactionAutomated crawlers do not trigger marketplace requests.
Move, scroll, tap or type to start the protected update.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.