Velopedia Bicycle Archive
2026 Salsa Blackthorn 145 C Eagle 90 Transmission
Mountain bicycle from the Velopedia specification archive.
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- Original MSRP
- $4,999.00
- Sizes
- S, M, L, XL
- Colors
- Black/Graphite Gray
- Weight
- 33 lb 15 oz
- Geometry
- 4 manufacturer sizes · Ride analysis
- Archive ID
- 900000405
Current market
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Velopedia analysis
What the specifications mean
The fork provides the documented suspension, so fork setup and rear-tire pressure are the main adjustments for balancing the two ends of the bike. Both 27.5- and 29-inch wheels appear in the record, but it does not establish a mixed front/rear build; confirm the correct diameter for the selected frame size. The 520% cassette range describes the available gearing more clearly than the component-group name alone.
Suspension setup
Front only
Fork settings affect the front while rear-wheel behavior remains dependent on tire and wheel setup.
Wheel system
27.5 / 29 options
Both diameters are documented, but the archive does not prove a mixed front/rear setup.
Gearing
520% cassette range
Calculated from the published 10–52-tooth sprocket span.
Frame material
Carbon / composite
Look for impact damage and clamp marks rather than metal-style dents or rust.
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 →- FrameInspect the frame in bright light, especially around the head tube, bottom bracket, chainstays and clamped areas. Look for cracks, ripples, crushed sections or signs of a previous impact.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 was last serviced. Check the stanchions for damage, look for oil at the seals and make sure the fork moves smoothly without bushing play.Evaluate the suspension →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 12-speed system.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 20 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 Salsa Blackthorn 145 C Eagle 90 Transmission · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Carbon · Fork: FOX 36 Performance, GRIP, 44mm offset, 160mm
Suspension
Evaluate the suspension →Archived: Fork: FOX 36 Performance, GRIP, 44mm offset, 160mm
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM Eagle 90 Transmission · Rear derailleur: SRAM Eagle 90 Transmission · Crankset: SRAM Eagle 90 Transmission, 30t, single guard · Bottom bracket: SRAM DUB MTB Wide BSA · Cassette: SRAM XS-1270 Eagle Transmission, 10–52t, 12-speed · Chain: SRAM GX Eagle Transmission Flattop
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: SRAM Maven Base, 4-piston; Brake Levers: SRAM Maven Base; Rotors: SRAM CenterLine 2.0 (6-bolt, 200mm front and rear)
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29"; 27.5" · Rims: WTB KOM Trail i30 TCS, 32h, 29" · Hubs: (F) WTB Frequency 3x 15 x 110mm / (R) WTB Frequency 3x 12 x 148mm · Front tire: Teravail Kessel 29 x 2.5", 60TPI Durable casing, Grip Plus compound (WTB TCS valve and sealant included) · Rear tire: Teravail Kessel 29 x 2.5", 120TPI Durable Plus casing, Grip Plus compound (WTB TCS valve and sealant included)
Controls and contact points
Archived: Headset: FSA Orbit 1.5E ZS NO.57E · Handlebar: Race Face Chester, 35.0 · Stem: Salsa Guide 35.0 · Seatpost: TranzX REVERSE YSI35 w/ GL MMX lever · Saddle: WTB Solano Steel Fusion Form, medium
Before and during the test ride
Follow the full used-bike inspection order →Interpretation based on the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Frameset
| Frame Construction | Carbon |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | FOX 36 Performance, GRIP, 44mm offset, 160mm |
Drivetrain
| Shifters | SRAM Eagle 90 Transmission |
|---|---|
| Front Derailleur | N/A |
| Rear Derailleur | SRAM Eagle 90 Transmission |
| Crankset | SRAM Eagle 90 Transmission, 30t, single guard |
| Bottom Bracket | SRAM DUB MTB Wide BSA |
| Cassette | SRAM XS-1270 Eagle Transmission, 10–52t, 12-speed |
| Chain | SRAM GX Eagle Transmission Flattop |
Brakes
| Brakes | Brake Calipers: SRAM Maven Base, 4-piston; Brake Levers: SRAM Maven Base; Rotors: SRAM CenterLine 2.0 (6-bolt, 200mm front and rear) |
|---|
Cockpit & Contact Points
| Headset | FSA Orbit 1.5E ZS NO.57E |
|---|---|
| Handlebar | Race Face Chester, 35.0 |
| Stem | Salsa Guide 35.0 |
| Saddle | WTB Solano Steel Fusion Form, medium |
| Seatpost | TranzX REVERSE YSI35 w/ GL MMX lever |
Wheels & Tires
| Hubs | (F) WTB Frequency 3x 15 x 110mm / (R) WTB Frequency 3x 12 x 148mm |
|---|---|
| Rims | WTB KOM Trail i30 TCS, 32h, 29" |
| Spokes | Double-butted |
| Front Tire | Teravail Kessel 29 x 2.5", 60TPI Durable casing, Grip Plus compound (WTB TCS valve and sealant included) |
| Rear Tire | Teravail Kessel 29 x 2.5", 120TPI Durable Plus casing, Grip Plus compound (WTB TCS valve and sealant included) |
| Wheel Size | 29"; 27.5" |
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 | Small | Medium | Large | X-Large |
|---|---|---|---|---|
| Seat tube | 405 mm | 430 mm | 455 mm | 480 mm |
| Effective top tube | 589 mm | 611 mm | 633 mm | 655 mm |
| Head tube | 100 mm | 110 mm | 120 mm | 130 mm |
| Head-tube angle | 63.9- 63.6 | 63.9- 63.6 | 63.9- 63.6 | 63.9- 63.6 |
| Seat-tube angle | 77.4- 77.1 | 77.4- 77.1 | 77.4- 77.1 | 77.4- 77.1 |
| Chainstay / rear center | 432 mm | 432 mm | 432 mm | 432 mm |
| Wheelbase | 1219 mm | 1243 mm | 1268 mm | 1292 mm |
| Bottom-bracket drop | 25 mm | 25 mm | 25 mm | 25 mm |
| Bottom-bracket height | 351 mm | 351 mm | 351 mm | 351 mm |
| Reach | 452 mm | 472 mm | 492 mm | 512 mm |
| Stack | 612 mm | 621 mm | 630 mm | 639 mm |
| Standover height | 746 mm | 746 mm | 747 mm | 747 mm |
| Fork offset / rake | 43 mm | 43 mm | 43 mm | 43 mm |
| Fork length / axle-to-crown | 571 mm | 571 mm | 571 mm | 571 mm |
| Crank length | 165 mm | 165 mm | 165 mm | 165 mm |
| Stem length | 40 mm | 40 mm | 40 mm | 40 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 interpretation
What this geometry means
The archived table contains multiple manufacturer geometry states. Velopedia preserves source order and analyzes each state separately rather than averaging the published values.
Small geometry
Configuration
Riding position
A 452 mm reach paired with 612 mm of stack gives this size a moderate frame proportion: roomy enough when standing without pushing strongly toward either a very low or very upright front end. Its 77.4° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.9° head angle combined with a 1219 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 2, this configuration steepens the head angle by 0.3°.
Archive context
Its reach of 452 mm sits toward the longer end. Its wheelbase of 1219 mm sits toward the longer end. The head angle of 63.9° sits toward the slacker end.
Riding position
A 452 mm reach paired with 612 mm of stack gives this size a moderate frame proportion: roomy enough when standing without pushing strongly toward either a very low or very upright front end. Its 77.1° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.6° head angle combined with a 1219 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 1, this configuration slackens the head angle by 0.3°.
Archive context
The head angle of 63.6° sits toward the slacker end. Its reach of 452 mm sits toward the longer end. Its wheelbase of 1219 mm sits toward the longer end.
Medium geometry
Configuration
Riding position
A 472 mm reach paired with 621 mm of stack gives this size a moderate frame proportion: roomy enough when standing without pushing strongly toward either a very low or very upright front end. Its 77.4° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.9° head angle combined with a 1243 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 2, this configuration steepens the head angle by 0.3°.
Archive context
Its reach of 472 mm sits toward the longer end. The seat angle of 77.4° sits toward the steeper end. Its bottom-bracket drop of 25 mm sits toward the shallower-drop end.
Riding position
A 472 mm reach paired with 621 mm of stack gives this size a moderate frame proportion: roomy enough when standing without pushing strongly toward either a very low or very upright front end. Its 77.1° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.6° head angle combined with a 1243 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 1, this configuration slackens the head angle by 0.3°.
Archive context
Its reach of 472 mm sits toward the longer end. The head angle of 63.6° sits toward the slacker end. Its bottom-bracket drop of 25 mm sits toward the shallower-drop end.
Large geometry
Configuration
Riding position
With 492 mm of reach and 630 mm of stack, the frame has a relatively long, low proportion that should leave plenty of room when standing and put the front end toward the lower side of modern mountain-bike fit. Its 77.4° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.9° head angle combined with a 1268 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 2, this configuration steepens the head angle by 0.3°.
Archive context
Its reach of 492 mm sits toward the longer end. The seat angle of 77.4° sits toward the steeper end. Its bottom-bracket drop of 25 mm sits toward the shallower-drop end.
Riding position
With 492 mm of reach and 630 mm of stack, the frame has a relatively long, low proportion that should leave plenty of room when standing and put the front end toward the lower side of modern mountain-bike fit. Its 77.1° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.6° head angle combined with a 1268 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 1, this configuration slackens the head angle by 0.3°.
Archive context
Its reach of 492 mm sits toward the longer end. Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. The head angle of 63.6° sits toward the slacker end.
X-Large geometry
Configuration
Riding position
With 512 mm of reach and 639 mm of stack, the frame has a relatively long, low proportion that should leave plenty of room when standing and put the front end toward the lower side of modern mountain-bike fit. Its 77.4° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.9° head angle combined with a 1292 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 2, this configuration steepens the head angle by 0.3°.
Archive context
Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. The seat angle of 77.4° sits toward the steeper end. Its reach of 512 mm sits somewhat longer than typical.
Riding position
With 512 mm of reach and 639 mm of stack, the frame has a relatively long, low proportion that should leave plenty of room when standing and put the front end toward the lower side of modern mountain-bike fit. Its 77.1° effective seat angle places the seated rider relatively forward, a layout that generally helps keep body weight centered on steep climbs.
Handling tendencies
A 63.6° head angle combined with a 1292 mm wheelbase points to strongly stability-oriented steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Configuration changes
Compared with Configuration 1, this configuration slackens the head angle by 0.3°.
Archive context
Its bottom-bracket drop of 25 mm sits toward the shallower-drop end. The head angle of 63.6° sits toward the slacker end. Its reach of 512 mm sits somewhat longer than typical.
Geometry describes frame proportions and likely tendencies, not a ride test. Rider proportions, cockpit setup, tires, suspension settings, wheel configuration, and component choices can materially change how a bicycle fits and feels.
Gallery
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.