Blackthorn Alloy Frame
Blackthorn Alloy Frame
We know you have a “dream build” list hidden away somewhere. Now’s the time to bring it to life on the Blackthorn Aluminum frame. This versatile all-mountain bike frame comes with a RockShox Super Deluxe Select + shock for 140 mm of rear travel. Our tried-and-true Split Pivot suspension design offers a supple, supportive ride with incredible pedaling efficiency so you can take on a huge variety of trails. Start with the best all-mountain bike frame out there, hang your favorite components on it, and let it rip.
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Warning for Residents of California
Warning for Residents of California
⚠️ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.





Bike Key Features
-
Split Pivot Suspension System
View More- Allows us to tune the pedaling and braking forces independently
- Maximizes pedaling and braking performance without compromising either
- Results in optimal pedaling efficiency and traction when braking
-
Split Pivot +
View More- Multiple travel classes in one chassis provides riders with the opportunity to adapt their bikes to various adventures
-
Flip Chip
View More- Provides the ability to alternate wheel and tire sizes
- Riders can adjust for their terrain, or desired handling characteristics
-
On-Bike Storage
View More- Adventures require gear and riders should get to choose whether they carry it on their bike or on their body
-
Frame Protection
View More- Our products are built from experience — we’ve been there enough to know that a carbon fork can benefit from added protection just as much as the downtube on a suspension bike.
Product Details
Build Kit
Frameset
Frame
Blackthorn Aluminum
Color
Brushed Raw Aluminum
Rear Shock
RockShox Super Deluxe Select+
Components
Headset
FSA Orbit 1.5E
Seatpost Clamp
Drivetrain
Wheels
Rear Axle
Salsa Deadbolt rear thru axle, 12 x 197 mm
Geometry

Size | Small | Medium | Large | X-Large |
---|---|---|---|---|
A. Effective Top Tube | 594.0- 593.0 | 616.0- 615.0 | 640.0- 639.0 | 663.0- 662.0 |
B. Stand Over | 726.0- 728.0 | 729.0- 732.0 | 730.0- 733.0 | 730.0- 733.0 |
C. Reach | 448.0- 451.0 | 469.0- 472.0 | 490.0- 493.0 | 510.0- 514.0 |
D. Stack | 611.0- 609.0 | 615.0- 613.0 | 624.0- 622.0 | 633.0- 630.0 |
E. Total Seat Tube Length | 405.0 | 430.0 | 455.0 | 480.0 |
F. Headtube Length | 95.0 | 100.0 | 110.0 | 120.0 |
G. Headtube Angle |
64.6 -
64.9
|
64.6 -
64.9
|
64.6 -
64.9
|
64.6 -
64.9
|
H. Seat Tube Angle |
76.5 -
76.8
|
76.5 -
76.8
|
76.5 -
76.8
|
76.5 -
76.8
|
I. BB Drop | 26.0- 22.0 | 26.0- 22.0 | 26.0- 21.0 | 26.0- 21.0 |
K. Chainstay Length | 432.0- 431.0 | 432.0- 431.0 | 432.0- 431.0 | 432.0- 431.0 |
L. Fork Length Axle to Crown | 569.0 | 569.0 | 569.0 | 569.0 |
M. Fork Offset | 43.0 | 43.0 | 43.0 | 43.0 |
N. Wheelbase | 1204.0- 1204.0 | 1228.0- 1227.0 | 1253.0- 1252.0 | 1278.0- 1278.0 |
Crank Arm Length | ||||
Handlebar Width | ||||
Recommended Rider Height | 165.0 - 173.0 | 173.0 - 180.0 | 180.0 - 188.0 | 188.0 |
Stem Length |
Measurements based on:
- an unsprung bike (no sag)
- a 29 x 2.4" tire measuring 746mm in diameter
- Standover is measured from vertically from ground to top of top tube 50mm forward of bottom bracket, subtract 9mm (0.3") for 27.5 x 2.8" tires
- Note: Where two measurements are listed, the first number is with Flip Chip in Low position; the second number is with Flip Chip in High position
Frame Specs
- Design Wheel/Tire Sizes 29 x 1.9–2.6"
- Alternate Wheel/Tire Sizes 27.5 x 2.8–3.0"
- Suspension Fork Length (Travel) 140–160 mm
- Fork Offset 42–51 mm
- Rear Spacing 157 x 12 mm TA
- Rear Axle Size 12 x 197 mm, TP = 1.75, TL = 20 mm
- Headset - Upper ZS44
- Headset - Lower ZS56
- Rear Shock Size 210 x 52.5 mm
- Shock Mount, Fore Ø8 x 30mm
- Pivot Kit 1215, 1585, 1587, 1589, 1590, 1592, 1594
- Seatpost 30.9 mm
- Dropper Post Compatible Yes (internal)
- Seatpost Clamp 35.4 mm
- Max Post Insertion SM = 195 mm, MD = 220 mm, LG = 245 mm, XL = 270 mm
- Front Derailleur Clamp N/A
- Front Derailleur Type N/A
- Derailluer Hanger FS2322
- Bearings 17287 (Qty 4), 6801 (Qty 6)
- Bottom Bracket 73 mm BSA, threaded
- Crankset (Max Ring) Super Boost 157, 55–57 mm chainline (34t)
- Accessory Mounts Top Tube Mounts: Compatible with Salsa EXP Series Direct Mount Top Tube Bag
- Bottle Mounts 1
Supportive Documents
Support Document links
- Bicycle Owner's Manual
- ASTM 4 Framesheet
- Gen 4 Split Pivot Suspension Setup
- Main Pivot Instructions
- Control Link Pivot Instructions
- Rear Axle Pivots and Hanger Instructions
- Link Bolt Instructions
- Shock Mount Hardware Instructions
- Flip Chip 2.0 Shock Mount Hardware
- Blackthorn / Cassidy Conversions
- Cable Port Frame Plug Instructions
- ASTM Riding Conditions Classifications
Additional Features
Split Pivot Rear Suspension
Split Pivot provides a host of impressive suspension characteristics because the system isolates pedaling forces and braking forces from each other, allowing us to tune and optimize the bike for both independently. The concentric rear axle pivot, in conjunction with precise wheel link, brake link, and control link placement, results in excellent bump compliance and pedaling efficiency, smooth and predictable braking throughout travel, and maximum traction
Split Pivot+ Design Methodology
The Split Pivot+ design methodology allows our engineers to optimize a frame for more than one travel class. This means that Blackthorn riders can swap control and shock links, in addition to the rear shock and fork, to switch travel to Cassidy’s 165 mm rear and 180 mm front capability. One frame, multiple bikes
Purpose-Tuned Suspension
The Blackthorn-specific control link and shock links optimize the frame geometry and kinematics for its suspension travel, delivering a well-rounded, balanced trail feel
Progressive Geometry
Blackthorn is long, low, and slack, with a dash of moderation to preserve pedaling performance. A 64.6-degree head tube angle and short-offset fork feel confident when descending loose, steep trails or blasting through rock gardens. A steep 76.5-degree seat tube angle and consistent cockpit sizing makes for a comfortable pedaling position, while the moderate bottom bracket height provides stability at speed without sacrificing pedaling performance in technical sections. The long front center provides stability in extreme terrain while the short 432 mm chainstays make for nimble handling in tight situations
Flip Chip 2.0
Integrated into the shock link mount, Flip Chip 2.0 allows simple, quick adjustments to bottom bracket height and head tube angle to account for the rider’s personal preference, terrain, or wheel size and tire diameter
EPS Carbon Main Triangle with Carbon Seatstays and Aluminum Chainstays
EPS construction allows for greater manufacturing control, smooth surfacing, a simplified bottom bracket junction, and an integrated shock mount. Carbon fiber material offers improved stiffness, better vibration damping, excellent toughness and weight savings compared to other materials. 6066-T6 aluminum heat-treated chainstays add durability
Top Tube Accessory Mounts
Top tube mounts accommodate K-Edge Top Tube Mount for bike computers or the Salsa EXP Series Direct Mount Top Tube Bag
Down Tube Three-Pack Mounts
Three-Pack mounts on down tube accommodate a large water bottle on the lower pair and a frame-mounted pump bracket on the upper pair
Integrated Repair Kit Location
Three-Pack mounts on down tube accommodate a large water bottle on the lower pair and a frame-mounted pump bracket on the upper pair
Accommodates a 26 oz Bottle
All Blackthorn sizes accept a standard 26 oz water bottle within the front triangle
Internal Sleeved Cable Routing
Internal tubes guide housing through the frame, simplifying setup and maintenance, and creating a clean bike profile
Molded Frame Protection
Molded rubber down tube, seat tube, chainstay, and seatstay guards protect your frame from impacts and abrasion
Versatile Tire Fit
Spec’d as a 29er, Blackthorn is also capable of running 27.5 x 2.8-3.0" wheels and tires
Stealth Dropper Post Routing
Compatible with 30.9mm dropper posts for true trail bike performance
Remote Lockout Ready
Blackthorn comes equipped for remote lockout, with cable routing to the rear shock via a cable port on the drive side of the downtube that exits between the forward shock mounting plates.
FAQ
How do I convert my Blackthorn to a Cassidy?
Follow these instructions
Can I run a coil shock?
No, the leverage rate of the Blackthorn is optimized for the natural progressivity of air spring shocks. A coil shock will not produce enough end-stroke support at the rear wheel, leading to frequent and harsh bottom-outs that will likely result in frame damage. Fitting a coil shock to this frame voids the warranty.
Can I run a mullet setup on this bike?
Yes, for Blackthorn mullet setup requirements:
- Minimum fork travel: 160 mm; minimum fork axle to crown: 573 mm
- Minimum front tire size: 29 x 2.4"
- Minimum rear size: 27.5 x 2.5"
- Maximum crank arm length: 170 mm
- Flip chip position must be set to high
How does the geometry change if I use a suspension fork with 150mm travel?
See the Blackthorn geometry chart for alternate fork size specs.
Do you offer touch-up paint?
No, we do not offer touch up paint. Hobby shops or automotive stores are excellent places to find paint. We suggest you test the paint on a scrap piece of metal before using it on your frame.
I crashed and dented (or cracked) my frame. Is it safe to ride?
Stop riding your frame immediately and take it to the nearest Salsa authorized dealer for inspection. A dented or cracked tube represents a structural weakening of the frame, and is a safety risk.
What is the warranty for this bike?
View Warranty
Warranty Information
All Salsa products are warranted against manufacturing defects in materials and workmanship from the date of retail purchase of the product, subject to the limitations detailed below.