Blackthorn 125 C GX Transmission Full Suspension Mountain Bike
Every bike is fully assembled, tuned, and test-ridden before pickup at your chosen DFW Bike Mart location.
Expected ship date: {date+3}
Professionally built and test-ridden before it ships. Arrives mostly assembled with just minimal setup needed. See Reassembly Instructions
Delivered fully assembled and tuned by Bike Mart - ready to ride right at your doorstep within 10 miles of any DFW location.
Complete your Ride
What is the Bike Mart Return policy?
What is the Bike Mart Return policy?
Bike Mart offers a 14-day return and 30-day exchange policy in effect on qualifying items. Restocking fee may apply for "At Warehouse" Items. Read More
What Financing options does Bike Mart offer?
What Financing options does Bike Mart offer?
Financing is easier than ever at Bike Mart. With Synchrony Financial, you can choose:
- 0% APR for 6 months — on orders under $999
- 0% APR for 12 months — on orders of $1,000 or more
We also support HSA/FSA Funds with TrueMed, Shop Pay Installments and PayPal Financing.
Ship
Get your bike or equipment delivered to your home directly from Bike Mart via our FedEx or USPS Carrier partners. Adult signature is required for all bike deliveries and for equipment & gear deliveries over $500.
For orders that include a bike, it will be professionally pre-built and shipped to your home with minimal assembly needed. While we try to make it as easy as possible, basic mechanical skills and proper tools are required.
If you decide to take your bike to a local bike shop for assembly, additional fees will apply.
Pickup
We’ve made it easier than ever to get the gear and bikes you love—fast. With our Buy Online, Pick Up In Store (BOPIS) option, you can shop online and pick up your items at your convenience from any of our six DFW locations.
The best part about picking up at a Bike Mart location is that you get the same high quality service with the convenience of having the exact bike or part.
Bikes / Car Racks will be assembled and installed at no extra charge and might require additional processing time for assembly.
Delivery
When you select "Home Delivery" at checkout. Your bike will be professionally assembled and the closest Bike Mart store will call you to schedule the delivery.
We offer home delivery for bike purchases only within 10 miles of a Bike Mart location. Contact us if you live beyond 10 miles and we can discuss more options. Additional fees may apply.
In stock bikes will be delivered within 7 days. Warehouse bikes will delivered within 14 days*.
Bike Key Features
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Split Pivot Suspension System
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
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Split Pivot +
Multiple travel classes in one chassis provides riders with the opportunity to adapt their bikes to various adventures
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Flip Chip
Provides the ability to alternate wheel and tire sizes Riders can adjust for their terrain, or desired handling characteristics
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Suspension Kinematics
Lively, responsive ride feel with good bottom-out resistance Free, active, and uniform suspension feel under braking Efficient pedaling, stellar climbing traction, supple small-bump performance Tunable for all riders
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On-Bike Storage
Adventures require gear and riders should get to choose whether they carry it on their bike or on their body
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Frame Protection
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.
Overview
Overview
Blackthorn 125 C GX Transmission is part playful, part precision. Its stiff carbon frame keeps you on-track through techy sections, and our trail geometry strikes a balance of composure on descents and pedaling comfort on climbs.
125mm of Split Pivot rear suspension pushes you to push your limits, with excellent pedaling efficiency, a supportive ride, and active performance even while braking so you don’t lose your line on a choppy descent. Paired with a 140mm Fox 34 Performance Elite fork, it has the travel to progress to some stouter lines.
Blackthorn also puts bigger trail days in reach with dedicated space for two bottles, your repair kit, and a top tube bag or computer mount — leave the hip pack at home. Topping it all off is SRAM’s GX Transmission drivetrain, a stalwart selection for its dead-accurate electronic shifting and bring-it-on durability.
Blackthorn’s ability to both thread the needle and cut loose make it one of the best all-around mountain bike options out there — riding is believing.
Technical Specifications
Technical Specifications
| Frame | Blackthorn 125 Carbon |
| Color | Slate/Citrus |
| Suspension fork | Fox 36SL Performance Elite Float X2, 140mm |
| Rear shock | Fox Float X Performance Elite |
| Headset | FSA Orbit 1.5E ZS NO.57E |
| Seatpost | TranzX REVERSE w/ GL Stealth MMX Lever, SM: 160mm travel; MD: 180mm travel; LG–XL: 210mm travel |
| Stem | Salsa 35.0 Guide Trail, 40mm |
| Grips/bar tape | WTB Wavelength Lock-On |
| Saddle | WTB Solano, Medium, Steel SL, Fusion Form |
| Handlebar | Race Face Turbine |
| Front derailleur | N/A |
| Rear derailleur | SRAM GX Eagle AXS Transmission |
| Cassette | SRAM GX Eagle Transmission, 10–52t, 12-speed |
| Chain | SRAM GX Eagle Transmission Flattop |
| Crankset | SRAM GX Eagle Transmission, 30t w/ MRP 1x iO SL ISCG-05 aluminum bashguard |
| Shifter | SRAM AXS Pod controller, Right, w/ MatchMaker X Clamp |
| Brake levers | SRAM Code Bronze Stealth |
| Brake calipers | SRAM Code Bronze Stealth |
| Bottom bracket | SRAM DUB BSA 73mm MTB Wide |
| Rotors | SRAM CenterLine 2.0 (6-bolt, 200mm front, 180mm rear) |
| Front tire | Teravail Clifty, 29 x 2.5", Durable casing, WTB TCS Sealant Included |
| Rear tire | Teravail Drawpoint, 29 x 2.5", Durable casing, WTB TCS Sealant Included |
| Front hub | WTB Frequency 15 x 110mm |
| Rear hub | WTB Frequency 12 x 148mm |
| Spoke | Butted steel, black |
| Rim | WTB ASYM i30 TCS, 28h |
| Complete bike | 31 lb. 9 oz. |
Parts are subject to change without notice. Chat with us if you have any questions.
Geometry
Geometry
All measurements provided in mm unless otherwise noted; head tube angles are in degrees. Measurements based on: an unsprung bike (no sag) a 29 x 2.5" tire measuring 752mm in diameter Standover is measured from vertically from ground to top of top tube 50mm forward of bottom bracket center Note: Where two measurements are listed, the first number is with Flip Chip in default High position; the second number is with Flip Chip in Low position
| Frame size | Small | Medium | Large | X-Large |
| A. Effective Top Tube (mm) | 587.0 mm - 588.0 mm | 609.0 mm - 610.0 mm | 631.0 mm - 632.0 mm | 653.0 mm - 654.0 mm |
| B. Stand Over (mm) | 736.0 mm - 733.0 mm | 736.0 mm - 733.0 mm | 737.0 mm - 733.0 mm | 737.0 mm - 733.0 mm |
| C. Reach (mm) | 462.0 mm - 458.0 mm | 482.0 mm - 478.0 mm | 502.0 mm - 498.0 mm | 521.0 mm - 518.0 mm |
| D. Stack (mm) | 605.0 mm - 609.0 mm | 614.0 mm - 617.0 mm | 623.0 mm - 626.0 mm | 632.0 mm - 635.0 mm |
| E. Total Seat Tube Length (mm) | 405.0 mm | 430.0 mm | 455.0 mm | 480.0 mm |
| F. Headtube Length (mm) | 100.0 mm | 110.0 mm | 120.0 mm | 130.0 mm |
| G. Headtube Angle (degrees) | 64.7 | 64.7 | 64.7 | 64.7 |
| H. Seat Tube Angle (degrees) | 78.3 | 78.3 | 78.3 | 78.2 |
| I. BB Drop (mm) | 32.0 mm - 36.0 mm | 31.0 mm - 36.0 mm | 31.0 mm - 36.0 mm | 31.0 mm - 36.0 mm |
| J. BB Height (mm) | 344.0 mm - 340.0 mm | 345.0 mm - 340.0 mm | 345.0 mm - 340.0 mm | 345.0 mm - 340.0 mm |
| K. Chainstay Length (mm) | 432.0 mm - 433.0 mm | 432.0 mm - 433.0 mm | 432.0 mm - 433.0 mm | 432.0 mm - 433.0 mm |
| L. Fork Length Axle to Crown (mm) | 551.0 mm | 551.0 mm | 551.0 mm | 551.0 mm |
| M. Fork Offset (mm) | 43.0 mm | 43.0 mm | 43.0 mm | 43.0 mm |
| N. Wheelbase (mm) | 1211.0 mm - 1211.0 mm | 1236.0 mm - 1235.0 mm | 1260.0 mm - 1260.0 mm | 1283.0 mm - 1284.0 mm |
| Crank Arm Length (mm) | 165.0 mm | 165.0 mm | 170.0 mm | 170.0 mm |
| Handlebar Width (cm) | 760.0 cm | 800.0 cm | 800.0 cm | 800.0 cm |
| Recommended Rider Height (cm) | 157.0 cm - 170.0 cm | 168.0 cm - 180.0 cm | 178.0 cm - 191.0 cm | 188.0 cm - 201.0 cm |
| Stem Length (mm) | 40.0 mm | 40.0 mm | 40.0 mm | 40.0 mm |
This Geometry Chart is provided by the Manufactuer. Chat with us if you have any questions.
Why Shop at Bike Mart?
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Live Chat with Real People
Get instant advice and answers from our team of cycling experts through our online chat feature or over the phone.
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Community-Focused
We have donated over a million dollars to support our communities through charity rides, bike rallies and advocacy for more bikeable trails in Texas.
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Professional, Quality Assembly
Our bikes are expertly assembled and inspected by Bike Mart’s professionally trained staff. They ensure proper adjustments, tighten and true wheels, and get your bike ready to ride.
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Our Legacy of Excellence
With 62 years of retail experience, Bike Mart brings unparalleled expertise and dedication to serving you.
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10% off accessories with new bike purchase
Receive 10% off all accessories purchased with a new bike.
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Hassle-Free Returns
Easily initiate returns for online orders with our straightforward return policy to shop with confidence.
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Locally Owned & Operated
A family of cyclists who live and ride in your community—feel right at home.
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Free accessory installation with new bike purchase
Let our experts install your accessories at no extra cost, ensuring everything fits perfectly and is ready for your ride!
