Santa Cruz Bullit 4 CC X0 AXS Reserve E-Mountain Bike 2026
sku# 268769
Model Info
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Product Info
If you think e-bikes aren't for you because you're a "serious" rider, think again. The Santa Cruz Bullit 4 CC X0 AXS Reserve E-Mountain Bike crushes the steepest, rowdiest trails with a descent focused geometry that transforms "absolutely not" into "send it!" Powered by the super reliable Bosch Performance Line CX drive unit, this beast combines an aggressive Nomad-inspired chassis with four-bar suspension for maximum control when things get spicy. The wireless SRAM X0 Eagle AXS T-Type drivetrain and Maven Silver brakes handle technical terrain with confidence and precision, while 170mm of front and rear travel delivers downhill bike capability without the dual-crown commitment.
Product Details
Key Features
Carbon CC Frame – Santa Cruz's highest grade CC-level carbon frame is every bit as stiff and strong as their C-level frame, but weighs about 280 grams less, due to the use of lighter, stronger, and more expensive carbon fiber. Santa Cruz is also able to truly integrate shock mounts, pivot mounts, dropouts and disc brake tabs into the structure, using all uni-directional carbon plies. The shock mount isn't merely riveted or bonded on after curing, but is an integrated part of the fiber lay-up. This makes Santa Cruz's carbon frames incredibly strong and able to absorb impact better than any other frame they've tested.
Travel – 170mm Front / 170mm Rear
Wheel Size – Mixed Wheel (29" Front / 27.5" Rear)
Bosch Performance Line CX Drive Unit – The next generation Bosch Performance Line CX motor is quieter, lighter, and smaller than ever. More compact but no less powerful, it comes with a maximum torque of 85Nm. Choose between 4 standard modes and customize your ride in the Bosch Flow App.
Discreet Top Tube Display – The built-in display on the toptube allows for battery charge and mode to be displayed. The display can also be used to turn system on/off and toggle modes. More detail (% battery charge and range) can be found by using the app.
Independently Adjustable Geo and Progression Chips – The geo chip raises or lowers the bottom bracket 4mm, and adjusts the head tube angle by 0.3°. The progression chip changes the progression from 26-29%.
Tool Mount – Discreet mounting bolts underneath the top tube allows for clean, on-bike-storage of tools, tubes or an AirTag.
Specs
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Biking Type:
Mountain
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Biking Type
Mountain Mountain bikes are built for tackling rough terrain with frames made of durable materials like aluminum or carbon fiber, ensuring stability and maneuverability. They feature suspension to absorb impacts from rocks, roots, and drops, providing a smoother ride.
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Used For:
Enduro
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Used For
Enduro If you’re looking for maximum performance while flying down heavier trails, an enduro bike is for you. These bikes combine ample suspension travel (typically 150mm+) with descent-focused frame geometry and components that allow for reasonably efficient pedaling.
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Suspension:
Full Suspension
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Suspension
Full Suspension Engineered to tackle the most challenging terrain with enhanced comfort and control. Unlike hardtail bikes, full suspension bikes feature both front and rear suspension systems that allow the wheels to move independently from the frame.
- Gearing: 1 x 12
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Frame Material:
Carbon
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Frame Material
Carbon Carbon is a composite frame material. Unlike metals, carbon is composed of fibrous strands woven into a grid and bonded with epoxy. Carbon is favored by many for its lightness and stiffness but its complexity in fabrication makes it the most expensive option.
- Water Bottle Mounts: 1
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Fork:
Fox 38 Factory GRIP X2
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Fork
Fox 38 Factory GRIP X2 The Fox 38 is the hard hitting, long-travel enduro specialist. When you need to go really big, reach for the 38. Optimized for 160 - 180mm of travel and packing the same revolutionary feature set as the Fox 36, the 38 redefines what you think a long travel single crown fork is capable of, and sets a new benchmark for confidence, performance and durability.
"Factory" says it all — feature-packed and designed to exceed the demands of Factory-level riders. What we sell is what they race. Factory Series products feature slippery smooth, ultra-durable Genuine Kashima Coat.
This fork features the GRIP X2 damper for maximum adjustability: high- and low-speed compression adjustment, plus high- and low-speed rebound adjustment. - Stanchion Diameter (mm): 38
- Fork Travel (mm): 170
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Rear Shock:
Fox Float X2 Factory
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Rear Shock
Fox Float X2 Factory Combining ultra-plush coil-like comfort and incredible damping prowess with the light weight of an air spring and an unmatched level of tunability, the Float X2 brings new levels of control and performance to every terrain imaginable.
Factory Series models feature a genuine Kashima Coat finish for the ultimate friction-free performance.
Shock Adjustments - Air Spring Pressure / High and Low Speed Compression / High and Low Speed Rebound / 2-Position Lockout Lever - Rear Travel (mm): 170
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Drive Unit:
Bosch Performance Line CX BDU38
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Drive Unit
Bosch Performance Line CX BDU38 The next generation Bosch Performance Line CX motor is quieter, lighter, and smaller than ever. More compact but no less powerful, it comes with a maximum torque of 85Nm. Choose between 4 standard modes and customize your ride in the Bosch Flow App. -
Battery:
Bosch PowerTube 600Wh
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Battery
Bosch PowerTube 600Wh Thanks to their range, long service life, intelligent battery management system and easy handling, Bosch Power Tube lithium-ion batteries are among the most modern on the market. All those decades of Bosch experience has paid off! -
Shifters:
SRAM AXS Pod Bridge
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Shifters
SRAM AXS Pod Bridge The AXS Pod transforms the crucial act of rider inputs into a vastly more personal experience for all of your AXS controls. -
Rear Derailleur:
SRAM X0 Eagle AXS T-Type, 12-Speed
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Rear Derailleur
SRAM X0 Eagle AXS T-Type, 12-Speed Engineered as integrated and interdependent transmission components, the X0 Eagle T-Type derailleur mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless Interface. Beyond that, its Full Mount attachment method creates a far stronger connection that grips both sides of the frame. The new Transmission derailleurs feature the same intuitive pairing and set-up procedure as our Eagle AXS derailleurs. Featuring an overload clutch that boosts resiliency and a tucked-in profile that houses protection covers on the B-knuckle and outer link that are fully replaceable, or upgradeable to the XX skid plate. -
Crankset:
SRAM X0 Eagle AXS T-Type, 32t
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Crankset
SRAM X0 Eagle AXS T-Type, 32t X0 Eagle AXS Transmission Power Meter Crankset provides riders with accurate, live power data delivery housed in our most advanced aluminum crankset. The power meter technology is integrated through what we call “DUB-PWR” – a unique design that elegantly houses Quarq’s reliable and accurate power measurement inside the DUB crank spindle itself. Measuring left-side power to calculate total watts, it’s subtle, lightweight, compatible with any chainring setup, and boasts unbeatable battery life. It is also compatible with the Flight Attendant system, allowing for total connectivity between all AXS enabled components. No-compromise, no-fuss data delivery with robustness in mind.
FEATURES- Innovative DUB-PWR design allows for lightweight, subtle Quarq power integration.
- Compatible with Flight Attendant
- Unique, groundbreaking design integrated with the lightest aluminum crankset on the market.
- +/- 3% accuracy
- Long battery life (400+hours)
- User replaceable AAA lithium battery
- Waterproof (IPX7 waterproof to 1 meter for 30 minutes)
- 30-34T rings
- Can be run with chainring bash guards
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Cassette:
SRAM X0 Eagle T-Type XS-1295, 10-52t
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Cassette
SRAM X0 Eagle T-Type XS-1295, 10-52t The X0 Eagle Transmission (T-Type) Cassette is a major reason why Eagle Transmission offers the best-ever inboard and outboard shifting performance under load. Engineered as integrated and interdependent transmission components, the X0 Eagle Transmission Cassette and derailleur contact directly, ensuring perfect alignment on every bike. Beyond its unique and stunning Dark Polar finish and electroless nickel plating for incredible resistance to corrosion and wear, its full X-Sync design literally means the harder you pedal, the better it shifts. Its strength is further proven by its full approval for E-MTB use. It’s been built for a 55mm chainline for even more durability and precision thanks to milder chain angles throughout the full range, low to high. From its massive 520% gear range, the 52 tooth cog steps down with improved gear progression with 44 and 38 tooth cogs in the low end (compared to the Eagle drivetrain 10-52-tooth cassette). What else? It has a clearly marked Setup Cog, making install both simple and fool-proof.
FEATURES- Full X-SYNC for best-ever inboard and outboard shifting performance under load
- Optimized gear steps on low end
- 55mm chainline compatibility for more moderate chain angle, longer wear and greater precision
- Setup Cog for fool-proof set up
- Features X-DOME with a lighter aluminum 12th gear
- Fully E-MTB approved
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Chain:
SRAM X0 Eagle T-Type Flattop, 12-Speed
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Chain
SRAM X0 Eagle T-Type Flattop, 12-Speed With Eagle Transmission being the first of its kind, fully integrated and interdependent system, the X0 Eagle Transmission (T-Type) Flattop Chain is so much more than just a chain. Its unique flat top design makes it the strongest change chain we have ever made. With equal importance, it upgrades the look of any super machine. These details matter. It features a Dark Polar finish specific to X0, has been plated with electroless nickel, and comes with a PVD coating for unbelievable resistance to corrosion and wear. Fully approved for E-MTB use with solid pins.
FEATURES- Strongest SRAM chain ever
- Specifically engineered for Eagle Transmission
- Flattop profile, unbelievable shifting performance, game-changing aesthetics
- Pedals: Not Included
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Brake Levers:
SRAM Maven Silver
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Brake Levers
SRAM Maven Silver SRAM Maven Silver features monstrous 18 and 19.5mm pistons driving 50% more power than Code. But best-in-class power means nothing unless you’re able to harness it. The Maven Silver lever body houses Swinglink, which translates rider input for progressive power throughout the lever pull, maintaining SRAM’s signature ride feel. And because of a stiff 4-bolt caliper that sheds an incredible amount of heat, that feel remains consistent, so the last corner feels like the first corner. Maven Silver features a bold black anodized finish with stainless hardware. And for unrivaled ease of customization, features tool-free Reach and Contact Point Adjust. - Brake Calipers: SRAM Maven Silver
- Rotors: SRAM HS2 | 200mm Front & Rear
- Headset: Cane Creek 50 IS Integrated
- Stem: OneUp Stem, 42mm
- Saddle: WTB Silverado Medium Fusion, CroMo SL
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Seatpost:
OneUp Dropper
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Seatpost
OneUp Dropper Known for its no-nonsense smooth cable actuation, short overall length, and easy serviceability, the OneUp Dropper is a solid choice for dependable and customizable performance. - Hubs: DT Swiss 350
- Rims: Reserve 30|HD Front / 30|DH Rear
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Front Tire:
Maxxis Assegai 2.5" | 3C MaxxGrip, DoubleDown, TR
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Front Tire
Maxxis Assegai 2.5" | 3C MaxxGrip, DoubleDown, TR Greg Minnaar’s signature tire – the Maxxis Assegai – provides tenacious, predictable grip across the entire profile no matter the lean angle. The Assegai can be used front and rear for a surefooted feel or as a front paired with a faster rolling rear tire.- 3C MaxxGrip: The stickiest, slowest rebounding rubber Maxxis offers.
- DoubleDown (DD): Two layers of lightweight 120 TPI casing combined with a butyl sidewall insert creates a highly durable tire with more trail feedback than a Downhill casing tire.
- Tubeless Ready (TR): Tubeless tires allow riders to run lower air pressures for improved traction, lower rolling resistance, and less chance of flatting.
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Rear Tire:
Maxxis Minion DHR II 2.4" | 3C MaxxTerra, DoubleDown, TR
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Rear Tire
Maxxis Minion DHR II 2.4" | 3C MaxxTerra, DoubleDown, TR With side knobs borrowed from the legendary Minion DHF, but widened to provide more support, the DHR II corners like no other. The center tread features ramped leading edges to improve acceleration and sipes to create a smooth transition when leaning the bike. Paddle-like knobs on the center tread dig in under hard braking and help keep the bike under control.- 3C MaxxTerra: A triple compound ideal for trail riding in all conditions - offers more traction than 3C MaxxSpeed, yet provides better treadwear and less rolling resistance than 3C MaxxGrip.
- DoubleDown (DD): Two layers of lightweight 120 TPI casing combined with a butyl sidewall insert creates a highly durable tire with more trail feedback than a Downhill casing tire.
- Tubeless Ready (TR): Tubeless tires allow riders to run lower air pressures for improved traction, lower rolling resistance, and less chance of flatting.
- Warranty: Limited Lifetime (Frame and Bearings)
| Size | S | M | L | XL | XXL |
| Rider Height | 5''1" - 5'5" | 5''5" - 5'9" | 5'9" - 6'1" | 6'1" - 6'4" | 6'4" - 6'7" |
| Reach (mm) | 432 | 456 | 477 | 497 | 522 |
| Stack (mm) | 625 | 635 | 643 | 656 | 674 |
| Effective Top Tube (mm) | 572 | 597 | 618 | 641 | 671 |
| Seat Tube (mm) | 380 | 400 | 420 | 460 | 500 |
| Head Tube Angle (°) | 63.3 | 63.3 | 63.3 | 63.3 | 63.3 |
| Seat Tube Angle (°) | 77.1 | 77.1 | 77.1 | 77.1 | 77.1 |
| Chainstay Length (mm) | 441 | 444 | 447 | 450 | 453 |
| Bottom Bracket Height (mm) | 342 | 342 | 342 | 342 | 342 |
| Bottom Bracket Drop (mm) | 31 | 31 | 31 | 31 | 31 |
| Head Tube Length (mm) | 100 | 110 | 120 | 135 | 155 |
| Wheelbase (mm) | 1221 | 1253 | 1280 | 1310 | 1347 |
| Standover Height (mm) | 740 | 735 | 733 | 733 | 730 |
| Complete Weight (lbs) | 48.17 | ||||
| Complete Weight (kg) | 21.85 | ||||
| Wheel Size | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel |