Santa Cruz Bullit 4 CC XT Di2 Reserve E-Mountain Bike 2027
Model Info
Santa Cruz Bullit 4 CC XT Di2 Reserve E-Mountain Bike 2027
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Product Info
The Santa Cruz Bullit 4 CC XT Di2 Reserve E-Mountain Bike is as close as you can get to a downhill bike with a motor strapped in, featuring mixed wheels, 170mm of travel front and rear, premium CC carbon frame, and upgraded Reserve carbon wheels. The geometry is purpose-built for steep, consequential terrain, with flip chips that let you adjust head angle and shock rate independently so you can dial it precisely for the trail ahead. This isn't a trail bike trying to hang with the big boys, it's a gravity bike with a built-in shuttle. Finished with a heavy hitting Fox Podium fork up front, Fox DHX2 Factory Coil out back, and wireless Shimano XT Di2 shifting. Chef's kiss.
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.
Electronic Derailleurs Hardwired to Drive Unit
Mechanical Derailleur Routing
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 Podium
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Fork
Fox PodiumPodium is designed to be ridden like a downhill fork. No barriers. No hesitation. Complete confidence that your front wheel will hold the line, no matter how fast or how big you push it. All this while keeping your bike in a familiar range of travel and geometry in a single crown package.
- Stanchion Diameter (mm): 36
- Fork Travel (mm): 170
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Rear Shock:
Fox DHX2 Factory Coil
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Rear Shock
Fox DHX2 Factory Coil Nothing sticks to the ground quite like a coil shock. The DHX2 takes that sensation and buttresses it with sophisticated progressive damping, a massive overall tuning range, and super low-friction internals in order to capitalize on the full race-spec magic carpet experience. - 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:
Shimano XT Di2
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Shifters
Shimano XT Di2The Shimano XT Di2 shifter feels instantly natural out of the box, but can also be molded to fit any hand, thanks to its familiar fit and evolved adjustability design. Multiple shift modes, like hold-down multi-shift and 2-step multi-shift, offer versatility and precision, while the tactile click prevents mis-shifts and a tunable third button allows for additional system tuning or third-party connection.
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Rear Derailleur:
Shimano XT Di2, 12-Speed
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Rear Derailleur
Shimano XT Di2, 12-Speed Wireless Di2 shifting designed for E-MTB and HYPERGLIDE+. The ultra-durable RD-M8260 long-cage, 12-speed rear derailleur taps into proven wireless Di2 shifting technology and the strengths of other XT offerings, while pulling power from the bike's main battery, delivering a stable power supply, and eliminating the need for a back-up battery. - Crankset: e*thirteen Helix eSpec, 155mm
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Cassette:
Shimano XT M8100, 10-51t
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Cassette
Shimano XT M8100, 10-51t With its Beam Spider construction, the Deore XT M8100 cassette shaves weight while increasing Shimano's MTB gearing range another gear. Using a Micro Spline freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver advanced shifting performance.
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Chain:
Shimano XT M8100, 12-Speed
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Chain
Shimano XT M8100, 12-Speed The M8100 chain provides enhanced chain retention thanks to an extended portion of the inner plate. The chain features quick-link assembly and SIL-TEC treatment for extended offroad durability. - 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: Industry Nine A35, 40mm
- Saddle: WTB Silverado Medium Fusion, Stainless
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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 DEG DF
- 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) | 50 | ||||
| Complete Weight (kg) | 22.7 | ||||
| Wheel Size | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel |