Bonzai Spear12 XC MTB
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Bonzai Spear12 XC mtb is a triple-butted lightweight, race-ready cross-country MTB built for speed and precision. With a triple-butted alloy frame, 120mm air suspension, Shimano Deore 1×12 drivetrain, and an optional dropper seatpost (125mm travel), it’s ready to tackle climbs, descents, and technical trails with confidence.
Engineered for riders who demand speed, control, and efficiency on every trail. Designed as a true cross-country race machine, it blends lightweight construction with modern trail-ready capability to deliver a fast yet confident riding experience.
Rolling on tubeless-ready double-wall rims with Maxxis Rekon Race 29×2.25 tyres, the Spear12 XC offers excellent grip, low rolling resistance, and race-day efficiency. The Boost hub spacing further enhances wheel stiffness and overall ride performance.
With a carefully tuned XC geometry, wide 760mm handlebar, and performance focused components throughout, the Bonzai Spear12 XC delivers the perfect balance of speed, comfort, and control—now enhanced with the added versatility of a premium dropper seatpost.
Product details
Overview & Features
At a glance
- Frame
- Triple butted AL6061, Tapered headtube, dropper post ready, Boost 148x12mm O.L.D
- Fork
- SR Suntour SF27-XCM32-Air Boost RLR, 120mm travel, Remote lockout with rebound adjustment
- Rear Derailleur
- Shimano Deore RD-M6100-SGS rear derailleur
- Tyres
- Maxxis Rekon Race 29x2.25, Black, 60tpi
Bonzai Spear12 XC mtb is a triple-butted lightweight, race-ready cross-country MTB built for speed and precision. With a triple-butted alloy frame, 120mm air suspension, Shimano Deore 1×12 drivetrain, and an optional dropper seatpost (125mm travel), it’s ready to tackle climbs, descents, and technical trails with confidence.
Engineered for riders who demand speed, control, and efficiency on every trail. Designed as a true cross-country race machine, it blends lightweight construction with modern trail-ready capability to deliver a fast yet confident riding experience.
Rolling on tubeless-ready double-wall rims with Maxxis Rekon Race 29×2.25 tyres , the Spear12 XC offers excellent grip, low rolling resistance, and race-day efficiency. The Boost hub spacing further enhances wheel stiffness and overall ride performance.
With a carefully tuned XC geometry, wide 760mm handlebar, and performance focused components throughout, the Bonzai Spear12 XC delivers the perfect balance of speed, comfort, and control—now enhanced with the added versatility of a premium dropper seatpost.
Key features
- Ultra-Light 6061 Alloy Frame – Triple-butted construction
- Boost Thru-Axle (148x12) for stiffness and control
- 120mm Air Suspension with remote lockout & rebound adjustment
- Shimano Deore 1x12 drivetrain (10–51T)
- Tubeless Ready wheels for better performance
- Maxxis Rekon Race tyres for XC speed & grip
- Hydraulic disc brakes for reliable stopping power
- XC Enthusiasts & Racers
- Riders Seeking Modern MTB Standards
- Riders Upgrading from Entry-Level MTBs
- Weekend Warriors to Aspiring Competitors
- Technical Trail Riders
- Built for riders who push limits – from weekend trails to competitive XC racing.
Technical Specifications
Frame & Fork
- Frame
- Triple butted AL6061, Tapered headtube, dropper post ready, Boost 148x12mm O.L.D
- Fork
- SR Suntour SF27-XCM32-Air Boost RLR, 120mm travel, Remote lockout with rebound adjustment
- Headset
- Sealed Bearing, SMR (Smart Cable Routing)
Wheels & Tyres
- Chainwheel
- Shimano MT510 crankset (32T)
- Rims
- Tubeless Ready Rim
- Front Hub
- Solon Sealed Bearing thru axle hubs, 32h, 110x15 mm
- Rear Hub
- Solon Sealed Bearing thru axle hubs, 32h, 148x12 mm
- Tyres
- Maxxis Rekon Race 29x2.25, Black, 60tpi
Drivetrain & Gearing
- Shifters
- Shimano Deore SL-M6100-R (1x12-speed)
- Rear Derailleur
- Shimano Deore RD-M6100-SGS rear derailleur
- Cassette
- Shimano Deore 10–51T cassette
- Bottom Bracket
- Shimano MT501B
- Chain
- KMC X12
Brakes
- Brake Set
- Tektro HD-M275 hydraulic brakes, 180mm front rotor / 160mm rear rotor
Handlebar, Stem & Saddle
- Handlebar & Stem
- 760mm alloy handlebar, 30mm rise, 9°backsweep, Forged alloy stem (60mm)
- SeatPost
- Alloy seatpost (30.9mm, 350mm)
- Saddle
- Velo VL-1C22
- Pedals
- Standard Included
Sizing & Fit
Available sizes
L - with Dropper Post, L - without Dropper Post, M - with Dropper Post, M - without Dropper Post
Sizing details
- 5'5" - 5'10"
- 31" - 33"
- 5'10" - 6'2"
- 33" - 35"
Fit guidance
Size · Rider Height · Inseam
M · 165 - 177 cm · 79 - 83 cm
L · 177 - 188 cm · 84 - 89 cm
Geometry · M · L
Frame size letter · M · L
Wheel size · 29" · 29"
A — Seat tube · 420 · 460
B — Seat tube angle · 71.5° · 72.5°
Effective seat tube angle · 74.3° · 74.3°
C — Head tube length · 90 · 90
D — Head angle · 67.0° · 67.0°
E — Effective top tube · 598 · 628
F — Bottom bracket height · 309 · 309
G — Bottom bracket drop · 64 · 64
H — Chainstay length · 430 · 435
I — Offset · 43 · 43
K — Wheelbase · 1135 · 1171
L — Standover · 749 · 763
M — Frame reach · 430 · 460
N — Frame stack · 614 · 614
Warranty & Support
The supplied Bonzai policy covers bike frames and non-suspension forks only. It lists ten years for alloy frames and five years for carbon, steel and dual-suspension frames; the applicable term for this bike depends on its verified frame construction. Paint, stickers and listed wear items are excluded, and original ownership, registration and authorised purchase are required.
Coverage depends on frame material and the conditions below. The supplied document lists modification and abnormal-use clauses under “Warranty is valid only for”; please confirm those clauses with Yellow Jersey before relying on them. For warranty support on Bonzai Spear12 XC MTB, contact Yellow Jersey with your original proof of purchase. Coverage is subject to the applicable product, ownership, registration and regional conditions; normal wear, misuse and accidental damage are excluded where stated in the full policy.
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