Dartmoor Sparrow Mullet 27.5/29" is a modern Mullet MTB bike with a 130 mm air fork and 1x10 drivetrain for trails, singletrack and all-day mountain riding

MTB Bike – Key Features:

• Frame: Dartmoor Sparrow Mullet Aluminium 6061-T6
• Wheel size: 29" front / 27.5" rear (Mullet)
• Fork: X-Fusion RC32 Boost Air 130 mm
• Drivetrain: Microshift Advent X 1x10 with 11-48T cassette
• Brakes: Shimano MT-201 hydraulic disc brakes
• Rims: Dartmoor Raptor Tubeless Ready
• Tyres: Vee Tire Crown Gem
• Skill level: Beginner / Intermediate

The Dartmoor Sparrow Mullet 27.5/29" is built for riders looking for a capable trail bike that is easy to ride, confidence inspiring and ready for real off-road adventures. The Mullet wheel setup combines a large 29" front wheel with a nimble 27.5" rear wheel, giving you excellent stability without sacrificing agility.

Whether you are exploring forest trails, riding flowing singletrack or improving your skills on technical terrain, Sparrow Mullet delivers a balanced ride with predictable handling. The X-Fusion RC32 Boost Air fork, Microshift Advent X 1x10 drivetrain and Shimano hydraulic brakes work together to give you reliable performance wherever the trail takes you.

Why choose the Dartmoor Sparrow Mullet?

If you want one bike that feels comfortable on long rides while giving you the confidence to tackle more technical trails, the Sparrow Mullet is an excellent choice. Its modern geometry helps keep the bike stable at higher speeds while remaining responsive through tight corners and technical sections.

The 130 mm air suspension smooths out roots, rocks and rough terrain, while the wide-range 1x10 drivetrain makes climbing easier without adding unnecessary complexity. Powerful Shimano hydraulic brakes provide consistent stopping performance in dry and wet conditions, giving you better control throughout every ride.

Who is this bike for?

The Dartmoor Sparrow Mullet is ideal for riders entering the world of mountain biking as well as those looking to upgrade to a modern trail bike with a Mullet wheel configuration. It performs equally well on woodland trails, natural singletrack, bike parks and everyday off-road adventures.

Its balanced handling makes it suitable for riders who want a bike that is forgiving enough to build confidence while still offering the performance needed to progress their riding skills.

Frame size guide

• Size M: Recommended rider height approximately 160–175 cm
• Size L: Recommended rider height approximately 175–185 cm

These recommendations are intended as a general guide. Your ideal frame size also depends on your body proportions, inseam length and preferred riding position. A smaller frame offers quicker handling, while a larger frame provides additional stability on faster terrain.

What is a Mullet MTB bike?

A Mullet bike combines two different wheel sizes to deliver the best characteristics of both. The larger 29" front wheel rolls over rocks, roots and rough terrain more easily while providing extra grip and stability. The smaller 27.5" rear wheel keeps the bike agile, making it easier to corner, change direction and move around on technical trails.

This combination has become one of the most popular setups in modern trail riding because it delivers confidence on descents without compromising the playful feel many riders enjoy.

Modern geometry for confident trail riding

The Sparrow Mullet frame has been designed specifically around its mixed-wheel platform. A 66° head tube angle improves confidence on steeper descents, while the effective 75° seat tube angle places you in an efficient climbing position for better power transfer on long ascents.

With a 440 mm reach in size M and 470 mm in size L, the bike offers a comfortable riding position with enough room to stay balanced on technical terrain while maintaining excellent control at speed.

X-Fusion RC32 Boost Air suspension fork

The X-Fusion RC32 Boost Air fork delivers 130 mm of travel to absorb bumps, roots and rocky sections with confidence. Its air spring allows quick pressure adjustment to match your weight and riding style, while compression and rebound adjustment let you fine tune the suspension for different trail conditions.

A 15 mm Boost thru axle increases front-end stiffness for more precise steering and improved confidence when riding fast through rough terrain.

Microshift Advent X 1x10 drivetrain for climbing and fast trail riding

The Dartmoor Sparrow Mullet comes equipped with a Microshift Advent X 1x10 drivetrain paired with an 11-48T cassette. This wide gear range makes steep climbs easier while still providing enough gearing for fast sections and flowing descents.

A single chainring setup is easier to operate and requires less maintenance than traditional front derailleur systems. With fewer components to think about, you can stay focused on the trail ahead.

Reliable Shimano hydraulic disc brakes

Shimano MT-201 hydraulic disc brakes with 180 mm rotors deliver reliable stopping power and excellent control in a wide range of riding conditions. Whether you are descending technical trails or riding through wet woodland sections, you can brake with confidence and precision.

Tubeless Ready wheels built for modern trail riding

Dartmoor Raptor rims are Tubeless Ready, allowing you to convert the wheels to a tubeless setup in the future. Running lower tyre pressures improves grip, comfort and control while reducing the risk of pinch flats on rough terrain.

Vee Tire Crown Gem tyres provide dependable traction on loose dirt, rocks and roots, helping you stay in control throughout every ride.

Ride protected on every trail

Mountain biking is more enjoyable when you are properly protected. Before your first ride, check out our selection of MTB helmets and protective gear for extra confidence on the trail.

Dartmoor Sparrow Mullet 27.5/29" specifications

• Frame: Dartmoor Sparrow Mullet | Aluminium 6061-T6 | Hydroformed | two sizes: M and L | axle spacing: 135 x 10 mm | full geometry below
• Fork: X-Fusion RC32 Boost Air | 29" | Air spring | travel: 130mm | 15mm Boost thru axle | compression and rebound adjustment
• Handlebar: Dartmoor Tornado Low | Aluminium | width: 780mm | diameter: 31.8mm
• Stem: Dartmoor Viper | Aluminium | Short | 31.8 mm
• Headset: Dartmoor Blink | sealed bearings | IS42/IS52
• Rims: Dartmoor Raptor | front 29" / rear 27.5" | 32H | inner width: 30mm | Tubeless Ready
• Front tyre: Vee Tire Crown Gem 29" x 2.3"
• Rear tyre: Vee Tire Crown Gem 27.5" x 2.35"
• Crankset: FSA Gamma Pro | 170mm (M) / 175mm (L)
• Bottom bracket: BSA/Euro 73
• Chainring: 30T | BCD 82mm
• Front hub: Dartmoor Reel Boost | aluminium | sealed bearings | axle: 110 x 15mm Boost | 32H
• Rear hub: Cassette | aluminium | sealed bearings | axle: 135 x 10mm QR | 32H
• Cassette: Microshift CS-H104 | 11-48T
• Rear derailleur: Microshift AdventX RD-M6205GM | 1x10
• Shifter: Microshift AdventX SL-M9605-R | 10-speed
• Chain: KMC X10
• Brakes: Shimano MT-201 | hydraulic | dual-piston | rotor diameter: 180mm
• Saddle: Dartmoor Ferns | Railed
• Seatpost: aluminium | 30.9x400mm (L) / 350mm (M)
• Grips: Dartmoor Maze Lite
• Pedals: Dartmoor Vibe
• Weight: 13.60 kg

FAQ

Important information before your first ride

Please remember that this bike, like all performance bicycles, is exposed to significant loads during riding. No bike is indestructible, and every component can become damaged or worn during normal use. Regular servicing and routine inspections will help keep your bike safe and extend its lifespan.

Important information about your new bike

• Read the warranty documentation supplied with your bike before your first ride.
• Bikes ordered online are delivered approximately 90% assembled for safe transportation.
• Before riding you must install the pedals, straighten and tighten the handlebars, and on some models install the front wheel.
• The manufacturer recommends a pre-delivery inspection, often called the first service or zero service, at a professional bicycle workshop. This service is chargeable and is required to keep the manufacturer's warranty valid. Keep your service receipt.
• To activate the manufacturer's two-year warranty, register your purchase following the manufacturer's instructions. Proof of the first service is required during registration.

Manufacturer's disclaimer

If a warranty claim is accepted, the manufacturer and seller reserve the right to replace the claimed product or component with an equivalent technical replacement if the original part is no longer available, for example because it has been discontinued. The replacement part may differ in appearance or construction while maintaining the intended performance and functionality.