Whistle AXR RA4.7 Electric Bike

Whistle AXR RA4.7: designed for maximum performance

The Whistle AXR RA4.7 is a 29" e-MTB designed to deliver high performance on off-road trails and the most demanding terrain. The Full Alu frame integrates the battery and features a Tapered headtube, internal cable routing, 160 mm rear travel, a 12x148 mm E-Thru thru-axle, and a UDH hanger.

The setup is completed by suspension with 160 mm of travel, a 12-speed Shimano Deore drivetrain, four-piston Shimano brakes, 29" Tubeless Ready wheels, and an Avinox electric system with an 800 Wh battery and high-performance M2 motor.

Technical specifications

Full Alu frame and trail geometry

The Whistle AXR RA4.7 frame is made of Full Alu and designed for 29-inch wheels. The battery is fully integrated into the frame, while the Tapered structure and Internal Routing system allow for a clean integration of components and cables.

The rear end offers 160 mm of travel and is equipped with a 12x148 mm E-Thru thru-axle and a UDH hanger. The headtube is a 1.5" FSA CRII Dual with Internal Routing, integrated into the frame configuration.

160 mm suspension

At the front is a Suntour XCR 36X eMTB Air R specific for 29" wheels, with 160 mm of Travel, a 1.5 Tapered steerer tube, and a 15x110 mm thru-axle.

The rear suspension system uses a RockShox Deluxe Debon Air 230x65, paired with the frame's 160 mm of travel. The combination of fork and shock is designed to offer a setup suitable for trail riding and MTB routes characterized by uneven terrain and technical sections.

Avinox M2 Motor: 1300 W and 150 Nm

The Whistle AXR RA4.7 electric assistance system is powered by the Avinox M2 motor, weighing 2.6 kg. The motor reaches a maximum power of 1300 W and a maximum torque of 150 Nm, while the nominal power is 250 W.

The Avinox system offers several assistance modes designed to adapt the e-MTB's behavior to different riding conditions. The Auto, Eco, Trail, Turbo, and Boost modes are available, allowing you to choose the level of support based on the route and riding needs.

The maximum assistance speed is 25 km/h.

800 Wh Avinox battery and DP100 display

The Whistle AXR RA4.7 is equipped with an 800 Wh Avinox battery (Fixed), integrated into the frame, weighing 3.74 kg. The battery capacity is designed to support the Avinox M2 motor system and the various available assistance modes.

The electrical system is completed by the Avinox DP100 display, which serves as the interface for managing and controlling the electric assistance.

Shimano Deore 12-speed transmission

The transmission is powered by a Shimano Deore 12-speed group set. The rear derailleur is a Shimano Deore RD-M6200 SGS Shadow Plus, 12s, while the handlebar controls are Shimano Deore SL-M6200 Rapidfire-Plus, 12s.

The crankset is an FSA CK745 165 mm with 36T MegaTooth chainring. The cassette is a Shimano CS-M6200 12-speed with 10/51 ratios, offering a wide gear range to tackle both climbs and faster sections of MTB trails.

Four-piston Shimano brakes

For braking, the Whistle AXR RA4.7 uses a four-piston Shimano BR-MT520 system, paired with 203 mm SM-RT66 rotors front and rear.

The four-piston setup and 203 mm discs are paired with the e-MTB platform and the available 160 mm of travel.

29" Tubeless Ready Wheels

The bike features 29-inch wheels with Radiale W30 eDesign Tubeless Ready rims in 622x30c size.

The front hub is a Radiale J110 15x110 mm, International, 32h, while the rear hub is a Radiale J148 12x148 mm, International, Microspline, 32h.

The tires are Schwalbe Nobby Nic Performance Addix 29"x2.60", a combination designed for MTB use and to offer a wide contact patch on the terrain.

Aluminum cockpit and dropper post

The Whistle AXR RA4.7 uses an aluminum stem with 35 mm Barbore. The Extension is 35 mm for sizes S-M and 50 mm for sizes L-XL.

The handlebars are made of aluminum, have a width of 780 mm, 35 mm Barbore and 15 mm Rise.

For saddle height adjustment while riding, there is a Dropper A1 dropper seatpost, with a diameter of 31.6 mm and remote control.

The saddle is a Selle Royal SRX / Selle San Marco Zero, while the equipment also includes Alu MTB Full + pedals.

Weight, sizes and configuration

The Whistle AXR RA4.7 has a weight of 26 kg and is available in sizes 40, 44 and 48. The bike uses 29-inch wheels and a 12-speed drivetrain.

The combination of an aluminum frame, 160 mm suspension, 29" wheels, 2.60" tires, Shimano Deore drivetrain and Avinox electric system defines a complete configuration for MTB and trail use.

Please Note

Technical specifications may change without notice depending on component availability.
Product images are for illustrative purposes only and may not perfectly reflect the described features.

An e-MTB designed for trail riding

The Whistle AXR RA4.7 combines a 29" platform with 160 mm rear travel, 160 mm Suntour XCR 36X eMTB front fork, RockShox Deluxe Debon Air shock, Shimano Deore 12s drivetrain, Shimano BR-MT520 four-piston brakes and an Avinox M2 1300 W and 150 Nm electric system, powered by an integrated 800 Wh battery.

A complete configuration for those looking for a 29-inch e-MTB with ample travel, trail-specific components and a high-performance electric assistance system.

Do you want to receive your bike ready for use? Don't forget to add the bike assembly service at the time of purchase! Discover all the details here: Francesconi bike assembly

A Complete Guide to Bike Sizes

Foreword: Not all bike sizes are the same

Each type of bike has a specific frame and often uses a different size scale. For example, a road bike with a 54cm frame might be considered a medium size by one brand, but a large by another.

Bicycle adjustment margins

Some types of bikes, like gravel bikes, offer a wide range of adjustments, adapting to different body types. Other models, however, have limitations in this regard. This is an important aspect to consider.

How to use size charts

We've created a simple guide to help you find the right bike size:

1. Check out our size charts for each bike type.
2. Learn more with specific tips to help you make the right choice.

Size Charts: Find Your Perfect Bike

Gravel and road bikes

Sizes are based on the length of the top tube (in cm), which determines the reach of the bike.

For gravel, measurements may vary slightly due to different geometries, but remain similar.

Mountain bike

MTBs are measured in inches, based on the seat tube.

Sizes also vary depending on the type of MTB: full-suspension , hardtail or fat bike .

Children's bikes

The size depends on the size of the wheels, often associated with age:

What to do with half measures?

If you are between two sizes:

• Comfort : Choose the larger size.
• Performance : Go for the smaller size.

Final tips for choosing

1. Consult the manufacturer's instructions : Always check the brand's guidelines.
2. Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
3. Test the bike : If possible, test the model you intend to purchase.