Whistle AXR C8.7: 29” Full Carbon e-MTB with Avinox M2S motor

The Whistle AXR C8.7 is a 29” full suspension e-MTB developed to tackle technical trails, challenging descents, and off-road routes with high-level outfitting. The carbon frame, long-travel suspension, Shimano XT Di2 electronic drivetrain, and 1300 W, 150 Nm Avinox motor system make it an electric mountain bike designed for those seeking performance, control, and technology.

Frame and Suspension

The Full Carbon Toray T700 frame is the base of the AXR C8.7, with a specific construction for 29” wheels and an integrated battery. The configuration is designed to offer stiffness, strength, and precise handling on the most demanding terrain.

• Frame: Full Carbon frame Toray T700, 29”, Integrated battery, Tapered, Internal routing, Rear travel 160 mm, 12x148 mm E-Thru, UDH hanger.

• Headset: FSA CRII Dual, 1.5”, Internal routing.

• Fork: RockShox ZEB RC eMTB, Debon Air+, 29”, Travel 170 mm, 1.5 Tapered, 15x110 mm.

• Shock: RockShox Super Deluxe, Debon Air Progressive, 230x65.

With 170 mm of front travel and 160 mm at the rear, the AXR C8.7 is designed to effectively absorb impacts and maintain high control even on the roughest trails.

Shimano XT Di2 12-speed Drivetrain

The Shimano electronic drivetrain offers precise and fast shifting, with a 12-speed configuration designed to effectively handle both climbs and fast sections.

• Derailleur: Shimano XT RD-M8250 SGS Di2, 12s.

• Shifters: Shimano Deore SW-M6250 Di2, 12s.

• Crankset: FSA CK745 165 mm, 36T MegaTooth.

• Cassette: Shimano CS-M6200, 12s, 10/51.

The combination of a 36-tooth chainring and a 10/51 cassette offers a wide range of gears, ideal for tackling steep climbs without sacrificing speed on faster sections.

Shimano XT Four-Piston Brakes

The braking system is designed to offer power and control even on the most challenging descents, thanks to Shimano XT four-piston calipers and large diameter rotors.

• Brakes: Shimano XT BR-M8220, Four piston.

• Rotors: Shimano SM-RT86, 203 mm front / 203 mm rear.

The 203/203 mm configuration is particularly suitable for a high-travel e-MTB, helping to maintain effective and controllable braking in the most demanding situations.

29” Wheels, Tubeless Ready Rims and Michelin Tires

The 29” wheels are paired with rims with a 30 mm channel and specific e-MTB tires, to ensure stability and grip on off-road terrain.

• Front Hub: Radiale J110, 15x110, International, 32h.

• Rear Hub: Radiale J148, 12x148, International, Microspline, 32h.

• Rims: Radiale W30, eDesign, Tubeless Ready, 622x30c.

• Tires: Michelin e-Wild Front&Rear Performance Line, 29"x2.60", Tubeless Ready.

• Wheel Diameter: 29”.

The 2.60” section of the Michelin e-Wild tires offers a wide contact surface with the ground, while the Tubeless Ready setup allows for a configuration oriented towards grip and control.

Cockpit and Components

The Whistle AXR C8.7's equipment is completed by aluminum components and a dropper seat post with remote control, particularly useful for quickly changing the rider's position during descents.

• Stem: Alu, Barbore 35 mm, Extension S-M frame 35 mm, L-XL 50 mm.

• Handlebar: Alu, 780 mm, Barbore 35 mm, Rise 15 mm.

• Seatpost: Dropper A1, Diameter 31.6 mm, remote.

• Saddle: Selle Royal SRX // Selle San Marco Zero.

• Pedals: Alu MTB Full +.

The 780 mm handlebar, with a 35 mm diameter and 15 mm rise, contributes to a stable position and good bike control on trails.

Avinox M2S Motor: 1300 W and 150 Nm

The electric assistance system is one of the distinguishing features of the AXR C8.7. The Avinox M2S motor combines compact dimensions with high performance, weighing only 2.6 kg.

• Motor: Avinox M2S, 2.6 kg.

• Max Power: 1300 W.

• Max Torque: 150 Nm.

• Rated Power: 250 W.

• Assistance Modes: Auto, Eco, Trail, Turbo, Boost.

• Max Speed: 25 km/h.

The five modes Auto, Eco, Trail, Turbo, and Boost allow assistance to be adapted to different riding conditions, from relaxed rides to climbs and technical sections that require maximum thrust.

Avinox 800 Wh Battery and DP100 Display

The battery integrated into the frame offers a capacity of 800 Wh, designed to support long e-MTB rides and fully exploit the performance of the Avinox system.

• Battery: Avinox 800 Wh (Fixed), weight 3.74 kg.

• Display: Avinox DP100.

• Charging: 2.5 hours, 12 A.

The fixed 800 Wh battery and the 12 A charging system, with an indicated charging time of 2.5 hours, complete the AXR C8.7's electrical system.

Weight and Available Sizes

The Whistle AXR C8.7 maintains a declared weight of 23.0 kg, considering the complete setup.

• Weight: 23.0 kg.

• Sizes: 40 - 44 - 48.

• Speeds [gears]: 12.

Availability in three sizes allows choosing the most suitable configuration for one's build and riding style.

Please Note

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

Whistle AXR C8.7: ready for the trail

Full Carbon Toray T700 frame, RockShox suspension, Shimano XT Di2 12-speed electronic drivetrain, Shimano XT four-piston brakes, 29” wheels, and Avinox M2S electric system with an 800 Wh battery: the Whistle AXR C8.7 combines comprehensive technical features in an e-MTB designed to tackle trails with confidence and high performance.

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.