Features of the Tacx FLUX 2 Smart Bike Trainer Type of trainer: Interactive Smart direct drive with electric brake Magnets: 8 Permanent ferrite magnets & 8 electromagnets Transmission: None Electrical requirements: 100-230 Volt Power indicator: None Connection indicator: (ANT/BT) 2 LEDs FirmwAre upgradable: Yes Suitable cassettes: Not suitable for Specialized SCS system , Shimano & SRAM: 8 - 11 speed. Campagnolo, SRAM XD and XD-R body sold separately Suitable axles: Width of rear fork: Race 130 mm, MTB 135 mm, 142 mm & 148 mm. Adapter for 135 x 10 mm available. Suitable bikes: Race, Tri & MTB Supplied with: Quick release for road bikes and mountain bikes (5mm) , Direct drive quick release with adapter set 142x12mm & 148x12mm , 1 month Tacx Premium softwAre Specifications Max. power (40 km/h): 2000 Watt Max. incline: 16% Simulation of descent: No Max. torque: 41 Nm Max. brake force: 120 N Flywheel: Actual of 7.6 kg Mass inertia: 31.2kg Calibration: Spin down Footprint: (lxw) 670 x 642 mm (26.4 x 25.3 in) Height: 460 mm (18.1 in) Dimensions when folded: Not foldable Weight: 21.3kg (46.9lbs) Data output and Control Wireless communication: ANT+ FE-C , Bluetooth Smart open Control by: ANT+FE-C bike computers , Connect to computer via ANT+antenna , Smartphone , Stand alone , Tablet Output: Cadence , Power , Speed Read out on: Bike computer , Computer with ANT+ antenna , Smartphone , Sports watch , Tablet Accuracy: