Burley Dash Rack Mount Child Seat - Black/Grey Model=RIDE 60 Battery Mount BB Included No Chainline/Hub Compatibility keyword search-EB1390001M Crown:58HT Professional quality chain uses SA5139

Burley Dash Rack Mount Child Seat Black Grey Model=RIDE 60 Battery Mount BB Included No Chainline Hub Compatibility keyword search EB1390001M Crown:58HT Professional quality chain uses SA5139 BB Included No Chainline Hub Compatibility 130 Hubs Chainline Hub Compatibility 135 142 Road Disc Hubs > 415 mm Chainstay Chainring BCD 110 Color Black Crank Intended Use Road Crank Length (mm) 170 Defined Color Black Drivetrain Speeds 11 Number of Chainrings Double Pedal Spindle 9 16" Rings 34 50 Rings 50 34 Spindle Interface Type SRAM Truvativ GXP Weight 688 The reason for this is that the sole must be soft enough for classic skiing and so there is an appreciable loss of torsional control and power transmission