avid bb7 disc avid speed dial bar clamp diameter bb7 disc brakes bh bicycle corporation bh easy motion bicycle-like electric experience bracket fsa road brake lever velcro brake levers brooks england crankset fsa gossamer derailleur sram x-7 easy motion easy motion usa electric bike electric bike company electric bike phenomenon features rear fender fsa road megaexo height w/ seat kg rider x-seam kg seat height levers avid speed local delivery options mirrycle rear view mm bb height** mm ground clearance mm seat angle mm seat width mm total height mm total length mm total width mm wheel track mm wheel base mm handlebars mm height mm bb height mount brake lever rear brakes rear derailleur sram rear fender flag rear rack rear view mirror rear wheel rider weight limit rider x-seam range sensor mount brake shifter crankset fsa shimano alivio rear shimano deore rear specifications bar clamp triple rear derailleur vintage electric