There is no throttle on STEPs. Di2 is offered on a few STEPs bikes, especially in Europe.
Simano STEPS 250Watt mid drive motor
Shimano lithium Ion 12ah down tube battery
Shimano Alfine 8 with di2 electronic shifting
Premium alumimum frame with hydroformed tubes & polished welds
Removable handlebar mounted Shimano LCD display indicating battery life, level of assistance (eco, normal or high), range, time, odometer, button to operate front & rear lights, walk assist
Shimano Alfine high-grade hydraulic disc set, front & rear. 160 mm Shimano disc rotors
Double walled premium 27.5 alloy rims
Kenda Koast premium sport 27.5 tyre
Smart changer - 3 hour recharge time
Throttle and PAS
2 Year "full peace of mind" Warranty
- See more at:
http://electric-bike-store.co.uk/shop/product_info.php/cPath/23/products_id/5252#sthash.GfKC5EDG.dpuf