After a summer of fun and frustration with our Hybrid Bike Project we learned a few lessons along the way: 1 sprocket alignment is essential for a reliable engine installation so a machined hub adapter is a worthwhile choice. 2 Chain tension is also important and for this reason I highly recommend a good quality engine mounted spring loaded tension-er, 3 The L-Faster Left sided mounted 350 Watt 36 Volt motor is reliable and will do the job but is a tad noisy and a little under powered for this application and because of its freewheeling characteristic, it is not capable of Regen. 4 The front 48 volt 1000 Watts Direct Drive Hub motor is quiet and packs a big punch for negotiating steep grades and is capable of battery Regen while under Gas Powered conditions. 5 The Lithium ion 48 volt 14 amp-hours battery is capable of an hour plus peddle assist runs at -5 degrees temperature which matches my minimum comfort level. 6 Not all Controllers are capable of delivering the Regen feature your system is capable of so, it's important to choose one that states so in the description.