I have built the bike with the plan to cycle back from Shoeburyness [southend] along the Thames cycle route approx. 40 -45 miles twists and turns, so I purchased the huge tri angle battery 36 v 27.5 ah after several test runs the longest 27 miles the battery is easily capable of the trip even on full level 9 but the problem came in the shape of a locked 5 bar gate .it goes uphill gives good speed overall I am pleased but I could not lift it over the …… gate so moral of the tale what looked good in the best laid plans steel frame alfine 8