Started prototyping with plus tires front and rear , really like plus in the rear , found that I climbed seated mostly and on the steep tech stuff the plus just hooked up so good out back . The plus always felt floaty and vague up front , tended to pinball off rocks etc , tried a 29 X 2.5 that I borrowed from one of the M29 team bikes and what a difference in steering precision / tracking, found I could actually weight the front wheel more in turns and it just hooked up great so decision made , the whole R&D team agreed.The extra weight , low bb / cg and getting the battery low and basically on underside of DT also helped handling. We use the Shimano E8000 removable battery that uses their stock lock key mount inside the DT access is super quick and easy through side door that has a simple latch system , takes a few seconds and no tools to switch out battery on the trail and still has a nice integrated look. You can change battery in or out of the bike. We like doing some longer "dual sport ' style rides carrying extra batteries in camelback. Designed suspension with bit more spring energy to make it feel lively and easy to pop off the ground , it jumps really well and stable.