Hi. I am a total newbie, looking at converting to, and building, an ebike. I live in a rural area and the closest shop is 25km or 16 miles ride. It has a total climb of around 450m (1475') but as the route has several up and down sections, the sum of all the climbs will be a lot more. I am wondering if there is a mobile app that will record the gradient data, as I drive the route, so I can then do the math to determine my best setup. I tried a few altimeter apps but they don't have sufficient granularity to be of any use. Most will only sample every 5 minutes or so. I realize that this might already be answered but, I haven't found the right search terms to deliver any answers.