Since the original Avial e-bike frame passed the CAD simulation for loads up to 140 kg, the bike itself was equipped with MTB components, including wide studded wheels with a diameter of 27.5 inches, taking into account the fact that the e-bike owner can go out of town and meet quite difficult passable roads on his journey, then after the first 30 km of the second prototype run along the city streets, it was decided to test its operational capabilities off-road.
According to the plan, off-road testing should take place in two stages. The first is rocky, pebbly and sandy roads with uneven terrain. Here, for 18 kilometers, no surprises were noted. An average drive power of 350W and a torque of 80Nm showed all their advantages, both when driving along winding bumpy paths, and on hilly terrain, and especially when steep uphill. The frame slightly absorbed the sharp jolts, and the front fork with a stroke of 100 mm provided sufficient comfort while driving. In the sand, with a competent dosage of revolutions, it was even possible to drift a little, without danger of stalling.
The second stage of testing was planned as mud stage. For the test the route intended for trips to ATV and cross-country motorcycles was selected. Its surface was a “plowed” road with many puddles and a rut with deep wet mud. When driving through relatively difficult areas of rough terrain, Avial e-bike showed good results, even passed through puddles with a soft bottom and of 20 cm deep. However, on the full off-road track, he still “pass out” and lost the chain that flew off because of the dirt stuck to the gearshift mechanism with stones and branches. In general, my e-bike in the conditions of mud dough proved to be if not a jeep, then a decent SUV.
The problem arose later. Since the mud test was carried out in several stages, the bike passed about 52 km during this time, at some point it turned out that the whole frame was covered with a thick layer of wet, and in some places already dry clay. There was a question: How to clean it all up? While I was thinking about it, the clay dried up, and the decision came, of course. Taking a rubber hammer in my hands, I began to gently tap on various parts of the frame. The dirt began to move away, literally like snake skin, and my e-bike finally acquired its original appearance after being washed with high pressure water.