When it came time to test Gravaa off-road, we took to the rough cobblestone section and compact sand track. Like the tarmac tests, we rode these surfaces in both directions, with different speeds and different tire pressures. The table below summarizes the results at 25 km/h, from which we can observe that:
Lowering tire pressure from 3.5 to 2.0 bar on cobblestones will give a benefit of 32 watts. On compact sand, the gain is (going from 2.5 to 1.1 bar) 49 watts.
Of course, these results are valid under the test conditions we created. Nevertheless, the impact of tire pressure is significant.
