I live near the original Sierra Nevada.
The tarmac goes up to 2250 metres, to a small car park. From there it is gravel and authorised motorised vehicles only. The ´track´ can be cycled up to 3398 metres. Did so 2019. Quite an experience as above said 2250 the air gets notably thinner when pushing pedals.
ICE suffer the same but (most) modern electronics adapt.
Have the same rear wheel dust only as there are may local hard pack tracks. I blow it off with the pressure washer at the local gas station. 1€ worth of spray time, wipe with the chamois and presto.