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I rode 17km to a nearby mountain and then did an 18km ascent of it. Then I did about another 20km descent down the back side of the mountain.
That rear descent was a killer for the first 2km, the whole mountain has concrete roads and on the rear, north side, trucks and weather have stripped the concrete down to the aggregate and it's just pebbles and gravel, covered with a thin coating of mountain skree. It's basically a technical mtb track not a road. I was on a CX so it could have been worse. Plus it's way steeper than the front side, which meant I was riding my brakes, down a steep hill, on skree and spending half the time airborne due to pebbles and shit. I had to rest my hands at the end of that section.
The rest of the descent is gorgeous though and the roads get way better except for speed bumps that you have to bunny-hop.
62km in total, the mountain is a 700m climb.