http://www.mallorca312.com/recorrido_312
Yeah, I can understand the attraction if you're a hill-riding nutter. The mass of the main peleton blocking a junction at Soller was quite annoying for a minibus trying to get to Palma (and rather more than that for people trying to get flights), but the time estimates published on the website were really quite accurate. By 10:15, a few minutes before the 10:22 on the website, the queue of motorised traffic was beginning to move through the shared section.
If, after several years of the event happening, the tourist bus companies and the hotels can't get their act together to work around the event I'm afraid I've got little sympathy. It brings 6,500 riders to the island, off-season, for one day, and probably several thousand more at other times.
I won't tell you what the tour-guide said, especially since I was wearing one of my t-shirts with a bike on it...