For folks in the SF Bay Area, try a freshly paved Pleasant Hill Rd/Taylor Way descent coming down from Lafayette into Pleasant Hill. It's about a 1/2 continuous descent with a 35 mph curve at the base where it goes flat. Top speed for this heavy Clyde was 63mph. I still can hit regularly 59 mph on this and pass up cars on the way down. Best time to go down is about 3 weeks after a fresh layer of steam-rolled asphalt gets laid (every 5 years or so). Not recommended after a slurry seal and gravel gets laid (more often in the in between years). And riding in the bike lane is NOT recommended. Own the main road, since the side may have a bunch of debris. I used to ride this a lot doing my Berkeley-Concord commute taking BART in the mornings and riding home in the afternoons.