I wrote MTBR a couple times on this four or five years ago. They said, twice, they were going to implement a master map, which it seems to me they could do somewhat easily from all their data. In PA alone there are hundreds of trails but no way to figure out if you're near any of them!
I'm in London, UK for the summer. MTB is huge here but there is no riding in central London. With 300+ UK locations in MTBRs trail reviews there's got to be some close. But again, if I don't know the name of a small area or village I won't be finding them.
Just to add to these, there are also some quite tough single track trails in Greenland, MI.I think about 7 to 8 miles worth, maybe more now. East of the Porkies and South of Houghton/Hancock. About a mile from where I live. They do the Miner's Revenge bike race through them. Believe they added a small downhill course this year as well, maybe about a 2 minute descent?
If anyone is interested, you can get onto them from the Adventure Mining Co. Like I said though, they aren't your average bike trails and are quite tough.
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