It's 7.25 miles long and yes,it's appropriate for cyclists
I agree with the above, and if by serious you mean longer distance, at the northern terminus you can jump around to Van Dyke Road and restart and connect to the Sunhine trail for alot more miles.
Yes. It's appropriate for cyclists, but not too serious. You have to be willing to slow down and share it politely with many pedestrians, including families with children and the elderly. Many cyclist use this trail obnoxiously, as though other users are intruders. Not cool.
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