Detroit is the worst city in the USA for Biking.
There roads are terrible because of the potholes and segamented pavement. The Route from Detroit to Port Huron is nice only when you get to New Baltimore.
SMART the local bus system now has bike racks. Should you find yourself in Detroit DO NOT RIDE IN DETROIT!
From the South-SMART 830 Trenton Bus
From the West Westland 250 & Livonia 810
From Pontiac-Bus 450 or Amtrak(Check with Conducter Bribe him if you have to)
From New Baltimore enroute to Port Huron SMART 560
Buses are often without Air Condtioning and it is considered a CRIME To NOT HAVE A CAR in the moter city. In the last 2 days I have been stopped a total of 3 times for being a suspisios person