I expect you'll find that a shutter speed of 1/200 will be enough to stop most vibration and/or subject movement. Faster would be better, of course but I wouldn't worry too much about aperature and depth of field. With the lenses you have, a setting around 10-15 feet should pretty much cover everything from infinity to "stealing your licence plate".
I think you'll find that the 18-55 mm lens, set at 30 mm or so and f8 at 1/250 sec, focused around 8-10 feet will give you the best results under most sunny, daytime conditions but the experiments will be a good excuse (if you need one) to do a lot of riding.
I'll be looking forward to seeing what you get and I'll be here if you need photo advice.