I'm not sure what the original poster's intentions are or were, but I will say that it is definitely NOT for everybody. I'm quite used to riding with the car tire on my bike, both with and without the sidecar attached, but it is certainly different.
The downsides are:
[] increased countersteering pressure required as the bike tends to resist leaning a bit.
[] At slow speeds, the flat profile will unexpectedly lean into uneven surfaces, such as a driveway lip, a pot hole, or even a small rock.
[] Whilst maneuvering switchbacks, a bit more effort is required (similar to the countersteering above) to flip the bike from one lean to the next.
You do get used to each of these issues, but again, its all about personal preference.
The positives are as follows:
[] Dramatically increased traction for rear braking and accel.
[] Far superior traction in the rain, which we have quite a lot of up here in the NorthWest. I just moved from a summer tire to a wider "all season" tire and really like grip much better.
[] It's very unique, and always seems to stir folks up ... if you like that sort of thing.
[] Significantly increased tire wear life.
I would do it on any bike that I buy, mainly because I'm used to riding with them already. But that's just me. The main reason that I posted here was simply to clarify that it can indeed be done.
If you search the internet for "darkside" motorcycles you will find a sizable cult following of folks that have done this to their bikes.
But again, its not for everybody. If anyone does try it, you'll find that tire pressure is extremely important. You just have to try different pressures and see what works. I run with 30 psi. Most folks I know run in the 28-33 psi range. If you get the tire too ridged, the tire gets down right squirelly. Also, you have to get the tire a good scrubbing to rough it up, just like on a new MC tire. Finally, expect it to take about 100 miles or so before you are really used to the quirks of the tire. After about 500 miles you'll forget its even there until somebody mentions it.