Senior VR Member
Join Date: Jul 2008
Location: Second Star to the right, then straight on till morning.
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With the Tow-Pac, you never really lean the bike over, but on the other hand, you really don't ride with BOTH wheels on the outriggers touching the tarmac either. It is more or less training wheels for a motorcycle, with will result in you having to steer through corners, more than anything else. A 185/70/15 or 195/65/15 car tire MIGHT fit, but there are a number of drawbacks, even with the Tow-Pac in place. The car tire introduces significant amount of sidewall flex by design, where a MC tire is nearly rigid (also by design). The corresponding suspension components including spring and damping rates are all built and calibrated to expect a certain performance from the tire. Changing that dynamic, changes the overall suspension and can cause handing issues, even with the outrigger. The other consideration is the contact patch and mechanical grip that each tire delivers. A MC has substantially better mechanical grip, especially on wet or slippery surfaces, when compared to a car tire. The car tire in intended to be used in concert with three other tires, all multiplying their grip into braking force. In other words, contrary to what dark-siders like to claim, a car tire actually delivers LESS grip than a MC tire.
If you are willing to accept those issues, then there is no reason to NOT explore it as an option. With the advent of the Spyder and other trike motorcycles, there are now motorcycle SPECIFIC "car tires" that can be purchased and fitted on your bike, which would really be the option I would choose if it were me making the decision.
Current Bikes -->
-1969 Indian MX125 -10-2009 to Present
-2014 Honda CTX1300 - 05-2015 to Present
Past Bikes ----->
-1973 Yamaha RD350
-1991 Harley Sportster 883 XL
-2000 Yamaha XV125
-2003 Piaggio Fly
-2004 Suzuki LS650 - 04-2005 to 07-2008
-2005 Boulevard C50 - 07-2008 to 5-2012
-2012 Vulcan 900 - 05-2012 to 05-2015
-2008 Yamaha FZ6 - 11-2008 to 04-2017
-2006 Star Virago - 05-2011 to 06-2017