Hello everyone,
I've decided to post my experience with a car tire. I'll start first with some backgound:
I have a 2006 FJR with 140000km (87000 mi). I use it for daily transportation to work and for as many trips as my boss will allow. I bought the FJR as an all around do everything kinda bike with a sporty streak. It had to be reliable, fast, safe and above all fun. So far the bike has not let me down.
I've ridden with enough of you forum members to safely say that if we could, we would ride the slab with a Wing and the ride the twisties with a Ducati. But we can't, so that's why we compromised with the FJR. For me and many others, twisty riding is a very important aspect of FJR ownership. Go to any of the many rallies and you will find the routes are almost exclusively based around the best twisty roads. I'm a competent rider and like to be in the faster half of a group ride.
I have been going through at least 2 sets of tires/year since I bought the bike. After reading the reports and wanting to get better tire life I mounted up a Bridgestone Potenza grid tire. There was surprisingly little difference in feel between the bike and car tire especially under sedate use. To and from work, it was like I forgot it was a car tire. I kept the car tire on for over a year and rode it through every imaginable road surface. While I had the tire on, I kept trying to convince myself it was ok. I liked the fact that it was cheaper but I had to work SO hard in the twisties. Finally, this spring while riding twisties with my buddies I said enough is enough and I removed the csr tire and installed a set of PR3's.
It was like fireworks went off! I had forgotten why I bought the bike in the first place....FUN. My fun factor went up 10 fold. The bike rocked around corners like it was on rails. No more fighting the twisties, I was chewing them up and spitting them out. On that day I'd have paid anything for the fun I was having. That day I realized that the car tire had taken away the fun and wasn't worth the savings on tires.
Now the specifics:
On flat highways it's ok except for slanted cambers that you have to constantly fight.
Traction is always great
Tire life is fantastic
Uneven pavement when parking can make you drop the bike as the tire tips you from side to side.
It looks cool and always starts a conversation wherever you go.
The twisties suck! Yes it can do them, but it isn't fun. It is hard work. It's not bad on high speed sweepers that don't transition, but abyssmal in tight twisties that rock from side to side. As you lean the bike over, there is a "settling" spot that feels good. But in tight twisties there isn't time to find that settling spot and you are constantly "muscling" the bike around the corners. The front tire takes a lot more abuse with the car tire than without. Hanging off the bike helps, but not as much as you would get with the bike tire and still requires much more counter steer.
In conclusion: I would not recommend a car tire to anyone who likes to ride twisty roads. I put up with the flat roads so that I can have fun on the twisty roads, not the other way around. Remember why you bought this bike and realize you WILL be sacrificing fun for cost savings. For me it's not worth it.
Mike