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car tires on motorcycles.
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  (#1)
whoa preppy......
 
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car tires on motorcycles. - July 24, 2008, 11:28 PM

My father in law informed me he was going to buy a car tire for his motorcycle. His Rocket III chews up the 240 rear tire every 4000 miles. Metzler wants 2 bills for a new one.
800lbs of bike plus 165 ftlbs of torque = limited tire life. His bike has a full exhaust and power commander (reason for the difference over stock Trq)

I wasn't warm to the idea at all. I thought it was hugely bad. Naturally, he shrugged me off and bought a car tire anyway and I took the wheel down to the shop for him to have it fitted. The replacement tire is a Riken 225/50/R16.
It's flat. Just like a car tire.





I rode it for about 30 minutes and was shocked. It leans just as it did stock (which is to say, poorly heh) the difference is riding straight on a slightly crowned road. The bike feels like it creeps a little side to side. If you've ever ridden a bike with a side car, it's a lot like that.

I'm still on the fence about it. I mean, he's not exactly canyon strafing with this thing, and he will get about 40,000 miles out of it vs. 4000, and $80 vs. 200 is pretty sweet. Something to me says it's a bad move.

what do you think?


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  (#2)
whoa preppy......
 
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July 24, 2008, 11:30 PM

here's the full sized pic

http://farm4.static.flickr.com/3180/...fecf724d_o.jpg


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B
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July 24, 2008, 11:48 PM

It's too good to be true.


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July 25, 2008, 06:06 AM

I have read many threads on that before. They call it "going to the darkside". Seems common on Valkyrie and Goldwings.
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Street Bonk Bum.....
 
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July 25, 2008, 06:09 AM

did your pops just recently see the new batman movie (bike with the super wide lookin car tires)?? LOL
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July 25, 2008, 06:33 AM

99% of bikes I see with car tires look crappy. There are a few ones that rock. Looking now.
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July 25, 2008, 08:13 AM


i had never heard of this. it seems like an awesome idea if you dont sacrifice much from a riding/comfort/stability stand point.


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July 25, 2008, 08:17 AM

I would be concerned about the lower static friction coefficient of the harder automotive tire as compared with a motorcycle-specific tire. That combined with the fact that geometry doesn't lie. He's got tiny contact patches in a lean. Longer wear = good. Increased risk of a slide = bad.

Ultimately depends on whether he can baby it in turns or not. Tell him to watch his left turns at intersections.


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Kat
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July 25, 2008, 08:28 AM

Quote:
Originally Posted by OrangeShirtDude
I would be concerned about the lower static friction coefficient of the harder automotive tire as compared with a motorcycle-specific tire. That combined with the fact that geometry doesn't lie. He's got tiny contact patches in a lean. Longer wear = good. Increased risk of a slide = bad.

Ultimately depends on whether he can baby it in turns or not. Tell him to watch his left turns at intersections.
What he said. Also, since cars don't lean into turns, I'd expect faster wear on the tire edges than if it were a car. The edges of the tire weren't designed to lean into turns.


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  (#10)
whoa preppy......
 
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July 25, 2008, 08:30 AM

heh. the rocket wasn't exactly designed to lean in turns.


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  (#11)
This Ain't My First Time!
 
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July 25, 2008, 08:52 AM

Straight up and down I figure would be fine. I would just be concerned with leans. He he is not leaning the bike aggresively in turns I would not worry about it too much at all. This is a good topic for discussion however.

Also I am not sure if a car tire is designed to heat up like a motorcycle tire, so in this instance I would be concerned about the tire when leaned over.

Plesae let us know how things work out in 3 or 4 month intervals over the life of the tire. I think that would be interesting.


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July 25, 2008, 09:16 AM

This comes up pretty regularly on the Victory and other cruiser forums. People swear it doesn't negatively affect the handling but most cruisers riders don't know how to ride so I wouldn't put to much faith in their opinions.

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July 25, 2008, 09:33 AM

Does he use a car wheel with an offset or his stock rim?
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got barrier?
 
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July 25, 2008, 09:37 AM

should have gone with a skinner tire and put some stretch on that thing.


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  (#15)
whoa preppy......
 
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July 25, 2008, 09:41 AM

Quote:
Originally Posted by Cutter
Does he use a car wheel with an offset or his stock rim?

Stock rim.


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