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Old 05-04-2008, 09:24 PM   #1 (permalink)
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Default Size of wheels = stability?

Does a larger wheel diameter help with hwy stability? Say 14" vs 17"?

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Old 05-04-2008, 09:26 PM   #2 (permalink)
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In theory you'd have more gyro stability. Not sure how that manifests itself in practice. I will say that in 15 years of motorcycling and 8 of forum research I've never heard the subject come up.
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Old 05-04-2008, 09:31 PM   #3 (permalink)
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Looking at a scooter (Burgman) but the wheel diameter (14") at 70 mph has me concerned.
Rowdyred94, I knew I could count on you. So you feel it diameter shouldn't be a problem?
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Old 05-04-2008, 09:55 PM   #4 (permalink)
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ahhhh...so size DOES matter !
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Old 05-05-2008, 08:13 AM   #5 (permalink)
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No, it won't be a problem. Now that I know you're considering a Burgman, I say go for it. They're supposedly fantastic machines.
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Old 05-05-2008, 08:24 AM   #6 (permalink)
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The size of the wheel only affects the RPM at which the wheel spins at a given speed. A bigger wheel spins more slowly at 60mph than a smaller wheel. That's why you're only supposed to drag a U-haul trailer at 55mph or less, because they put those crappy little wheels on some of them. Well, that and they probably just don't want you driving 90 with their trailer even if it could handle it.

That said, you've got to go *really* small before you can't handle highway speeds well. Like I'd worry about an 8" wheel, or a skateboard wheel. A 14" wheel would be fine.

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Old 05-05-2008, 08:43 AM   #7 (permalink)
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If your interested in the maneuverability of a Burgman go to YouTube and do a search for "gershonbenfranja."

This guy has done a lot of videos some of which are very good at teaching techniques.
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Old 05-05-2008, 12:54 PM   #8 (permalink)
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The wheel diameter only effects stability if you get outside the design parameters. If put a larger or smaller wheel on a bike than it was designed for, you can really mess up handling and stability. For example, if you you go larger the front end usually gets pretty light, wanting to flop over at low speeds, as the increased axle hight off the ground changes the trail. That's why when chopper builders rake out the front end they usually go to smaller and smaller front wheels, to reduce the trail and compensate for the increased rake.
Usually you have fewer issues going smaller than stock. A popular mod is to take a big dual sport and put on smaller sportbike wheels, giving tremendous lean to carve up corners.
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Old 05-05-2008, 08:11 PM   #9 (permalink)
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i have noticed that a shorter fatter tire makes it feel more stable while riding. a taller skinny tire makes the steering feel more resonsive and a little more likely to what i call "crack track" and follow grooves and cracks in the road. therefor making it feel less stable. but both work great if they are what the bike was spec'd with.
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