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Clare - are smaller car tires easier to balance than SUV tires?



 
 
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Old June 19th 19, 02:43 AM posted to rec.autos.tech
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Default Clare - are smaller car tires easier to balance than SUV tires?

On Monday, June 17, 2019 at 10:15:38 PM UTC-5, wrote:
> Xeno wrote: "
> At a given tyre pressure and vehicle mass, the wide and narrow tyres
> will have the same contact patch area. So no gain there. What does
> happen is that the contact patch becomes wider. A wide contact patch
> provides adequate cornering force at smaller slip angles but they reduce
> self aligning torque because of the reduced pneumatic trail. Therefore
> natural stbility and steering feel is commensurately reduced. There is a
> practical width of tyre for every vehicle but *cosmetic appearance*
> trumps this so people want the look of wider low profile tyres. There is
> also a section profile that is optimum for both ride comfort and
> handling allowing the tyre to form part of the *springing*. IIRC, this
> was about 70. at a section of 65, the ride gets more harsh and continues
> to do so the lower the section profile gets. "
>
> Agreed, and makes perfect sense!
>
> I'd say the lowest profile I'd go for is 65-series.
>
> Even if the contact patch for, say, a 70 and a 40
> series tire is approx. the same area, that patch should
> be parallel, not perpendicular, to direction of travel.
> That should be common sense, and flies in the face
> of all the aftermarket modders who want to throw
> 40-series bling 20" rims on a '85 Caprice or some such
> that was specifically engineered to work with 70-75-
> series tires and a specific rim diameter(typically 15 or
> 16") and width.
>
> By the way, the Sonata I drove that 'steered itself'
> exacerbated matters due to its 55-series tires on
> 17" rims - a Limited. Thing had a reasonable steering
> heft, yet somehow felt like driving on ICE, even on a
> dry highway on a sunny day. The steering wheel would
> slowly start tuggin to one side, and I'd start applying
> counter forcd, and then the steering wheel would snap
> quickly too far thr other way, causing the wander. It
> was a 'sticky' feeling, sort of.
>
>
> I wish I'd kept the car, and just had gone to the dealer
> to minus-size down to 60 or 65series tires on 16 or
> 15" rims. Combined with the reduced-assist Sport mode,
> the 'ghost' in the EPS would have been even less of an
> issue.


How about self balancing tires? innovativebalancing.com
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