Quote:
Originally Posted by TexasCotton
You have stated several issues and now am lost and concern
Your terms quoted "skinny, tall, and large" just confuse and jade my perspective and not my understanding
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If you go for narrower tyres, the profile height needs to be increased to keep the same (or similar) tyre diameter.
185/65R15 stock :
You get the sidewall height by multiplying the width (which is in mm),
185,
by the profile height ,
65,
and divide by 100
This value should stay about the same on the alternative tyre.
So you'd need 175/70R15 to keep the diameter constant.
If you increase this value, the tyre will be bigger, do less revs, and so your engine will do less revs - good for fuel efficiency, but ... not always.
If you overdo it, it can actually hurt your FE.
Quite a few people here are running slightly taller tyres than specified by the car manufacturer - I'm one of them.
You can compare alternative tyre sizes here :
Tire Size Calculator - Tire & Wheel Plus Sizing
It'll also give you an idea wether there are any tires available in that size.
You must keep an eye on the tyre's load index.
Smaller tyres may have a lower load capacity than what's required for your car.
Make sure you stick with at least the same (or higher) load rating !