Wheel Size and Ride Quality

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The wheel arc only has a certain amount of space (maximum outer diameter of wheel is limited). Here "wheel" = tyre + rim.

Now if you increase the size of the rim, the size of the sidewall of the tyre has to decrease i.e. lower tyre profile + bigger rim diameter.

If you decrease the size of the rim, the size of the sidewall can be increased i.e. higher tyre profile + smaller rim diameter.

A bigger tyre sidewall can flex more and absorb bumps better (increased cushioning) but it has an adverse affect on the handling since the tyre can deform more during hard cornering. So the tyre + rim combination needs to be selected carefully.

Chaning the overall diameter by upto 5 % is ok. Change it more and you start running into problems.

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Explained in detail by dtandon and I just want to add that basically the shorter the sidewall (tyre surface area between the wheel rim and the road) the less the rubber flexes which increased handling but reduces comfort as there is no rubber to cushion the impact.

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Many factors come into role when it

comes to tire size in relation to effects on fuel consumption. I will

do my best to explain the relationship.

In theory, a wide tire

will weigh more than a narrow one (if the tires height are the same).

Combine this with addition rolling friction created by the wide track

of the wider tire, and more fuel is needed to move the wide tire. In

most scenarios, the added fuel consumption will be marginal, and most

likely unmeasurable.

Taller tires (I know this was not part

of your question, but I will expand upon the issue), also suffer

similar effects. A taller tire weighs more, and thus requires more

fuel to get them moving. However, a taller tire also gives you a

higher over all gear ratio, lowering your RPM while driving. Given

this, it is hard to judge whether a taller tire will require more

fuel to turn or not.

The final variable to the issue of tire

size vs. fuel consumption is application. For example, a 4 cylinder

engine might suffer more from wider tires than a V-8, due to the

difference in torque. The stronger the engine, the less likely that a

small increase in load or rolling resistance is going to require more

fuel to operate.

For the final part of your question, energy

saving tires typically refers to a tire with a tread pattern or

material composition that has less rolling resistance than a typical

tire. Fuel savings will be marginal at best, again depending on the


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I hope this helps your question.If you

need some more help you get the information from


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