Smaller tires

[bstone]

My OBW currently has 205/70R15 tires, but I want to put on the Michelin Energy Saver A/S tires, but they come only in 195/65R15. What would happen if I put these smaller tires on?

[plain OM]

Based on the size difference alone, I think there's both handling and "information" considerations.

In terms of handling, the Michelin is a narrower, and lower, tire. Being narrower doesn't necessarily mean less tread on the ground (this depends in part on the design), but it might be worthwhile checking the company websites (both) for their specs to compare with what you have now, and with the original tire for the car (if different).

The new tire is somewhat lower than the current one which could have a slight effect on ground clearance.

The smaller tire might have a different load capacity, as well as different speed and wear ratings. These should be considered taking into account how you use the car.

Information-wise, the smaller tire will rotate more revolutions per mile. This means the speedometer and odometers will read slightly higher than with the current tire. An estimate of the difference can be determined by calculating the circumferences (again from data on the company websites) or there are some on-line calculators that will do this for you.

The added rotation per mile could mean slightly more rapid wear, depending on driving style and wheel alignment.

The smaller tires would, of course, not present any problem in regard to clearances in the wheel well.

[woestracer]

The narrower tire might be a better drive in bad conditions as it is less prone to aquaplaning and much better in mud and snow. You should also check if your rims are not too wide for the smaller tire, this could cause problems like deflation when the tire deforms (hitting a stone/kerb).

[bstone]

Extremely useful information! Thank you!!!!!