Skip the auto shop - Our mechanics make house calls

Q: Tire interchange

asked by on

I currently have r205/70 r15 tires and I was just given new r205/60 r15....will these work?

My car has 128 miles.
My car has an automatic transmission.

A: No, the most important thing when changing ...

No, the most important thing when changing tire or wheel size, is to keep the overall diameter the same. 205/70/15 is 26.3 inches and 205/60/15 is 24.7 inches. When you change the diameter, the final drive gear ratio is changed. This will affect the speedometer accuracy and how the transmission shifts. This also affects ground clearance, yours will be lowered by about 3/4 of an inch. In PA, and possibly in other states, it will not pass the inspection with a size that is smaller than original. Stay with the recommended size.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Rear Suspension/shocks

Thanks for taking time to write into us today in regards to your 1993 Chevrolet Lumina. The fact that your suspension bars are hanging and that the supports have rusted off is a pretty good indication that it may be...

Q: If there is no noise coming from front end but it fails inspection, any idea on what could be wrong?

The person doing the inspection may have found a part that is very badly worn like a wheel bearing or very loose steering tie rod. The problem should have been described a lot better so you could get an estimate...

Q: Jeep wouldn't accelerate, brakes locked up. Used my ebrake to pull off. No idea what to do.

Hello. Thank you for writing in. Power steering fluid is very similar to automatic transmission fluid, and is the same colors. Typically it is pink, red, or clear. A brown fluid is brake fluid. Its meant to be translucent and...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.