Skip the auto shop - Our mechanics make house calls

Q: Tire size change

asked by on

Hello.. I have a 1999 Chevy Venture. Right now the stock tires on it are 215 /70 R15 I'm buying all new tires and I'm trying to save money. Can I replace those with 205 /70 R15 with out any problems?
My car has an automatic transmission.

A: There are some differences in the two tire ...

There are some differences in the two tire sizes and I will go through some of them for you.

See the table below for differences in dimensions:

’Differences

Speedometer Differences

Speedometer Reading / Actual Speed

20 mph / 19.59 mph
25 mph / 24.49 mph
30 mph / 29.38 mph
35 mph / 34.28 mph
40 mph / 39.18 mph
55 mph / 53.87 mph
65 mph / 63.67 mph

Besides the above differences you will notice a drop in fuel mileage of about 1 to 2 miles per gallon since the new tires are smaller and the engine will have to run faster to go the same speed. The new tires will obviously also appear smaller when looking at the vehicle. Have the new tire stood up next to the vehicle when you get to the tire store before installing to see the difference in height.

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

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: Overheating and heat blowing cold

Hi There, This may be a result of a leaking heater core. When there is a leak in the heater core, this can cause the motor to lose coolant via the heater core while also causing a loss in heat...

Q: If my car speed for like 1or 2hrs it will redused speed automaticaly and stop if it want to climb hill i dont no what to do

Hi there: On most Toyota's that are fuel injected, overtime the throttle body, EGR valve, fuel injectors and other fuel system components can become clogged with excessive carbon deposits; which tend to create the acceleration problems you're experiencing. It's possible...

Q: Radiator blower fan makes noise

Hi. A noisy radiator fan can range from the issue being a bad fan bearing or a foreign object hitting the fan causing the noise. I suggest that a well trained technician, such as the individuals at YourMechanic, inspects the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.