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.

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

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: What happens if I unplug my transmission?

Hello and thank you for contacting YourMechanic. The 4L60E has electronic shift solenoids that shift the transmission in first, second, and fourth. If you unplug the harness to the transmission, your transmission will only have reverse and third gear. In...

Q: Coolant leaking

If there is smoke, a leak is likely. Losses in the coolant reservoir would suggest a coolant leak. If you suspect a coolant leak, the origin can be pinpointed if you request a coolant leak diagnostic. It is possible to...

Q: Fuel line is clogged

The fuel lines should not get clogged, unless they got damaged in some way or the lines pinched when repairs were made, for example, if the fuel tank was removed and replaced. The fuel filter, fuel injectors, pressure regulator may...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...