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

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: The car cut off and couldn't be started

Hello. It sounds like something may have seized in the engine. Before anything, I would check the battery and see if it died and make sure that the engine belt is intact. If the battery and belt are fine, I...

Q: Cranking but won't start

This sounds like a cam sensor is bad. The sensor will cause intermittent no start since it gives the computer number one cylinder reference. If it fails, the computer does not know where the number one cylinder is and it...

Q: Knocking noise from engine and loss of power

The illumination of the check engine light means that diagnostic trouble codes were set during this incident. The codes are probably "related" to the knocking noise. If there was a mechanical failure in the engine, these codes could have simply...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...