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post #1 of 4 (permalink) Old 04-15-2014, 08:43 AM Thread Starter
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Some Wheel and Speedometer Questions

I have a newish to me 2006 Cobalt LT. It has the stock alloy wheels and tire size (205-55-16). Couple of questions I'm hoping I can get some help with:

1. What size tires is the speedometer calibrated for? I believe 195-60-15 is the base size. Was the speedometer re-calibrated from the factory to reflect the car is running 205-55-16 tires or is the variance across the models within reason and all speedometers on Cobalt's were left to correspond with the base (or some other) tire size?

2. Is there an accepted list of other wheels that fit Cobalts? I know there are many lug pattern guides online, I always get a little lost if wheels I have in mind are an exact fit.

I'm specifically thinking of taking tires and wheels off of a Saturn SL2 in the future but wondering if I will have slight issues. What I see online seems to indicate they will match, and the tire size (185-65-15) seems to be within acceptable tolerances vs the 205-55-16 based on some online calculators. (Optional size for the Saturn is also 195-60-15 so that is another reason I'm considering the swap as well.)

Saturn S-series Bolt Pattern - contrary to what this says the Saturn I have in mind has 15" wheels.
Cobalt Both Pattern

2006 Cobalt LT
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post #2 of 4 (permalink) Old 05-29-2014, 07:01 AM Thread Starter
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Bump - anyone?

Especially interested to know on the speedometer calibration.

2006 Cobalt LT
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post #3 of 4 (permalink) Old 05-29-2014, 07:17 AM
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Pretty sure the speedometer is calibrated differently depending on the wheels the car came from the factory with, as are other things like the governor.

As for wheels, I can't be too sure as I've never bought aftermarket rims before.

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post #4 of 4 (permalink) Old 05-29-2014, 07:37 AM
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Wheel size is calibrated through the BCM. Wheel speed is calculated and relayed to the cluster. You are able to select different wheel sizes with a tech 2. To test your speedo, you could download a speedometer app for your smartphone and check it against your cars speedo.


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