I'm acutally hoping that my speedo reads too high right now and then getting the bigger tire will in effect correct the inaccuracy. I'm doing a test at lunch to find out.

My fear is that the speedo is already reading w/ 4% error and then adding another 4% will make it 8%.

 

Ok, if all of my math is correct, and I have no reason to believe it is...

Speedometer is currently: 3.3% too fast
Speedometer w/ bigger tire will be: 4% too slow

That will work out to me going 0.7% faster than the speedometer indicates w/ the new tires.

Of course, this doesn't take into account the current tire wear which is I don't know how much.

 

Just go buy the Edge Evo, you can correct your tire problem and juice up your engine for more power at the same time!

 

That's more overanalyzing for another time. Let me get through over-thinking this decision first.

 

I've never head of a speedometer reading too slow from the factory. This would open up liability to the manufacturer for speeding violations, etc...

So reason would dictate that if you put some slightly larger tires on, you'll be reading the speedometer too fast, which would reverse the factory error to some degree (which you indicated above).

I think you'll be fine...

 

Speedo's are notoriously off from the factory. I believe it was Car & Driver that used to show indicated vs. actual in thier reviews.

Sorry, just an interjection. Now back to over-thinking.

 

All day long I have been Googling "Speedometer Errors" and it's looking like almost every vehicle has a speedometer error of a certain percentage. And the majority that I was finding were reading faster than people were actually going by a MPH or two.

I am so @n@l retentive and I hate doing something that will possibly change something else up for the worse.

 

Right. I just wanted to make sure that I wasn't compounding the offness. It looks like I'll be compensating, which is actually better.

 

My Speedo has always indicated that I am going faster than what I was actually travelling by about 6%. I plan to step up one size on the tires and that should mostly correct my current error.