Is it always the drive wheels? Front wheels?
Number of Fred Flinstone steps?
Thanks for any info!

 

It's actually taken off the back of the gearbox regardles of whether you're vehicle is FR, FF, or AWD.

 

if that is the case, the profile of the type would throw the accuracy of the speedometer and odometer out then, wouldn't it?

 

Huh?

 

The profile of the tire? right?

 

Yep. If you use a wheel/tyre combo with a different rolling circumference your speedo will be wrong.

To calculate the error go to Tyre Calculator

Just as an exercise, enter the stock tyre sizes and the tyres used at the link in my sig.

 

AusS2000 - Do you know if there is any practical way to modify anything, say in the speedo connection to the drivetrain, or anything else to offset the impact of using larger wheels/tires, so that the speedo stays reasonably accurate?

 

They sell gear sets at your local speedo tuner shop. I had it done when I had bling bling wheels on my prelude, those were the days!!

 

As above. I remember in the old Datsun days that the speedo drive was a cable which terminated in a nylon gear that mated with a cog in the prop shaft at the rear of the gearbox. You could get different gears with off-centre mounting. This was to allow the same gearbox to be used in different models.

Don't know how much luck you'll have with the S. And remember it will change your torque characteristics too. Bigger circumference means slower 0-60.

ATS sell a final drive gear set that does the opposite. It gives you lower gearing out of the gearbox and hence better acceleration. In this case the speedo will also show a higher speed than you are actually doing.

The best bet is to get bigger rims (17, 18) with lower and lower profile tyres (40, 35) to achieve the same rolling circumference. You'll notice that the 245/40-17's I'm using have almost exactly the same rolling circumference as the stock 225/45-16's.

Oh, and it looks dope ghetto pimp [insert other youth culture jargon here] too.

 

So....meaning....on the drive wheels! Basically, on the rear set of wheels on our S2K!
Which also means, I can put whatever size wheels/tires on the front and it won't affect the odo/mph!!!