Lude Generation

Get some type s 16 inch wheels and run 45 profile tyres, how much would my Speedo be out? Currently running motegi wheels, but unsure of tyre size....

You should go 225 wide if you want 45 profile.
Stick with 50 on 205 wide.
Do a tyre size calculator on loogle.

3.35%. At 70 on 50-R16 you would be doing 67.66 on 45-R16

This is a site I saved in my favourites.
http://www.carbibles.com/tyre_bible_pg4.html

The "ratio" so 45 is a percentage of the width (ie 225), which creates the wall height. So the physical dimension of a "45" ratio tyre varies depending on the width. Just so you know

Yeah. Good point Nafe. I didnt know what width of tyres you were looking at so used 205 on both to give you an idea of the comparison.
Edit: 205-50-16: 70mph would equate to 69.71mph on 225-45-16.

LewisH wrote:Get some type s 16 inch wheels and run 45 profile tyres, how much would my Speedo be out?

If you pop out of your Speedos you might get arrested.

True sailor haha. If its not gonna put it out much I'll go for the lower profiles I think.

I wouldnt. You will compromise the handling and it will look absolutely pants.

Ill compromise the handling? Please explain, lower profile tyres = less tyre roll, and im on coilovers too, front and back strut bars with 2WS conversion. I cant see how 45 profile instead of 50 profile will effect my handling at all ?

Not this again...

The Prelude camber caster etc etc is all tuned to work with a 4" side wall (205/50 or 225/45 or 245/40)
The tyrewall is part of the suspension.
A lower profile tyre will increase response but will loose grip and stability in the corner.
215/45 or 235/40 is a good compromise.

205/40 or 205/45 is just plane skinny.