if i was to...

LewisH · Post by **LewisH** » Tue Mar 12, 2013 10:27 pm

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....

Post by **RattyMcClelland** » Tue Mar 12, 2013 10:39 pm

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

andypont · Post by **andypont** » Tue Mar 12, 2013 10:51 pm

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

Post by **NafemanNathan** » Tue Mar 12, 2013 10:55 pm

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

andypont · Post by **andypont** » Tue Mar 12, 2013 10:58 pm

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.

YouTube · Post by **Sailor** » Wed Mar 13, 2013 1:35 am

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.

LewisH · Post by **LewisH** » Wed Mar 13, 2013 7:07 am

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

Post by **RattyMcClelland** » Wed Mar 13, 2013 10:32 am

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

LewisH · Post by **LewisH** » Wed Mar 13, 2013 9:07 pm

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 ?

Post by **RattyMcClelland** » Wed Mar 13, 2013 9:40 pm

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.