Who kmows the real answer?

147scoob · 30 June 2009, 21:46

I'm in a bit of a dilemma, after fannying around for months trying to decide which tyres to plump for, i decide to choose one that isn't quite the right size. TIT.
I believe my 17's need to be a 215/45, now the 215 bit obviously speaks for itself but the tyres i'm after come in 215/40 or 225/45. Can you and what difference would it make if you put the lower profile on??
Cheers for reading folks, any help would be appreciated

TCHWRX · 01 July 2009, 16:34

215/45R17 to 225/45R17 will change the circumference with 28.27 mm or 1.44% so when you meter shows 70 mph you are doing 71.01 mph.

tanyatriangles · 01 July 2009, 17:03

215/40 is the accepted size for a classic with 17's.

**richiewong** · 01 July 2009, 19:41

Scrub your original tyre choice and get some Goodyear F1 Asymmetrics in the correct size of 215/45/17 for your newage.

225/45 would be my size over 215/40's BTW

TCHWRX · 02 July 2009, 09:44

215/40R17 would introduce a difference of -3.44% (smaller tire).
This would be good if you plan at using this for 1/4 mile or if you think your gears are a little too heavy. Smaller circumference will give a lower gearing and faster acceleration.
Don't know the laws in the UK but in Denmark we have rules as to how much larger / smaller you are allowed to go.

Me personally have always gone with 225/45R17 and 225/40R18 on my car, except for my winter tires, here I went 215/45R17.

Also a lower profile will give you a slightly rougher ride.
What tire are you looking at btw.?

dunx · 04 July 2009, 01:19

My pal KojaK put 225's on and found it had more grip in the wet. Also no negative side effects.

HTH

dunx

147scoob · 04 July 2009, 15:27

Quote:

Originally Posted by TCHWRX

215/40R17 would introduce a difference of -3.44% (smaller tire).
This would be good if you plan at using this for 1/4 mile or if you think your gears are a little too heavy. Smaller circumference will give a lower gearing and faster acceleration.
Don't know the laws in the UK but in Denmark we have rules as to how much larger / smaller you are allowed to go.

Me personally have always gone with 225/45R17 and 225/40R18 on my car, except for my winter tires, here I went 215/45R17.

Also a lower profile will give you a slightly rougher ride.
What tire are you looking at btw.?

Was looking to get the vredestein sessantas! heard many a good thing about them, however concerned about putting wider tyres on these rims, in a safety kinda way!!