Ive got 22" overfinch alloys on my sport but only got a 19" spare, how do i go on if i get a flat tyre? i'm sure the rolling diamater of the 19" wheel isn't the same as the 22" wheels, any advice would be greatfully received, and no before you ask, i'm not swapping my 22's for your 19's sorry.
Ady

They should have the same rolling diameter (or within a few %)

For example 255/50/R19's have a rolling dia of 91.2"
and 285/30/R22's are 90.25"

Difference of 1.04% RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

I had 22's for my S/C but Mrs pea damaged one when she hit a pot hole, well when i say pot hole i mean more, a hole to australia, anyway when i swapped it with over the 20's the automatic gear changes went to pot. when in auto mode it wouldnt change up past 2nd gear i had to knock it into sport and manually change it up a gear with the tiptronic mode.

At first i thought it was a coincidence and my S/C had developed a gear box or control unit issue but later swapped the other 22's wheels for the original 20's and bingo problem solved. Only explanation i have was that the rolling radius was fractionally out which caused the control unit to get its self in a tizzy.

Thanks for the replies guys, its the small % differance that concerns me, i don't want to end up with a damaged diff or box, Anyone else have any answers or experiances
Ady

X5pea
Your story reminded me of an weard issue I had with my bmw 7.
I noticed one day that it would not go into top gear (forgot if it's 5 or 6 speed!)

Took it back to BMW 3 times re this and still could not resolve the issue.

One day I noticed the passenger back tyre was a little flatter than should have been, nothing major though. It was like waving a magic wand!!! Auto box was fixed

There must be speed sensors which stop things working.

I to have 22" wheels and a 19" spare. May be best to drop the psi On the spare if used to even it up a little better.

Great question Ady 555 - better to know before the event. RRS HSE with a few extras & a
2013 RRS Autobiography

Just what i thought Guy, Another question is it possible to fit a 22" wheel in the spare wheel carrier
Ady

even if you use a smaller diameter wheel for a few days before you get tyre fixed, i wouldnt think it would be a problem, ive heard that it is difficult to feel a punture because of the self levelling air suspension - hence the optional tyre pressure indicator
cheers
dave MY10 TDV6 SE (debadged ), Santorini Black, Flappy paddles, Privacy Glass, 20" Stormers, Mudflaps!

Gone: a comprehensive list of imprezas and a Merc ML AMG

Hi dave thanks for the reply, looking at your signature i'm an ex impreza owner ive had a MY2000 UK and a 51 plate P1 which i owned twice, what have you had?
Ady

Ady 555 wrote:

Just what i thought Guy, Another question is it possible to fit a 22" wheel in the spare wheel carrier
Ady

No, 20"will fit nicely.

http://www.landroverwinkel.nl/My_Homepage_Files/Page9.html SW

Sometimes it is not enough to do our best;
sometimes we must do what is required.

2005 RRS HSE 2.7 TDV6
Now: 2016 RRS HSE DYNAMIC 3.0 TDV6

Thanks for that.
Ady

I'm sure as a temp measure it would be fine, your hardly gonna run about with a different sized wheels on the same axel for days. LR supply 20" wheels and 19" spare so i assume there is no issues there but its well known that they arent happy with the 22" wheels being fitted, i assume this is one of the reason.

ady,

2 classics, and a hawkeye, best one was the second classic, deep blue mica with PPP, with a prodrive group N 4 paddle clutch, always regreted selling that one. keep looking for a suitable trackday/rally car, they are soooo addictive!!
cheers
dave MY10 TDV6 SE (debadged ), Santorini Black, Flappy paddles, Privacy Glass, 20" Stormers, Mudflaps!

Gone: a comprehensive list of imprezas and a Merc ML AMG

codfather wrote:

ady,

2 classics, and a hawkeye, best one was the second classic, deep blue mica with PPP, with a prodrive group N 4 paddle clutch, always regreted selling that one. keep looking for a suitable trackday/rally car, they are soooo addictive!!
cheers
dave

Another ex scooby owner here as well
UK classic, then 2003 STi then 2008 STI

Great cars but expensive to run (for their size!) RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI