Looking for advise on changing tire sizes - MINI Cooper Forum

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post #1 of 6 (permalink) Old Sep 1st, 2018, 04:32 PM Thread Starter
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Looking for advise on changing tire sizes

I have a 2013 Cooper S with Continental 205/45/17s run flats. I live in metropolitan NY city area and the roads are horrible. I would like to improve the ride. I see Continental make the same tire in a bigger side wall 205/55/17. Does anyone have experience in going to a wider side wall, will it fit the car? My local mini dealer will not opine on the topic. Any advice would be appreciated. Also any knock on issues with regard to changing tire size, i.e. speedometer adjustment, would be appreciated as well.

Thanks in advance.

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post #2 of 6 (permalink) Old Sep 1st, 2018, 05:23 PM
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I am running 215/45R17 Michelin Pilot Sport 4s
on my 2009 JCW R55 with close to stock +45 offset
17x7 Enkei wheels with no problems. This tire isn’t made in 205/45R17.
I’m debating between this size and 205/50R17
for winter tires (leaning towards the latter) in
a few months for the oem tires with old all seasons
that came with the car, but I don’t think I’d
consider 205/55R17 as that’s just too tall.
Winter tire choices in 205/45R17 are limited and
not to my liking.
I have a compact spare in the boot and a dynaplug kit
and pump so I have no qualms about non-run flats.
If you’re willing to go to non-run flats, that will
make a much bigger difference than a slightly
taller sidewall in a run flat tire.


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post #3 of 6 (permalink) Old Sep 1st, 2018, 05:38 PM
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Also, changing the shocks and struts to Koni
FSD (now called Special Active) will help
ride quality quite a bit, provided you stay with
stock ride height/springs (highly recommended
for rough roads and also necessary if using
these shocks - they’re not designed for lowered
MINIs).

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post #4 of 6 (permalink) Old Sep 2nd, 2018, 06:49 AM
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Quote:
Originally Posted by Mwsanborn View Post
I have a 2013 Cooper S with Continental 205/45/17s run flats. I live in metropolitan NY city area and the roads are horrible. I would like to improve the ride. I see Continental make the same tire in a bigger side wall 205/55/17. Does anyone have experience in going to a wider side wall, will it fit the car? My local mini dealer will not opine on the topic. Any advice would be appreciated. Also any knock on issues with regard to changing tire size, i.e. speedometer adjustment, would be appreciated as well.

Thanks in advance.
i would get rid of the run flats for a start i got rid of mine on a nearly 2010 clubman makes all the difference no more crashy drive so much better just carry a couple cans of tyre foam in boot,
as for your question i take it because the low profiles feel crashy hard on the road, put non runfats on it will sort it so much better road noise drops a lot as well.
as for increasing the wall from 45 to 55 profile dont do it it changes the speedo, changes the gearing of the car will make it feel less powerful. should increase mpg but will change way car drives and not in a good way,
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post #5 of 6 (permalink) Old Sep 2nd, 2018, 11:34 AM
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This tells you the difference going 205/45 to 205/55 will make to ride height, arch gap, speedo mis-read.
https://www.willtheyfit.com/index.ph...h=7&offset2=48
The speedo will under read by 10% - which is a huge amount and unacceptable. And the gearing will be lengthened by 10%. Also a bad plan.

As posted, get rid of the run-flats. The difference in ride is really marked. If you feel the sidewall of a RF off a rim, it is like wood - no give or flex whatsoever.
You could go 215s rather than 205s. This will give you a bit more flex in the sidewalls. And a speedo under read of 1.44% which is acceptable.
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post #6 of 6 (permalink) Old Sep 2nd, 2018, 10:39 PM
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Quote:
Originally Posted by cristo View Post
Also, changing the shocks and struts to Koni
FSD (now called Special Active) will help
ride quality quite a bit, provided you stay with
stock ride height/springs (highly recommended
for rough roads and also necessary if using
these shocks - they’re not designed for lowered
MINIs).
Can you get AP coilovers by KW Automotive in the US? Here in the UK they are cheaper than FSDs. And the ride is so good. Unlike most coilovers, the springs (fronts) are progressive rather than linear, so they absorb all the ruts, ripples and irregularities in the road surface. Numbers of us on here nhave them. And feed back about the compliant, comfortable ride is pretty much universal.

Having said that the few who have fitted FSDs like them a lot, great ride.
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