Wheels and Tires

Got myself a beautiful 2011 Cayman S last fall and as I endure the winter in Canada I began thinking what I'd to do to personalize it, you know make it my own. and one thought I had was to fit Fuch rims to give it thas early 911 appearance. It is currently fittted with the optional 19 " rims fitted with 235/35ZR19 and 265/35ZR19 tires, while optimum for performance their harsh on Southern Ontario roads, I'm thinking I would prefer 18" or even 17' for the road and keep the 19's for track days (which I aspire to do)

I have a 2014 Cayman S, I want to get 20 inch wheels and another member has these wheels for sale.

https://www.pca.org/node/332893

If I go to tire rack and select 20 inch wheels they spec out wheels with an offset of 45mm.

Wheels above have 45mm and 38mm.

Any way to tell if those will work?

Just bought my first porsche! does anyone know what the peramiters are as far as wheel and tire sizing is concered?

what is the tallest diameter tire/rim combo that would fit? (current setup with 235/35/19 & 265/35/19 are 25.5" & 26.3" in diameter)

what is the widest tire would?

what is the smallest rim which would clear the brake calipers?

I am going to use the car year round thus I need a summer/winter setup. 

I'm thinking of purchasing this set of used winter tires and wheels for my 2018 718 Cayman. Before I buy, I need to be sure these wheel offsets will work with my base 718.  According to the seller, the wheels came off a 2015 Cayman S.

Any advise is welcomed!!

Wheel Specs: (F) 18"x8", 54 offset  (R) 18"x10", 40 offset and 5x130 bolt pattern

Tire Specs: Dunlop Wintersport 3D (F) 235/45/18 94V  (R) 265/45/18 101V

My wife's daily driver is a 2018 718 Cayman with 19" wheels and summer tires. She drove (gently) all last winter on the summer tires with no ill effects. (When there is snow on the roads she takes my 2017 Golf R and I take the truck.) Temperature range in Maryland winters can be 10 to 40 f. Are we hurting the tires by driving them in cold weather? My R has all-season tires, but as far as I can determine, there are no all-season tires for the Cayman 235/4019 f, 265/40 19 r. Thoughts? 

I'm looking for a set of rims for a cold weather setup for my Cayman that came fitted with 19' wheels. I found a decent TireRack Wheel/Tire package featuring the Michelin Pilot Alpin P4 N-spec, but I'm confused about the specs. The wheel set that TireRack matches to my Cayman for this package has an offset of 54 front, 42 rear, versus the vehicle's OEM wheel offsets of 57 and 45, respectively - and with a front wheel width of 8.5". The OEM front wheels are 8J.

I just purchased a 2014 Cayman with 20” wheels that have numerous scratches on the inside of the wheels.  The scratches are in locations where previous wheel balance weights were glued and near the rim edges.  

The scratches are not deep and may have just removed a clear coat.  Are these wheels clear coated and repairable or do you have to start over and refinish the entire surface of each wheel?

I just purchased a 2014 Cayman with 20” wheels that have numerous scratches on the inside of the wheels.  The scratches are in locations where previous wheel balance weights were glued and near the rim edges.  

The scratches are not deep and may have just removed a clear coat.  Are these wheels clear coated and repairable or do you have to start over and refinish the entire surface of each wheel?

What are the disadvantages of driving winter tires in 70+ temperatures (trips from NJ to Gulf Coast in mid January)?