Hello, new to the forum. My question is how will 20" rims effect driving. I know 18-19 is preferred but I have a great deal tht will save me over $1k on 20's over the 19's. I will use the money saved on some high performance tires, which lead me to the nxt question. Any suggestions on tires, right now I'm looking at PS2 or Pirelli PZero both running about $1500 for set. My boxster (non-s) is for wkend driving on nice sharp hilly roads. I'm not about to drag race the car but my friends and I drive really aggressive on the empty back roads of Arkansas. Thnk you ahead for those who contribute. Also rims are made by ADR and weigh in at 23.2 lbs each. My 987 boxster MY'07 non S. Again thank you

I would think the 20s would give you a harsher ride. I moved from 19s to 18s to get a little better ride. Also, consider tire prices, look at the difference in prices of 18 " PS2s vs 20" PS2s, I'm lucky to get 15K on the rears and 30K on the front.
As far as tire brand, agressive driving on back roads would want me to lean to high quality and you can't go wrong with the Michelin PS2s, Sumatomo HTR Z III was rated highly by Tirerack at about 1/2 the cost (not available in 20").

wrong place to save money ..... besides the wheels will look odd on so small a car.

20s are for show in my mind. I would put them on my Cayman in a flash but wouldnt go out and terrorize the streets and expect them to perform like an 18 wheel/tire combo.

Will the difference be THAT HUGE? depends on how into it you are in my opinion. I would notice the difference right away because i eat/sleep/breath this **** --- but if my buddy drove it with 20s and then with 18s he would never know the difference.

Bottom Line: do what makes you happiest. If you want to cruise around with your boys and have a "Porsche on 20s" then by all means - will look sick im sure. But if you are a gearhead and want to really squeeze everything out of your Boxster - id stay away.

I agree with everyone about not getting the 20's. I had Pirelli P0's on my boxster, took them off long before they wore out, they are sitting in my garage you are welcome to them. grip level after a couple of thousand miles sucks big time, went to Mich ps2. a little pricey but love them. Good luck making up your mind . using Mich cups for the track - awsome

I read an article the other day when I was trying to decide on 20" or 19". Article said larger rims will slow you down and give a harsher ride. I opted for 8.5x19 in front and 11x19 rear. I went with the Michelin PS2. My rims are 3 piece custom from Modulare so the offsets are made for my car. Also the TPMS wouldn't work with 20" but does with the 19".

larger wheels will tend to make the ride harsher (ever hit a pothole at 50 on 20s with razor thin tires? sucks)

heavier wheels will sap performance.

larger wheels tend to be heavier