315/30/20 or 325/30/20
06-14-2018, 07:31 AM
#31
06-14-2018, 07:58 AM
#32
A baggier tyre, will squirm a little when you are hard cornering or tracking. I have ran a 305 on a 10 inch on an M4, and it was baggy. I wouldn't do that in a Porsche, as they are rear engined and go around corners harder and put more pressure on the tyres.
On an 11 it will be OK, but if you want to set best lap times on an 11, then 285 would be the go. Just think, 300mm is 12 inches, so a 305 is perfect for a 12 inch rim.
280 is perfect for an 11 inch rim. There isn't a 280, so 285 is perfect.
On an 11 it will be OK, but if you want to set best lap times on an 11, then 285 would be the go. Just think, 300mm is 12 inches, so a 305 is perfect for a 12 inch rim.
280 is perfect for an 11 inch rim. There isn't a 280, so 285 is perfect.
https://www.michelinman.com/upload/m...port-cup-2.pdf
Acceptable rim widths for a given tire are listed. Additionally, you will normally see a nominal width listed with an associated tire section.
Example, a 325 series tire accepts a 11"-12" rim width with a nominal width listed at 11.5", which provides a 13" rubber section to the road.
Also keep in mind how rim widths are measured. Rim widths are measured from inside the barrel. So, for example, an 11.5" may have an overall width closer to 12" or 12.5" depending on the wheel construction. This is important because a 13" section width might look like its bulging on a 10.5" width wheel but just right on a 11.5" or 12" wheel, if you care about aesthetics.
Sidewall flex is certainly something to be considered and will definitely adjust how the car feels as it moves under you. Since sidewall height is a percentage of the tires width, larger width tires will have a higher sidewall for the same aspect ratio. Manufacturer data sheets should show overall diameter. Higher sidewall tires will feel softer since you are essentially adding additional flex into the suspension. How this flex effects performance is one variable amongst many. But, a softer ride does not necessarily equate to reduced performance.
06-14-2018, 11:07 PM
#33
I think some turbo owners are running 265 front 325 rears, it probably works w minimal rubbing at full lock.
I'm running 245/35 and 305/30 Cup2s on the Sport Technos (9 and 11.5 in wide I believe), they work great, look fairly square. YMMV
I'm running 245/35 and 305/30 Cup2s on the Sport Technos (9 and 11.5 in wide I believe), they work great, look fairly square. YMMV
06-14-2018, 11:59 PM
#34
Thats a 305 you posted and a MPSS. That is neither a 325, nor a Cup 2. (I think dude was calling BS on 255/325 Cup2)
MPSS = PZero
MPS4S = Corsa
MPSC2 = Trofeo R
If you went same size from PZero to MPSS, there would be no real difference. For an up grade you should have gone 4S. (The S is important as there is just a 4 as well which I think replaces the SS)
MPSS = PZero
MPS4S = Corsa
MPSC2 = Trofeo R
If you went same size from PZero to MPSS, there would be no real difference. For an up grade you should have gone 4S. (The S is important as there is just a 4 as well which I think replaces the SS)
the MPSC2 is a cross over tire (look at the tread wear rating). The Porsche spec Pirelli Corsa, as run on the ring test, is close to a MPSC2 and sits between the P Zero N1 and Trofeo R. The MPSC2 N1 (and I've gone through a quite a few) is great as a cross over tire in the dry and lasts far better on track than any other street tire (the exception being the Advan 08r which cant be had in Porsche fitment). My own experience with the P Zero N1 is it is a very good tire when fresh - I have posted times within a second of those I have generated on MPSC2 N1. However, the MPSC2 N1 is v.poor in the wet/cold particularly if it has gone through a few heat cycles. As an all round tire the MPS4S N0 is the one to get for general use.