Rear tire replacement...
09-05-2012, 08:32 PM
#17
Racer
Join Date: Dec 2003
Location: Australia
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HotLap I would give up the ton of cash to pay what you guys pay for cars. For the life of me I cannot get over our pricing and never will. That said and done like sheep we still walk into dealerships and buy their cars. I guess a small market etc but I dont know how they can justify the base car being twice the price of that in the US. By the time you add government taxes its 3 times the price. So that said and done $1300 for a tire is cheap 
As I said in my earlier post I can get a set of HREs P40s and tires for less than what a set of tires will cost me here. Thank god for the internet
As I said in my earlier post I can get a set of HREs P40s and tires for less than what a set of tires will cost me here. Thank god for the internet
09-05-2012, 09:39 PM
#18
Nordschleife Master
Thanks Riley, but I didn't make myself very clear. What I wanted you to elaborate on was the last paragraph of your post...."because of the larger overall diameter on the 991 to retard the wheelbase difference".......And I agree with you about plugging tires, but I've only ever plugged a motorcycle tire just to get home, after that it was always new tire time.
You have given some great advice here, so I have some for you. Before you take delivery of the Atom, donate big time to, and become involved in your local Police Benevolent Association. This will be the best way to get to know these fellas, and probably the cheapest. If I had one of those around these parts I would feel like a squirrel in a yard full of dogs. Good luck, I look forward to your posts concerning same.
You have given some great advice here, so I have some for you. Before you take delivery of the Atom, donate big time to, and become involved in your local Police Benevolent Association. This will be the best way to get to know these fellas, and probably the cheapest. If I had one of those around these parts I would feel like a squirrel in a yard full of dogs. Good luck, I look forward to your posts concerning same.
the tires are 1" different which is why the 997 OD is cheaper (more widely available/sold) the 991 OD is unique to the 991 and only a few tires made so far.
as far as the atom, the DA here locally is a close friend.... and one county over all the police know me and even will shut down roads if desired..... i've yet to be convicted of anything.. should be the same w/ atom... fellow atom owners say they get pulled 1-2x a week on average but never any tickets.. if i do end up in the back of a squad car, then i'll pull the DA card.
09-05-2012, 09:56 PM
#19
Burning Brakes
Riley, thanks so much for taking the time to explain. I am either too damn old, or too dumb to understand. I have read and reread a bunch of times to no avail. The wheelbase is a measurement from the centerline of the front axle to the centerline of the rear axle, right? Regardless of what tire is mounted on those front and rear wheels, their centerlines will correspond to the centerline of their respective axles. I understand that their contact patch will differ as their overall diameter reduces, but I can't grasp any change in wheelbase dynamics. I should mention that I failed algebra 1 several times.
09-05-2012, 10:07 PM
#20
Race Car
Riley, thanks so much for taking the time to explain. I am either too damn old, or too dumb to understand. I have read and reread a bunch of times to no avail. The wheelbase is a measurement from the centerline of the front axle to the centerline of the rear axle, right? Regardless of what tire is mounted on those front and rear wheels, their centerlines will correspond to the centerline of their respective axles. I understand that their contact patch will differ as their overall diameter reduces, but I can't grasp any change in wheelbase dynamics. I should mention that I failed algebra 1 several times.
09-06-2012, 07:46 PM
#21
Instructor
Join Date: Jul 2012
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Reily is right on re plugs and patches. Radial Tire in Silver Spring knows its business and takes the same approach (although they are happy to sell you a tire or two or four if you insist).
I also don't understand the comment about 20 in wheels "retarding" the effect of the longer wheelbase. Every professional race team is chomping at the bit to get the longer wheelbase 991 cars for next season because of the substantial stability and weight distribution advantages they have over the 997 shells.
I flogged a Carrera with standard with 19s and a Carera S with its 20s at the PCNA event. I found the handling in both improved over 997s due largely to the wheelbase, and SPASM (lowering/stiffer springs) and Pirelli's rather than Goodyears having predictable effects. If I was a frequent participant in track events I would for lightweight 19 in wheels and better (and less expensive ) tires to get the most out of the car.
I also don't understand the comment about 20 in wheels "retarding" the effect of the longer wheelbase. Every professional race team is chomping at the bit to get the longer wheelbase 991 cars for next season because of the substantial stability and weight distribution advantages they have over the 997 shells.
I flogged a Carrera with standard with 19s and a Carera S with its 20s at the PCNA event. I found the handling in both improved over 997s due largely to the wheelbase, and SPASM (lowering/stiffer springs) and Pirelli's rather than Goodyears having predictable effects. If I was a frequent participant in track events I would for lightweight 19 in wheels and better (and less expensive ) tires to get the most out of the car.
09-06-2012, 10:37 PM
#23
Race Car
09-06-2012, 10:39 PM
#24
Race Car
09-07-2012, 06:50 AM
#25
09-07-2012, 09:03 AM
#26
Race Car
Didn't know that.
I guess if someone requires the flexibility and cost advantage of various wheel and tire choices for tracking, then PDCC could be a disadvantage. On the other hand, Porsche reports that PDCC is responsible for a good bit of the 991 performance improvement over earlier cars, in effect doing real time dynamic chassis optimization.
PS- I am not convinced about "buzz kill" or "dulled response" arguments. As with engine noise, steering and shifting responsiveness, all the 911 goodness is still there with the new technology- just at higher limits in every performance dimension.
Decisons... tradeoffs. Nice to have such "problems"!
I guess if someone requires the flexibility and cost advantage of various wheel and tire choices for tracking, then PDCC could be a disadvantage. On the other hand, Porsche reports that PDCC is responsible for a good bit of the 991 performance improvement over earlier cars, in effect doing real time dynamic chassis optimization.
PS- I am not convinced about "buzz kill" or "dulled response" arguments. As with engine noise, steering and shifting responsiveness, all the 911 goodness is still there with the new technology- just at higher limits in every performance dimension.
Decisons... tradeoffs. Nice to have such "problems"!
09-07-2012, 07:19 PM
#28
Drifting
09-08-2012, 11:04 AM
#30
Drifting
Michelin Super Sport tires ai 295/30ZR20: http://www.tirerack.com/tires/tires....m=93YR0PSSXLV2