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Well, Im at 6000 miles and my tires are starting to look a little worn and Im looking for new tires. One thing I need to consider is that this is my every day car so I need a set of tires that I can use reasonably in the midwestwinters.
Im looking at a set of Michelin Pilot Sport A/S. But, they dont come in the same size as the stock tires.
My question is that am I fine going from a 235 on the front to a 245 and from 265 to 275 on the rears? Both are a 35 aspect ratio on a set of 19' wheels. They are only about 1% off original size, so Im not worried about the PASM. But, is such a small width difference going to be a problem, specifically up front?
I think Im probably fine, but wanted to check to see if Im missing something.
Thanks, Jason.
Edited by - Cayman Jason on 08/21/2006 7:11:38 PM
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
One last question, has anyone used or have any experience with the Bridgestone Pole Position AS tires? They come in the same sizes as the Michelins, but are much less price wise.
CJ: Are you 'beating up' your tires that you've only gotten 6,000 miles and they are done? This seems to me like an awfullly short time for a set of tires. In previous threads on this topic, people have indicated that tires used only in normal/everyday driving should last 15-20,000 miles.
I still cannot get over how fast these tires wear down[img]/fckeditor/editor/images/smiley/MWPX/sad_smile.gif[/img]it wouldn't be so bad if there were cheap!
I havent been autocrossing or anything like that. I really dont drive all that hard now. But I think when I first got the car, I took a lot of corners at higher speeds because of the sheer fun of it. Then I found out how much the tires cost and have eased up on them a little. My tires arent completely baked, but I anticipate needing them before the weather here turns cold and potentially a little snowy. I would be surprised if I make it to 10,000 miles on them.
Something is wrong, my tires have over 10,000 miles on them now including an autocross and some 'agressive' driving and they look like they could go 20,000 miles. Have you had your alignment checked? Bring your car by and we can compare tires, happy to help out if I can.
It's my understanding that all the Caymans come with High-performance summer tires. Regardless of tread wear or milage, you don't want to be driving on them when the temp drops below ~40, nevermind if there's any possibility of ice and/or snow.
I drove mine all winter in well below 40 and snow and ice. There is PSM on these cars ;-)
I'm at 15000 miles and just having the rears changed for the first time. That includes a track day and an advanced Porsche driving day. Plus my usual driving.
Think I need to add more negative camber though, as the outsides are much more worn than the insides.
Jack
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
Thanks Ken, appreciate it. Ive never had tires that are as high of performance as these so I may be a little premature in my search. The tires are wearing evenly, so I think everything is fine. Regardless, Im going to need new tires for every day driving this winter and I just want to make sure that going up 10 on the width isnt going to be an issue.
Not sure how much snow and ice you get, but for us in the most of Canada, we have a fair bit - the standard recommendation is to go with narrower tires for winter driving. My car will be put away for the winter so I have not had a chance to look into this issue - good luck.
