17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHVery harsh drive
Leading reported evidence
Fill rears
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Leading evidence: 'Fill rears' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check date code' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
So replaced my cracked bridgestone SO2s from 2006 with New P Zeros.
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Performed · outcome unconfirmed
Get those tires changed pronto before you have a blow out at speed.
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Suggestion
Plus one to check for pressure, and if the tires are worn that can be a big factor.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T052503Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 04 C4s Cab with 60K miles. I've noticed lately my car has a very very harsh ride over moderately uneven surfaces, especially on the freeway when I�m up to speed.
The drive feels better when the road the super smooth, but just doesn�t feel right.
I know I need tires - as they are starting to crack a bit, but could tires cause all of this?
Are my shocks done?
I am guessing your tires are due for replacement. What is the tread depth? Also, ensure the tire pressures are good. I doubt that your suspension is getting tired with only 60k.
If your tires are cracking, that is definitely affecting the ride and noise. Also, if your tires are cracking and you have tread left, you need to drive it more.
Just saying.
My 996 has 19's and I recently started a post about cupped tires and noise. On the advice of another member I raised the rear pressure to 40 and the fronts to 36. Today I added more air and made the rears 42 and the fronts 37. The car really does ride much more solid, no more BANGING when I hit a bump in the road and best of all the tire noise is down by probably 50%. I am amazed on the impact this has had.
My car had 17's on it until December and I had the pressure set the same way I did with the 17's and that was all wrong for the 19's.
1) If your tires are "cracking" they likely are old and hard. Did they come with the car when you bought it? I had the same problem when I purchased my 2000 C4 in 2010 and discovered the tires were nearly as old as the car. The PO had no doubt switched wheels and tires with another set that had sat in the garage for years when he got ready to sell. Check the Date Code on those hockey pucks!
2) I have been told that gas shocks can "go hard" if they leak the gas... not fluid. Had this confirmed on my 1998 Audi when one strut stiffened up - after 100,000 miles - a new set of Bilstein Sport struts fixed things very well.
3)May or may not be your issue but my 996 suffered a bent front strut after a meeting with a San Fransisco pothole and that gave the same result - a very "firm" ride. This also made thunking noises at low speed which lead to the diagnosis and ... again a new set of Struts - PSS9's this time.
Performance tires deteriorate rather abruptly at 5-6 years of age, regardless of treadwear. Might have a look at the date codes on your tires and see how old they are.
Replacement is expensive, obviously, but if they're aged out you might be amazed at the difference fresh rubber will make.
- Tires are from 2006, I am getting them replaced this weekend
- Tire pressue was a little low, I added a 5 lbs to the front, the drive is a little better
Great news. Tires are only a 6 year life span. I had some 1 year old bike tires go into cracking sidewalls from not riding for a year while on a trip and the bike just sat in the garage. Best to keep the tires exercised which keeps the rubbers chemicals spread throughout. Sitting doesn't allow the flexing to help spread the stuff that keeps the rubber good.
Nice hour long drive in town and on the highway. Plenty of bumps and smooth roads along the way and I liked the feel and response. Also first time I've driven this car in a spirited way, she really responds @3-3.5k rpm gear shifts. In love all over again
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