AMG wheels soft?
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Wow, I'm amazed that there is no tearing or significant rip in the sidewall of the tyre. I went through a big pothole a few years ago with the old CLA and it was the opposite, no damage to the wheel but the Michelin had a massive tear from the bead almost to the tyre edge. Insurance claim?
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These tyres are really hard to be fair.
The ride is very uncomfortable. Not sure if it is a trait of continental XL tyres
I was driving the missus mini cooper today and it has 205/45/17 dunlop run flat XL's and even they seem to be a much softer tyre.
I expected the tyre to be bubbled / blow out. Was in shock when i seen the rim was bent. On the face too. Strange
I ran Continental SportContact 6 for a year or two on the previous CLA and found them to be 'softer' than the Michelin Pilot Sport 4 S. I've never had run flats so I can't compare, however the low profile 19" tyres are quite unforgiving whatever brand you go for unfortunately. I find the Michelins to be the best for performance and the middle ground for comfort. There are some older threads about the best tyres for these cars that are worth a look at. Good luck with the wheel mate!
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New 2nd hand rim (refurbed)
Total cost inc changing tyre and valve over £231.40
There was zero damage to the tyre but obviously i will keep an eye on it.
I have also dropped the pressure to 32 PSI instead of the recommended 37 PSI hopefully saving any future rims from damage
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13,213 Posts
the only thing i trust is a calibrated pressure gauge that reads to 0.1psi ... cluster readouts and app displays are just relative offsets from the gauge readings
suggest you keep a nominal recommended cold front pressure of at least 35 ... as the fronts get hotter than the rears during use and insufficient air content could create long term issues from diminished cooling capacity
suggest you keep a nominal recommended cold front pressure of at least 35 ... as the fronts get hotter than the rears during use and insufficient air content could create long term issues from diminished cooling capacity
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... you asked ... so bear with me
its just the rounding error that messes with my long term data sets ... and the error bars are much smaller ... eg 32 left and 32 right rears could actually be 31.5 left and 32.5 right which is a 3.1% pressure delta in suspension/grip/tirecooling performance across the twin 80sqin footprints that one day could mean the difference between holding a high speed turn or spinning out (of course similar considerations for the 36/36 fronts)
in a slalom run i can say for sure the overall time result is different for 34/30 vs 37/33 cold pressures (using conti ecs compound)
our mfa1 chassis are quite well tuned and its perfect and sensitive when balanced
on a separate thread ...
its the precision (not accuracy as thats just a bias term) in the pressure data over time that brings out things like bead leaks, treadwear/alignment issues, suspension consistency, tiny punctures, etc etc ... and so pressures are logged regularly together with a thermocouple probe for temperature references
as it is, there are a lot of variables for long term asset state monitoring, so being able to closely maintain one variable and make it a controlled constant helps make things a tad easier
similarly we use the tick marks on the dip stick to observe actual oil loss volume and hence engine tolerance changes ... or measuring the antifreeze mixture fills at 5mL increments for coolant loss rate and thus coolant loop condition checks ... or 0.1mm treadwear tracking for suspension/alignment monitoring ... granularity has its uses
i am a little cuckoo but thats just me ay?
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183 Posts
This just went right over my head 🤣... you asked ... so bear with me
its just the rounding error that messes with my long term data sets ... and the error bars are much smaller ... eg 32 left and 32 right rears could actually be 31.5 left and 32.5 right which is a 3.1% pressure delta in suspension/grip/tirecooling performance across the twin 80sqin footprints that one day could mean the difference between holding a high speed turn or spinning out (of course similar considerations for the 36/36 fronts)
in a slalom run i can say for sure the overall time result is different for 34/30 vs 37/33 cold pressures (using conti ecs compound)
our mfa1 chassis are quite well tuned and its perfect and sensitive when balanced
on a separate thread ...
its the precision (not accuracy as thats just a bias term) in the pressure data over time that brings out things like bead leaks, treadwear/alignment issues, suspension consistency, tiny punctures, etc etc ... and so pressures are logged regularly together with a thermocouple probe for temperature references
as it is, there are a lot of variables for long term asset state monitoring, so being able to closely maintain one variable and make it a controlled constant helps make things a tad easier
similarly we use the tick marks on the dip stick to observe actual oil loss volume and hence engine tolerance changes ... or measuring the antifreeze mixture fills at 5mL increments for coolant loss rate and thus coolant loop condition checks ... or 0.1mm treadwear tracking for suspension/alignment monitoring ... granularity has its uses
i am a little cuckoo but thats just me ay?
I must say car is much nicer to drive at lower PSI 🤣
Usually on previous cars i just go with 35 PSI all round don't even bother looking at the recommended PSI. Always seems to have worked out okay in the past 😵💫
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2,299 Posts
I put mine at 41 psi (front) and 40 psi (rear), and my CLA is riding on H&R sport springs with Blistein B8 plus sports shocks. It's firm but not jarring at all. I think the H&R sport springs are actually more compliant than the stock Mercedes sport springs.
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the oem units seem to be bilstein b4 systems
apparently they have a less forgiving initial rate curve so the tires work harder and become more prominent in ride quality observations
kinda makes sense and the natural frequencies bear that out ... teeth chatter vs more compliance
one of these days gonna hook up a vibration sensor network and see what this chassis and tire combo really does
apparently they have a less forgiving initial rate curve so the tires work harder and become more prominent in ride quality observations
kinda makes sense and the natural frequencies bear that out ... teeth chatter vs more compliance
one of these days gonna hook up a vibration sensor network and see what this chassis and tire combo really does
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183 Posts
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Either the AMG Line suspension is rock hard or the Conti's are an unforgiving tyre.
Harshes ride i have ever experienced. Probably harsher than my old Civic Type R and it was rock hard 😲
I notice the CLA specs low rear tyre running pressure around the 29/30 psi.
Might drop the rear to this pressure as currenrly 32 PSI
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