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I have a 2014 Volt with 61,000 miles. All of a sudden it seems to be hitting bumps hard. Is this a sign of worn suspension? I also noticed that my new Michelin Energy Savers were reading 44PSI instesd of the normal 38. The tires were actually 44 for the front and 42 in the rear. Could the high inflation make the ride harsh? Any thoughts would be appreciated. The car always used to ride so smooth.
 

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I have a 2014 Volt with 61,000 miles. All of a sudden it seems to be hitting bumps hard. Is this a sign of worn suspension? I also noticed that my new Michelin Energy Savers were reading 44PSI instesd of the normal 38. The tires were actually 44 for the front and 42 in the rear. Could the high inflation make the ride harsh? Any thoughts would be appreciated. The car always used to ride so smooth.
Did you drive to a higher elevation? That could account to an increase in the tire pressure. I have noticed that the ride of my 2017 Volt with Michelin EnergySaver tires is harsher when the temperature drops below 40F. The tire compound may become stiffer at colder temperatures.
 

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Yes, a higher psi can result in a harsher ride.
 

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Lower profile tires require high tires pressures (high tire pressures give longer range too) and hence a harsher ride over bumps. At speed bumps I slow down to a crawl, in the Volt because if high tire pressure/low profile tires and in the TR7 because of low ground clearance because the California cat will scrape the speed bump.
 

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Also, set the tire pressure the same regardless of front or rear. All 4 of my tires are set at 41psi. Not only does the higher psi provide a bit more battery range, but it gives me a buffer before the tires get too low on psi. When they eventually drop to 38psi, I top them off. So ZZI can lose a few psi without ever running on low tire pressure, something to avoid if you want maximum life out of the tire.

A note, never exceed the max psi for the tire as shown on the tire sidewall. Like too low of psi is bad, so is too high. Different tires have different max psi.
 
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