Different tires, same pressure?
- Thread starter stangguy
- Start date
The new tire is somewhat shorter, likely has a lower load rating, so you probably want to run higher pressure to offset that.
The 55 series already has a stiffer sidewall and will ride firmer and harsher than the 65 series. Adding more psi will only make it worse, unless that is what you actually want.
I would do some experimenting. I just put new tires on my Buick and finally settled at 33ish. I was running 30 with the old tires so that's where I started but the steering seemed to have a slower response with the new tires so I started adding. When I hit 35 it was to responsive so I backed off.
What are the load ratings?
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A standard load 205/65R15 is a 94 rating. A standard load 205/55R16 is a 91.
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Assuming OP has a Mustang, I would think he's not using it for hauling so not an issue.
But it does affect recommended tire pressure
What about it? That's on a sticker in the door jamb.
205/55 R16 isn't an appropriate replacement for 205/65 R15 as
they aren't same circumference. Both 205/60R16 and 205/65 R15.
However, if both sizes are used or suggested by the manufacturer
they certainly suggested tire pressures for respective sizes. Follow
the car manufacturer.
OP should provide ALL relevant spec incl load rating.
.
they aren't same circumference. Both 205/60R16 and 205/65 R15.
However, if both sizes are used or suggested by the manufacturer
they certainly suggested tire pressures for respective sizes. Follow
the car manufacturer.
OP should provide ALL relevant spec incl load rating.
.
But if the new tires have a load rating that's higher or lower than what is on the door jamb, pressures should be adjusted.
Maybe he meant 225/55R16
Yup, needs 3 psi to get the same load carrying capacity.
Were do you come up with this stuff? You don't even know the brand or model of tire.
I come up with this stuff because about a decade of working in the tire industry has most of this etched in my brain. Hence why I immediately knew the tire he put on was shorter.
I don’t need to know the brand or model because it doesn’t matter for load rating. Size does, and whether or not it is an extra load construction. Perhaps as Roofless mentioned he meant 225/55R16. That would be the appropriate size and load rating.
You’re welcome to look up a typical tire in the sizes mentioned in the OP and see the load ratings if you’d like. An XL (extra load, not extra large) version will typically be three or four points higher than the standard load ratings I mentioned earlier.
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Only for the listed tyre size
because they follow the same standard, no matter the brand
You don't need the brand or model. Ya' see, tires are standardized.
Long version: http://barrystiretech.com/loadtables.html
Short version: If you know the tire size, you know the load carrying capacity. Yes, it varies according to which of the 3 major tire standardizing organizations the tire is built to, but the major difference is the difference between measurement systems (Metric vs English)
For example: The European organization using metric units - a nice round rated pressure of 250 kPa (kiloPascals - named after Blaise Pascal) = 36.3 psi. where the US organization uses the nice round 35 psi = 241 kPa. That makes it seem like there are major differences, but the differences are really small - essentially the same.
Well, I looked up those two different sizes for similar tires and they are BOTH load rated 94, 205/65/15: https://www.tirerack.com/tires/tire...65TR5WCO&vehicleSearch=false&fromCompare1=yes and 205/55/16: https://www.tirerack.com/tires/tire...HR6WCUXL&vehicleSearch=false&fromCompare1=yes Only the speed rating is different.
