How much tire pressure in 15's -195/65/15? - Mercedes-Benz Forum
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#1 (permalink) Old 04-19-2011, 02:04 AM
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How much tire pressure in 15's -195/65/15?

Folks what is the accurate trie pressure one should maintain on a 15inch setup - 195/65/15 that I have on my 240D 1984 model? Thx
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#2 (permalink) Old 04-19-2011, 04:57 AM
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I go with the recommendation on the side of the tire, max, or near.

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#3 (permalink) Old 04-19-2011, 08:08 AM
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I still use the factory recommended pressures, 28/32 front and rear. Not sure if or how a +1 wheels size would make a difference in a tire pressure recommendation.

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#4 (permalink) Old 04-19-2011, 08:49 AM
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Use factory pressures. I'd use the "high speed" pressures. The tyres will last longer and run cooler, although it claims to reduce driving comfort. I haven't experienced and difference in road noise or comfort, though.




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#5 (permalink) Old 04-19-2011, 10:42 AM
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I personally always go about 10% less than the max on the sidewall of the tire. The suggested pressures on the car are only valid for the exact stock tires and often are lower so the car rides softer. If you run them around the max cold psi then your ride wont suffer too much and you will get better wear and fuel economy. Like now my tires have max of 45 psi so I run around 40 psi.
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#6 (permalink) Old 04-19-2011, 11:27 AM
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Originally Posted by Giffels View Post
The suggested pressures on the car are only valid for the exact stock tires and often are lower so the car rides softer...
NOT TRUE! The tyre pressures are detemined by the load exerted on them by the car's mass. Read the owner's manual.

In general, you are right about harder tyres lasting longer and giving better economy, BUT they also lose traction - you could be running on just the inside of the tread rather than the full width of the tyre.




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#7 (permalink) Old 04-19-2011, 11:37 AM
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[QUOTE=PlaneCrazy;4683946]NOT TRUE! The tyre pressures are detemined by the load exerted on them by the car's mass...

I agree that they are determined by the mass of the car as well as tire specifications, however I always assumed these calculations are based upon a soft ride, and 1985 rubber. The tires you buy for the car also have the load rating factored in thus it is a relative calculation for the mass of the car. There is nothing wrong with running those pressures however they are generally lower than the optimal tire wear/rolling resistance level. when you do inflate them near the cold max you also need to check for tread wear after you get some miles on them and adjust accordingly. Just my opinion, I have always found those pressures listed in cars to be like 15 psi off, mainly because they are calculated for best grip (lets face it if you are exploring the grip limits of a w123 you are driving the wrong car ) , and comfort level not necessarily wear and better mpgs.
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#8 (permalink) Old 04-19-2011, 10:38 PM
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Thx folks I am confused!?..cant see one line of suggestion coming...
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#9 (permalink) Old 04-19-2011, 10:40 PM
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Anything at or above what the sticker in your gas flap says will be sufficient.

I personally tend to run about 5 psi over those numbers [up to the max pressure on the sidewall of the tire] to reduce sidewall flex, reduce rolling resistance. you'll get more noise from the road at these pressures, but moving to 15s is going to introduce more noise anyhow.
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#10 (permalink) Old 04-20-2011, 04:46 AM
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Thx folks I am confused!?..cant see one line of suggestion coming...
See post #2.

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