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Old 05-04-2017, 09:26 AM   #1
Type2fan
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Default Tyre pressures

Hi
I've just got some Fuchs alloys for my 78 bay. What tyre pressures are you guys using?
I've got 155 65 15s at the front and 185 65 15s at the back.
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Old 05-04-2017, 12:15 PM   #2
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Stock tyre pressures, no matter what wheel/tyre combo as it's based on the weight of the vehicle.
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Old 05-04-2017, 04:54 PM   #3
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Thanks mate
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Old 06-06-2017, 04:10 PM   #4
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Quote:
Originally Posted by Stu_b View Post
Stock tyre pressures, no matter what wheel/tyre combo as it's based on the weight of the vehicle.
Sorry to contradict, but wrong, wrong, wrong. The contact patch size changes with tyre size, therefore the pressures require changing also. You wouldn't use stock 17psi with 125s on a cal look and 285s on a Baja, would you! The narrow tyres would require a higher pressure so they don't wear the edges, and wider tyres require a lower pressure so they don't wear the centre.

My wide mountain bike tyres require 60psi, my skinny road bike tryes 130psi - same weight of vehicle...

To get even tread wear on my 215/75 x 15s on a Bay requires 27psi front and 35psi rear, giving me perfectly even tyre wear over the 130 000km I have driven it. A previous Beetle had 205s front at 15psi and 225s at 24psi the rear to avoid wearing the edges. With the sizes you quote you will need considerably higher than stock pressure up front and probably a little more than stock at the rear, and make sure they are properly load rated.

Cheers, Carl.
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