Talk Morgan Forums Thread Like Summary - Tyre pressure question

This might sound like a daft/simple question but I have no reference points for the following:

A 1973 4/4 4 seater, retro fitted with 195/60 15 tyres (on wires if that makes any difference, but I doubt very much)

The engine is not standard (1.8 twincam), so I don’t know if the weight increase and/or power increase will have a minimal or significant impact?.

The car feels fine on the road but I am very aware that the pressures haven’t been checked for almost a year (other than me checking that they are all of a similar psi and adjusted to the highest reading of the four)

To clarify,I am not a complete novice, I know a lot of the cars quirks, reasonably competent with a set of spanner’s and I have literally been brought up with the car, but what sounds like the simplest, most routine maintenance, is something that I don’t really want to leave to guesswork/look/feel.

Any advice will be greatly received.

Have a great weekend and thank you in advance.

Yep! you'll find tyre fitters arguing with you re. the 22 psi when you change them but that is the factory recommended setting. The cars are so light that they really add little load to the tyres and to keep the tread fully in contact with the road 22psi is about right although you might have to play around very slightly as different brands have varying wall stiffness and this will have an effect on getting the maximum contact with the road and, as has already been said. the tyre is the first part of the overall suspension system. For instance if you are finding your suspension a tad hard you could consider upping you tyre profile to 65 from 60 and this will give you a diameter increase of around 20mm, a greater ground clearance of about 10mm but will improve the ride quite a bit. Not sure what is standard on your age 4/4 but I'm sure they had 15" rims with quite a large profile but going up to 65 from 60 will make little difference to the registered speed. How ever before any real assessment can be made a perfectly working and serviced suspension system is your first starting point. such small differences say through lack of service or poor adjustment can make a great car feel like a shed!

I ran my 3.7l Roadster on 24 front 26 rear based upon claculation P Jenks did on here based upon the caravan club info
I replaced the tyres on age at 28k.

Not being a lightweight myself, I find 22 too soft - easy to squeal tyres on short sharp corners, so I run 23 front 24 rear, unless I have additional weight on the rack in which case I might raise the rears by another 2 psi.