I use 30 front 40 rear. If you use 2 psi more for each inch increase in wheel size over standard maintaining rolling radius you won't go far wrong.
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Thanks @wammers I'll give those a go.
By the way, is there any way to tell if spigot rings are the correct size? they fit into the wheels fine, but they didn't seem particularly tight on the hubs. I'm 99% sure they're fine, just that niggling concern in the back of my mind that my wheels are going to come flying off on the motorway.
By the way, is there any way to tell if spigot rings are the correct size? they fit into the wheels fine, but they didn't seem particularly tight on the hubs. I'm 99% sure they're fine, just that niggling concern in the back of my mind that my wheels are going to come flying off on the motorway.
ukadamwest
Well-Known Member
I have the 19's on my p38 and run 28psi all round. have done for 4+ years and get dead even wear across the tread face.
Usual load is 2 adults in the front empty boot and use the same pro for towing tilt trailer with a RR on it.
Its good economy to ensure your tracking is on the money
Usual load is 2 adults in the front empty boot and use the same pro for towing tilt trailer with a RR on it.
Its good economy to ensure your tracking is on the money
Hmm, I (stupidly) didn't check the rings on the hubs, I put the rings into the wheels, then put the wheels on. The wheels didn't feel particularly loose or anything, but they weren't at all difficult to push onto the hubs.
The rears have a different pressure than the fronts for a reason. But if you are happy with that so be it.
ukadamwest
Well-Known Member
Indeed. I ran a higher pressure at first and got wearing across the centre band. at 28 all round it gives even wear. I monitor it with an electronic gauge and that gives the even wear. go figure!
myfirstl322
Well-Known Member
...and what's the reason wammers?
Viscous coupling.
Datatek
Well-Known Member
The rear is slightly lighter than the front unloaded and could be considerably heavier when fully loaded, so why would the tyre pressure difference be for the viscous coupling? As far as I can ascertain, it's to accommodate the potential load.
To keep the coupling primed.
Datatek
Well-Known Member
With 2 sets of vanes in a bath of silicon fluid, how does it get "Primed"
Now come on Keith have a think about it.
The wheels are centralised by their fit on the hub centre. The hub centres on L322 are slightly larger than the hub centres on the P38. So a spigots are needed to centralise L322 wheels on a P38 hub.
19" look so much better and compliment the car. Make it more balanced looking. On normal roads the ride is no different.
Datatek
Well-Known Member
I have one on 16" rims and one on 18", the ride on the 16's is noticeably more supple on our country lanes.
