RyanT
Forum User
Any car nerd worth their salt should recognise that treat pattern. AD08R.
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16" wheels - tyre choices?
- Thread starter arcdef
- Start date
Any car nerd worth their salt should recognise that treat pattern. AD08R.
Ian
Club Member
I've used R1R in 225/45/16 which were great but are no longer available. So I've moved to ADO8R in 225/45/15, not driven on them yet though, but have them fitted to my other car in which they work great. Looking to move to Pirelli P Zero Trofeo Rs for the rear in 245/45/16 as thats as big as I can get without going to 17s.
arcdef
Club Member
So went with the Toyo Proxes TR1 in 225/50/16 and took it out today for first run.
Wasn't that impressed if I'm honest, fleet very floaty and significantly less grip when braking/accelerating even go as far as saying felt unstable.
Checked the pressures and the garage had pumped them up to 34psi so adjusted to 28psi and still not much better.
Is 28psi still too high or could it have some kind of film on there causing grip to be less? Driven cars with a new set before and normally they feel much better out the box.
Thanks
Wasn't that impressed if I'm honest, fleet very floaty and significantly less grip when braking/accelerating even go as far as saying felt unstable.
Checked the pressures and the garage had pumped them up to 34psi so adjusted to 28psi and still not much better.
Is 28psi still too high or could it have some kind of film on there causing grip to be less? Driven cars with a new set before and normally they feel much better out the box.
Thanks
That's high IMO. It's a light car on big tyres - I'd give it a try about 5 psi lower.
toopy
Club Member
I was under the impression that you required more psi the lower the profile of the tyre, relative to the standard tyre and wheel spec.
Lower profile means stiffer tyre construction, but needs higher pressure for proper inflation, or your rim will hit the road on bumpy surfaces/holes.
So if its say 28 psi for a 195 70/14, you would be at approx 32 psi if you changed to a 195 50/16.
I remember reading something like that many years ago, and Ive never read anything since to contradict it.
Lower profile means stiffer tyre construction, but needs higher pressure for proper inflation, or your rim will hit the road on bumpy surfaces/holes.
So if its say 28 psi for a 195 70/14, you would be at approx 32 psi if you changed to a 195 50/16.
I remember reading something like that many years ago, and Ive never read anything since to contradict it.
So what pressure (cold) do you run at and what tyres?
I don't think Moggy will damage his wheels at 27psi (cold).
As usual I'm going from my experiences and a lot of my decision is based on grip.
arcdef
Club Member
hmm, i have done some research and apparently Toyo use a different release agent which means they need 500+ miles to break in. Hopefully it improves, gone from having buckets of confidence to feeling scared to accelerate.
34psi was definitely too high as it felt like I had power steering lol. Cant find any info on calulations I could do based on tyre size and vehicle weight, must be something out there.
34psi was definitely too high as it felt like I had power steering lol. Cant find any info on calulations I could do based on tyre size and vehicle weight, must be something out there.
Just found this but it is for trackdays. I found my A048s were best at 25 cold which equated to 30 hot (yes they got very hot) and that is bang in the middle of what they recommend (29-31 hot).
https://trackdays.ie/track-day-tyre-pressures-set/
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Who told you that? F1 cars run low 20s psi.
Paul_S
Club Member
I don't recall - it was a long time ago! I'm not sure F1 tyres are made the same way as road tyres.
Perhaps it's just that pressures are more critical with wider tyres so you get a good contact patch and more even wear?
What did you give them?
With wider tyres I reckon the most important thing is to have suspension that keeps them flat on the road under most conditions.
toopy
Club Member
Ive always run mine at 30 psi, 32 maybe on longer trips with motorway travel, my tires are 225 50/16 although they were 205 60/14 until last year.
