Just wondering what the optimum tyre pressure is for a Zed sporting 18's. Should the tyre pressure be the same as 17's ? I just fitted a set of 18's and noticed the rear wheels aren't making as much tyre contact on the ground as the front wheels.
I'm running 18" wheels on my other car... I use anything between 32 - 38 psi depending on conditions. What psi are you running at the mo'?
Hi John >> What profile are your new tyres? 45, 40, 35.? Mine are 265x35x18 and was recommended to put between 35 - 40 psi dependant on road conditions and how you drive.:thumbsup: Cheers Mate Kerry :zlove:
fronts are 245/35, rears are 275/30 They're inflated to 32psi It's a bumpier ride, which I expected, but it also feels as though the rear is inflated above what it should be.
Is there anything......>> regarding inflation pressures on the side wall of the tyres? How about the tyre manufacturers website? I've had identically sized tyres from two different manufactureres with different inflation recomendations. A 30 series tyre is going to be a lot harsher then a 40 or 45.
Shouldn't the weight of the car be a factor in determining the appropriate tyre pressure? I thought manufactures only provided general info on pressure and or maximum pressure limits. Surely tyre pressure should be set differently in a car weighing 900kg compared to a car weighting 1,500kg or more.
Wouldn't the cars weight.....>> actually change the pressure? If you put 35psi into a tyre before you bolt it to a car does it read higher once it has the weight of the car resting on it? I might have to try that this weekend. The reason I suggested you check the manufactureres specs is that the Toyos that I have are rated at 40psi for the 235x45x17 on the front, but 44psi for the 265x40x17 on the back. The old Dunlops I had were rated at 38psi for both front and back.
Mmm, good point Yeah I think it would change the pressure, whether the difference is noticeable is another question. I might just play around with the pressure a bit on the rear tyres, the front seem fine.
Yeah of course... for a car as phat as the zed, you should have around 38 - 40psi when the tires are warm for best contact...just go for a stint, chuck on the pressure guage and go from there...my two cents anyhow
Tyre Pressures I've got 245x45x16 on the rear on standard 8.5" rims (US size) and the same size on the front on standard 7.5" rims. I got different answers at different tyre shops re pressures. In the end I tried 34psi on both. Now after the tyres were half worn I noticed that the front tyres were worn on both edges but believe that this is usual for 300's. My suspension is completely adjustable so I may play with this more. However the rear tyres were worn in the centre due I suspect to excessive aceleration causing the centres to bulge out from centrifugal forces. I now have the rears at 32psi and hope to get a longer life from them. The fronts are still at 34psi. The tyres are Toyo T1-S's. Incidentally I won't use Toyos again. I measured the tread width on a 225 S02 and found that it was wider than my 245's.
I purchased my car with SO2's all round and noticed the same I never measured the width but noticed when I had the SO2's in the rear (255) the tread was more or less flush with the rim but when I fitted Falkens ST115's (255) they were noticeably tucked (narrower).
The TRUTH about tyre pressures herein >>>> 1. Car manufacturers design suspension around specific tyre size/profile ratio as an integral component of the suspension or 'ride', primarily for comfort. [Remember Holden's old RTS- Radial Tuned Suspension hype?] 2. 32psi should be considered a minimum for a 'comfortable' ride on 16's, around town, 36 for sustained highway driving. 3. When fitting lower profile tyres, pressures must be increased to maintain a FLAT 'footprint', for both enhanced performance & wear, albeit at the expense of 'comfort'. 4. I run 38psi (min) on my 16's; those with 17's should run 38 - 40; 18's .... mmmh, circa 40 but at the expense of 'ride' comfort? 5. Safety-wise: Always check tyre pressure whilst tyres are 'cool'. Low inflation pressure causes heat build-up during sustained high speed driving, thus increasing pressure. [The lower the pressure, the more heat/pressure build-up!] OK, enuf from me. For those interested to learn more, go HERE and read up.
i know your going to think i am loopy to mention this what i use for toe in and toe out is those cheap little lasers you get on those dumpy levels from crazies or what ever. they come with a beam that is like a line. set one up on each wheel a couple of mirrors, on level concrete and you can measure very accuratley when ever you desire.
