just installed another set, $1180 mounted/balanced. 245/45ZR18 front. 275/40ZR18 rear. factory placard says 28 psi front and 33 psi rear. add 4 psi for sustained high speed. tire placard says 51 psi max. i have been experimenting with pressure and 28 front is a limo smooth ride but destroys the shoulders of the tire. anything less than 35 in the rear and im looking at 15k miles or less for a set. at 40psi front and rear i have seen 27 mpg. at factory specs 28/33 front/rear 24 mpg. has anyone found the "zen" pressure that gives the best of both worlds. im seeking an even # front and rear to make it easy for the wife, im in afghan for 9 months of the year and she has to keep them serviced.
Quote:
For street I use 35F and 30R Still rides good, and I don't go up in smoke with the right pedal.Originally Posted by AH1W-COBRA
just installed another set, $1180 mounted/balanced. 245/45ZR18 front. 275/40ZR18 rear. factory placard says 28 psi front and 33 psi rear. add 4 psi for sustained high speed. tire placard says 51 psi max. i have been experimenting with pressure and 28 front is a limo smooth ride but destroys the shoulders of the tire. anything less than 35 in the rear and im looking at 15k miles or less for a set. at 40psi front and rear i have seen 27 mpg. at factory specs 28/33 front/rear 24 mpg. has anyone found the "zen" pressure that gives the best of both worlds. im seeking an even # front and rear to make it easy for the wife, im in afghan for 9 months of the year and she has to keep them serviced.
Drag, I go 40F and 22R
Road course, I use 42F 35R
Anything less than 32F, IMHO doee NOT support the weight and the tires roll over too much, think sidewall wear here.
Good luck
PS: I have NEVER seen any change in gas mileage with tire pressure higher than 35F, just a rougher ride.
Senior Member
Quote:
has anyone found the "zen" pressure that gives the best of both worlds. im seeking an even # front and rear to make it easy for the wife, im in afghan for 9 months of the year and she has to keep them serviced.
Cobra,Originally Posted by AH1W-COBRA
...has anyone found the "zen" pressure that gives the best of both worlds. im seeking an even # front and rear to make it easy for the wife, im in afghan for 9 months of the year and she has to keep them serviced.
No say about racing condition, not even close to Marty does.
But for regular driving I use around 32F and 35R.
35 psi is the design/working pressure for manufacturer to test and mark the load rate. Means if you want the front 245/45ZR18 96W to take 710Kg load you need pump it to 35 psi at least. If it is under 35 psi, the less psi the less load it could take, plus too low pressure lead to shoulder worn as you mentioned.
To play it safe, I use 35 psi as a number to play around, only under or over 2-3 psi on regular driving. I do use caliper to check tire worn (wheel runout too) everytime I change summer to winter or vise versa. For my setting I don't see unusual worn. I feel comfortable without bouncing around. For me I never go under 30 psi which I think is under pressure and not acceptable.
By the way if you want to drive very fast you need put more pressure than 35 psi to take designed load as you need more pressure to compensate the higher speed.
According to my pressure setting I couldn't see much difference in mpg.
Thanks.
Howard
Quote:
No say about racing condition, not even close to Marty does.
But for regular driving I use around 32F and 35R.
35 psi is the design/working pressure for manufacturer to test and mark the load rate. Means if you want the front 245/45ZR18 96W to take 710Kg load you need pump it to 35 psi at least. If it is under 35 psi, the less psi the less load it could take, plus too low pressure lead to shoulder worn as you mentioned.
To play it safe, I use 35 psi as a number to play around, only under or over 2-3 psi on regular driving. I do use caliper to check tire worn (wheel runout too) everytime I change summer to winter or vise versa. For my setting I don't see unusual worn. I feel comfortable without bouncing around. For me I never go under 30 psi which I think is under pressure and not acceptable.
By the way if you want to drive very fast you need put more pressure than 35 psi to take designed load as you need more pressure to compensate the higher speed.
According to my pressure setting I couldn't see much difference in mpg.
Thanks.
Howard
THANKS HowardOriginally Posted by haoz129
Cobra,No say about racing condition, not even close to Marty does.
But for regular driving I use around 32F and 35R.
35 psi is the design/working pressure for manufacturer to test and mark the load rate. Means if you want the front 245/45ZR18 96W to take 710Kg load you need pump it to 35 psi at least. If it is under 35 psi, the less psi the less load it could take, plus too low pressure lead to shoulder worn as you mentioned.
To play it safe, I use 35 psi as a number to play around, only under or over 2-3 psi on regular driving. I do use caliper to check tire worn (wheel runout too) everytime I change summer to winter or vise versa. For my setting I don't see unusual worn. I feel comfortable without bouncing around. For me I never go under 30 psi which I think is under pressure and not acceptable.
By the way if you want to drive very fast you need put more pressure than 35 psi to take designed load as you need more pressure to compensate the higher speed.
According to my pressure setting I couldn't see much difference in mpg.
Thanks.
Howard
Quote:
No say about racing condition, not even close to Marty does.
But for regular driving I use around 32F and 35R.
35 psi is the design/working pressure for manufacturer to test and mark the load rate. Means if you want the front 245/45ZR18 96W to take 710Kg load you need pump it to 35 psi at least. If it is under 35 psi, the less psi the less load it could take, plus too low pressure lead to shoulder worn as you mentioned.
To play it safe, I use 35 psi as a number to play around, only under or over 2-3 psi on regular driving. I do use caliper to check tire worn (wheel runout too) everytime I change summer to winter or vise versa. For my setting I don't see unusual worn. I feel comfortable without bouncing around. For me I never go under 30 psi which I think is under pressure and not acceptable.
By the way if you want to drive very fast you need put more pressure than 35 psi to take designed load as you need more pressure to compensate the higher speed.
According to my pressure setting I couldn't see much difference in mpg.
Thanks.
Howard
ill go with "36psi" front and rear. never really understood why somthing so critical as pressure is branded on the tire in the smallest possible text?. knowing that the manufacturer uses a standerdized pressure was great info and at 36psi any wear will be considered normal and not due to under/over inflation.Originally Posted by haoz129
Cobra,No say about racing condition, not even close to Marty does.
But for regular driving I use around 32F and 35R.
35 psi is the design/working pressure for manufacturer to test and mark the load rate. Means if you want the front 245/45ZR18 96W to take 710Kg load you need pump it to 35 psi at least. If it is under 35 psi, the less psi the less load it could take, plus too low pressure lead to shoulder worn as you mentioned.
To play it safe, I use 35 psi as a number to play around, only under or over 2-3 psi on regular driving. I do use caliper to check tire worn (wheel runout too) everytime I change summer to winter or vise versa. For my setting I don't see unusual worn. I feel comfortable without bouncing around. For me I never go under 30 psi which I think is under pressure and not acceptable.
By the way if you want to drive very fast you need put more pressure than 35 psi to take designed load as you need more pressure to compensate the higher speed.
According to my pressure setting I couldn't see much difference in mpg.
Thanks.
Howard
Newbie
I run a fleet of S500/S430 4Matics for my limo company in NY Metro. I run stock-size Pilot Sport A/S+ at 35psi cold and am getting 65-70K life out of the tires. I think that's pretty good for NYC area road conditions. You should do better on CA freeways. S/F from a 53Echo Crewchief!
Senior Member
Nice. You are in the postion being able to tell the cost difference between brands and models. I believe you got a very good balance from Pilot Sport A/S.
One thing I want to bring up, Michelin Pilot Sport A/S is in All Season catagory and Bridgestone Potenza RE050A the OP mentioned is Summer tire. RE050A will deliver better sporty performance than all seasons, hence not as good as All Seasons to handle winter.
I use Summer/Winter setup which gives the best performance in summer and safety/grip in winter. But it's too complex for a fleet I know.
Model wise Michelin Pilot series are the best worth considering: Pilot Sport, Pilot Sport PS2, now Pilot Super Sport. I still have a set of Pilot Sport for front and two sets of PS2, Super Sport for rear. They are quiet and smooth.
Bridgestone RE050 series are great too. They are very well built and do last. I still have set of RE050 (245/45R18, 265/40R18) and you can feel the quality. They are great both in wet and dry.
Above tires are all performing well and pull my S600 like on rails in every road/driving (winter excluded) condition.
Michelin Pilot Sport PS2 is a problematic child though which grows cracks after years that's the only thing need watch out.
Anyway Michelin and Bridgestone are two brands I will use as they really gave me worry free. Very, very, very good quality.
Thanks.
Howard
One thing I want to bring up, Michelin Pilot Sport A/S is in All Season catagory and Bridgestone Potenza RE050A the OP mentioned is Summer tire. RE050A will deliver better sporty performance than all seasons, hence not as good as All Seasons to handle winter.
I use Summer/Winter setup which gives the best performance in summer and safety/grip in winter. But it's too complex for a fleet I know.
Quote:
Originally Posted by SECguy
I run a fleet of S500/S430 4Matics for my limo company in NY Metro. I run stock-size Pilot Sport A/S+ at 35psi cold and am getting 65-70K life out of the tires. I think that's pretty good for NYC area road conditions. You should do better on CA freeways. S/F from a 53Echo Crewchief!
Model wise Michelin Pilot series are the best worth considering: Pilot Sport, Pilot Sport PS2, now Pilot Super Sport. I still have a set of Pilot Sport for front and two sets of PS2, Super Sport for rear. They are quiet and smooth.
Bridgestone RE050 series are great too. They are very well built and do last. I still have set of RE050 (245/45R18, 265/40R18) and you can feel the quality. They are great both in wet and dry.
Above tires are all performing well and pull my S600 like on rails in every road/driving (winter excluded) condition.
Michelin Pilot Sport PS2 is a problematic child though which grows cracks after years that's the only thing need watch out.
Anyway Michelin and Bridgestone are two brands I will use as they really gave me worry free. Very, very, very good quality.
Thanks.
Howard
