Goodyear F1 tyre pressures

[sapper]

Hi folks, im struggling to find the correct tyre pressures for googyear eagle f1's they are 215/40/17. Can anyone point me in the right direction please??

[daz the plumber]

to narrow for the rears try 24 psi

[scotty_d]

I run these tyres on the front at around 35psi due to the low profile need to be pretty hard

[sapper]

Bit of a difference 24 - 35 PSI, Daz why do you say they are too narrow for the rears? Scotty what are you running on the rears?

Edited by sapper on Saturday 24th January 18:04

[scotty_d]

eagle f1 225/45/17 rear at around 33 front 215/40/17 as i said 35 psi and seems to wear and handle fine

[sapper]

scotty_d said:

eagle f1 225/45/17 rear at around 33 front 215/40/17 as i said 35 psi and seems to wear and handle fine

[Chimjunkie]

35 psi definitely wrong for such a light car. Tyre pressures should be in the 22-28psi range for these cars independent of profile. IMO

[stefan1200]

I asked Goodyear Germany a few years ago and they officially stated 29 psi front and rear for use on a Chim.

Stefan

[RichB]

I have Goodyear Eagle F1 GSD3 on 17" & 18" rims and I like 25 front and 26 rear, I have adjustable Nitron dampers.

Incidenatlly TVRs recomendation on the Bridgestone SO2s was 22 & 24 so pretty low...

p.s. I'd be carefull driving in the damp on 36 psi!

Edited by RichB on Saturday 24th January 22:53

[bobfather]

Chimjunkie said:

35 psi definitely wrong for such a light car. Tyre pressures should be in the 22-28psi range for these cars independent of profile. IMO

Any suggestion that 35psi is OK is simply dangerous advice, don't take it. 35psi is even too high for track use.

Scotty d, no offence meant but you must have balls of steel to be able to drive at enjoyable speeds on anything other than the smoothest of motorways at that pressure.

[scotty_d]

bobfather said:

Chimjunkie said:

35 psi definitely wrong for such a light car. Tyre pressures should be in the 22-28psi range for these cars independent of profile. IMO

Any suggestion that 35psi is OK is simply dangerous advice, don't take it. 35psi is even too high for track use.

Scotty d, no offence meant but you must have balls of steel to be able to drive at enjoyable speeds on anything other than the smoothest of motorways at that pressure.

I am not being funny but with such a low profile on the front and the state of the roads if you run to low a presure it will damage your wheels as i said i run high on the front the back is lower due to larger profile and the car is spot on wet and dry just the way i have it set up each to there own

i tried them at 28-30 psi and it felt like driving on custard. think the rule of thumb is to go up 2psi every inch depending on profile ect... so iv been told and seems to work

Edited by scotty_d on Saturday 24th January 23:50

[bobfather]

scotty_d said:

I am not being funny but with such a low profile on the front and the state of the roads if you run to low a presure it will damage your wheels as i said i run high on the front the back is lower due to larger profile and the car is spot on wet and dry just the way i have it set up each to there own

So what you're saying is that you fitted bigger rims to make your car look good and as a result you had to compromise the drivability to prevent rim bump. Hard sidewalls or over pressure lead to reduced lateral flexing. This in turn leads to increased bump steer and tram lining and significantly reduces the progressiveness of both over and under steer. At 35psi rear pressure your car will exhibit snap over steer, very dangerous, no warning and so quick that most people would not have a chance in hell of catching it.

The sidewall has to be able to move laterally to eliminate sideways effects coming from the road surface. Suspension only works up and down. The chassis needs lateral flexing and the only place it can get that is from the tyre sidewalls.

I have been around this place for many years and to date I have never heard anyone suggest such high pressures.

What is important here is that the OP gets good advice. If you want to drive your car with 35psi in your rear tyres then that's your choice. I suggest that the OP should take your advice with a fair measure of caution.

[scotty_d]

bobfather said:

scotty_d said:

I am not being funny but with such a low profile on the front and the state of the roads if you run to low a presure it will damage your wheels as i said i run high on the front the back is lower due to larger profile and the car is spot on wet and dry just the way i have it set up each to there own

What is important here is that the OP gets good advice. If you want to drive your car with 35psi in your rear tyres then that's your choice. I suggest that the OP should take your advice with a fair measure of caution.

If you re-read i said 35 in the front not rear and my car came with these 17" when i bought it and was at these pressures and has worked for prior owner, i would listen to all advise given here i am mearly stating how i have mine running and it works for me and it is not a harsh ride ect ect my car is set up for road use only and works well for me thats all, it all depends on your cars set up, tyres, profile,suspension, at the end of the day i drive my car so i set it up how i want it each to there own.

Edited by scotty_d on Sunday 25th January 00:18

[bobfather]

scotty_d said:

bobfather said:

scotty_d said:

I am not being funny but with such a low profile on the front and the state of the roads if you run to low a presure it will damage your wheels as i said i run high on the front the back is lower due to larger profile and the car is spot on wet and dry just the way i have it set up each to there own

What is important here is that the OP gets good advice. If you want to drive your car with 35psi in your rear tyres then that's your choice. I suggest that the OP should take your advice with a fair measure of caution.

If you re-read i said 35 in the front not rear

Thanks Scotty, I fear we're going round and round here. The fronts would normally be lower pressure than the rears so 35psi now sounds even worse to me. 35psi in the front will increase bump steer, tram lining and under steer. Not as dangerous as generating snap over steer but it still compromises handling in an attempt to eliminate rim bump.

[scotty_d]

I know where your coming from bob if my presure is as low as 25ish on the front it looks flat and feels horrendous and loads of tyre noise. its just not right for this particular tyre set up

[RichB]

Chaps, like Bob, I have never heard of anyone running a TVR on 35psi. There are loads of people on who do track days, self included, and race and it's just too hard. The profile of the tyre has nothing to do with it. Who ever told you the story about increasing pressure as the profile decreases was wrong. Also the appearance of a tyre has nothing to do with it, the part of the tyre that affects pressure is the stiffness of the sidewall and lower profile tyres are designed with this in mind. I don't want you to feel you are being got at but for safety sake, why not ask around on the TVRCC chat forum or somewhere to see what advice you get? Driving on overinflated tyres at the front will cause you to understeer terribly and may cause you to come off the road... Sorry...

Edited by RichB on Sunday 25th January 10:20

[wheels1]

sapper said:

Hi folks, im struggling to find the correct tyre pressures for googyear eagle f1's they are 215/40/17. Can anyone point me in the right direction please??

Silverstone Performance recommend 24 psi [front] for the same size wheel and tyre with their SP12 wheels. With their 245/35/18 rear's they say the the same presure.
You do not need to run high pressures with low profile tyres as their side walls are so much stiffer them normal profile tyres. Tyre fitters hate to fit anything less than 60 profile as they struggle to fit them because there is no flex in the tyre walls.

[Chimjunkie]

I have the Silverstone performance 17" front 18" rear with 40 profile fronts and 35 profile rears. I run 23 front and 25 rear pressures and my car handles very respectably!

As a pointer to the OP, look in the Tuscan section of this forum because these cars are around the same weight and often run 17" and 18" rims with Bridgestone F1 tyres. Those guys state between 24-28psi if you search.

[RichB]

Chimjunkie said:

these cars are around the same weight and often run 17" and 18" rims with Bridgestone F1 tyres...

or even Goodyear

[Chimjunkie]

RichB said:

Chimjunkie said:

these cars are around the same weight and often run 17" and 18" rims with Bridgestone F1 tyres...

or even Goodyear

Quack Quack oops!