Wider lower profile tyres = lower pressure?

[photoshop]

a PSI of 30-35 should do the trick

 

[MikeHunt79]

Keep the pressure the same I would

/yoda

 

[M0T]

Do you work for Halfords?

Or Kwik-fit, that is if they have worked out how to use computers in there.

 

[Zuma]

You are a professional and you think that the wrong rolling radius is 'not your problem' and feel its good to ask on OcUK about tyre pressures?

Who do you work for so that we may ensure we never, ever use their services?

Jeez...

I do hope you are not charging your customer for this bodge work?

don't worry foxy, the chances of you ever using our 'services' are slim

i think i will keep you all guessing for a bit longer, but none of you are even close on any counts so far

 

[Ben M]

don't worry foxy, the chances of you ever using our 'services' are slim

i think i will keep you all guessing for a bit longer, but none of you are even close on any counts so far

A main dealership of some kind, one that isn't BMW.

 

[Siliconslave]

don't worry foxy, the chances of you ever using our 'services' are slim

i think i will keep you all guessing for a bit longer, but none of you are even close on any counts so far

Vauxhall dealer?

 

[Gaygle]

i heard that you should inflate them to the levels the original tyres were.

 

[Ben M]

doesn't it usually say on the tyres themselves anyway?

 

[InvaderGIR]

106?

The one that can do 150mph with one hand on the wheel...whilst turning?

InvG

 

[Zuma]

i heard that you should inflate them to the levels the original tyres were.

on the one hand a lower profile would suggest using higher pressure to make sure you don't damage the rims.
on the other hand the contact patch is related to the pressure of the tyre rather than the width of it. eg, a wider tyre at the same pressure would theoretically have the same contact patch area at the same pressure. so in order to benifit from the wider tyre you need to lower the pressure to get more of the rubber in contact with the ground.

in the end i chose slightly lower pressure.

 

[Locky]

i put some 205/40/17 on my astra, from 185/65/15, I inflate them to 32PSI

So id say 30-35 psi is plenty.

 

[Confused]

<snip> drivel </snip>

No, as I stated earlier, YOU INFLATE THEM TO THE MANUFACTURER'S STATED PRESSURE!!!

 

[Gaygle]

No, as I stated earlier, YOU INFLATE THEM TO THE MANUFACTURER'S STATED PRESSURE!!!

 

[Zuma]

No, as I stated earlier, YOU INFLATE THEM TO THE MANUFACTURER'S STATED PRESSURE!!!

maybe just stating it isn't enough. you gave me no reason to listen to you over anyone else. no explanation as to why this would be correct or why your opinion is valuable.
and the car was gone before i got any useful replies.

 

[2Thumbs]

Tyre pressure stays the same.

PSI means Pounds per Square Inch so it doesn't matter what size tyres the air's going in IIRC.

I do 33 front, 30 back. but it varies between cars.

 

[Freefaller]

If you're not going to heed to people's advice why ask people in the first place?

 

[[TW]Fox]

So you let a customer leave after you did work on his car which means his speedo now underreads so badly that he will prob get gatso'd?

 

[Jez]

This commically bad, i hope you advised the customer of the speedo error and the fact his tyre pressures may not be correct.

Jeeez, and people call ME a dodgy businessman :/

 

[Zuma]

If you're not going to heed to people's advice why ask people in the first place?

which advice should i have heeded?

 

[Zuma]

So you let a customer leave after you did work on his car which means his speedo now underreads so badly that he will prob get gatso'd?

yes i did.
i did what the customer asked for. and he is fully aware of the situation.
unlike you.