225/40/18 to 225/45/18

[Penguin]

Morning all,
Quick question regarding tyre profiles. Where I work they have kindly introduced speed humps in the car parks. My lowered Leon now scrapes slightly as I go over them. The humps are the kind with spring loaded "teeth" on them so it's these "teeth" that are catching.
Currently have 225/40/18 fitted and was thinking of moving to 225/45/18 to give me a touch more clearance.
Has anybody done this? I've read bits about this affecting speedo readings etc.
Or am I worrying about nothing with regards to the car catching on these humps.
Thanks in advance.

 

[Daniel M]

Depends what's catching really?

 

[Fishy]

Or maybe raise the car a little.

Fish

 

[Penguin]

Or maybe raise the car a little.

Fish

That's why I was looking at slightly higher profile tyres.
Or is there another way I'm overlooking?

 

[bete noir]

By my calcs that would raise the car by about 12mm, and give you a difference in speedo reading of around 4% (the speedo would read slow). Going to higher profile tyres would change the gearing also, is this something you want?

I would consider changing the springs, assuming that is how it has been lowered. Or fit coilovers to give 'proper' ride height adjustment.

 

[Dan FR]

The springs are designed to simply brush gently along the tyre/bottom of the car. So long as you don't reverse or roll backwards I would say you're worrying over nothing and they won't cause any damage

 

[Penguin]

The springs are designed to simply brush gently along the tyre/bottom of the car. So long as you don't reverse or roll backwards I would say you're worrying over nothing and they won't cause any damage

I'll try and check when it's not busy there to if I can see what's catching. Hopefully you're right.