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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old Today, 03:35 AM
Maxi P Maxi P is offline
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Location: Darwin, NT, Australia
 
Join Date: Jun 2013
Posts: 42
Mein Auto: E36 328i convertible
What's the max tyre height you would run on a 17"?

Hi,

I scraped going over the pits today.

They said I was bad.
It made me sad.
Because I like my springs way down low.

So, I need clearance. I also need new tyres. I'm running 225/45/17 all round and I'm thinking of going to a 225/55 to get me over the rail.

Is that stupid???

I like to think I'm not a stupid man, but stupid is as stupid does!

The back story is;

She was low when I bought her in 2013 and she scrapped over this same inspection pit the first time around, and was leaning on the driver's side. So I replaced the springs with another low set and she rolled over (just!) but hey! no scrape - no problem. Then we moved interstate and she passed again in 2014. Now I'm back here again, nothing has changed except she's 50,000 kms sexier and scraping again.

However, her tyres are thin (one of them failed inspection!), I have no idea what pressure they are, and I reckon if I get new ones with a higher side wall she'll be rolling through there like, "chicka-chickahhhh!"

What do you guys reckon?

How high should I go??

Is 55 too much? Is 50 too much??

How much is too much and such?
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'97 E36 328i Manual M Sport Highline Convertible
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  #2  
Old Today, 07:28 AM
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ZeGerman ZeGerman is offline
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Location: Seattle, WA
 
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Mein Auto: 1998 BMW 328is
You shouldn't be attempting to alter ride height by changing tire size. Make your ride height changes by changing the springs. Also going from a 225/45 to a 225/55 will throw your speedometer off by around 6.62%.
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  #3  
Old Today, 08:42 AM
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Moeman10 Moeman10 is online now
hookersandblow
Location: Cincinnati, Ohio
 
Join Date: Apr 2009
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Mein Auto: '99 M3
Quote:
Originally Posted by ZeGerman View Post
You shouldn't be attempting to alter ride height by changing tire size. Make your ride height changes by changing the springs. Also going from a 225/45 to a 225/55 will throw your speedometer off by around 6.62%.
Not only that, but a taller sidewall will cause rubbing issues with the fender or strut housing.
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  #4  
Old Today, 09:11 AM
bluptgm3 bluptgm3 is offline
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Location: Seattle
 
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Mein Auto: 99M32
....not to mention comparable percentage change to final drive gearing...which is reflected in you speedometer reading... Changing the rears only? You want to be careful of gross mismatch in front to rear diameter, as it can 'play' with ASC.
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