Tyre Rubbing Help !!!!

[Doink]

Hi ,

If i fitted some 9"x16" ET0 with a 215/40/16 tyre To my 325i Convertible would i get rubbing. What would i do to prevent it. Rolled Arches etc, Looking to go 60/40 drop on kw V1

Cheers

Steve

[808BMW]

Re: Tyre Rubbing Help !!!!

Hi ,

If i fitted some 9"x16" ET0 with a 215/40/16 tyre To my 325i Convertible would i get rubbing. What would i do to prevent it. Rolled Arches etc, Looking to go 60/40 drop on kw V1

Cheers

Steve

I'd say the et0 equals a big old no.

[Doink]

Re: Tyre Rubbing Help !!!!

[/quote]I'd say the et0 equals a big old no.[/quote]

Can you tell me more about why these wont fit my car. I have seen alot of Euro style cars with wider wheels than 9" so whats the problem with these ones.

Cheers

Steve

[sovann]

Stock bottlecaps = 14x6, ET35. Based on that, a 16x9 ET0 wheel would be 73mm wider on the outboard side, 3.1mm wider on the inboard side and would increase your track by 70mm.

So there wouldn't be any clearance issues on the inboard side, but you'd definately need some guard work done to squeeze in an extra 73mm of width on the outboard side, and the fronts would definately rub on the fender liners at full lock. The increased track would also stuff up all the load paths in your suspension.

You'd also need to run really stiff springs.

[Doink]

Thanks that the info i was after,.

When you say the extra track will stuff up the suspension loads it get confused can you explain a bit further.

Cheers again

Steve

[sovann]

Picture is worth a thousand words...

Basically, it shows your strut/hub assembly, wheel and lower control arm. The green wheel is a stock bottlecap. The orange one is a sweet looking deep dish euro wheel.

The blue crosses are pivot points. Notice how there are three pivot points making up the system. If you look at the stock wheel and draw a line from the centre of the tyre's contact patch up to the upper pivot points, you'll see that it passes through the outboard lower control arm pivot point. This is a good thing as it means there are no bending moments in the system.

Now look at the orange wheel. If you look at the load path, it does not pass through the control arm ball joint. So when you say bottom out hard, there will be a bending moment (ie. the wheel puts leverage on the on the strut etc) and you might bend shit.

Sorry if I sound like a nerd, but I love this suspension stuff :D


edit: resized pic...

[Doink]

:shock: :shock: :shock: :shock:

Thats amazing shit, It makes perfect sense now Thanks alot mate.

Steve