A lot of people overlook the importance of the fit of the wheel on the hub 'boss'.
There are basically two types of wheel fitment;
1. Lug (bolt) centric.
2. Hub centric.
The majority of modern cars will have Hub Centric wheels/hubs, where the weight of the car is taken by the central boss on the hub, which is a close fit with the bore in the centre of the wheel.
Older cars have Lug Centric fitments, such as my Daughter's '71 Beetle, where the Bolts alone take all the loading on the wheels, which explains why the Bolts are a larger diameter than the ones on my Multi, which weighs around
1450kg, as opposed to the
800kg or so of the Beetle.
I found a website a few years ago, showing what can happen when you fit wheels with too-large a bore on a car with Hub Centric wheel fitment. *see below*
Basically, the bolts eventually failed, causing major damage to the car.
As for alternative wheel fitments for the Multipla, I have Fiat Coupe wheels on mine, they're still 15", but one size wider, and need longer Bolts due to the thicker central part of the wheels.
Check here for other fitments...
Wheel PCD charts
And again...
One more
You'll notice most charts/lists show a
range for wheel offset (e.g. 30-38 or 35-42), and not just a single figure, never did find out why.
I'd guess that it shows what you
can safely fit, rather than the actual factory fitment for the particular model.
It's worth having a read through this as well...
wheel fitment explained
Note they call the central boss a
'Spigot'.
*Found it*
The importance of proper wheel sizing