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Technical Tyre sizes, how wide can I go?

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Technical Tyre sizes, how wide can I go?

FiatFleetFamily said:
I have the factory option 17" wheels on mine. They are a 7J x 17 size. Standard tyres are 205/45/88V, no doubt could go to 215 or 225 where allowed, but its not the width, its how different the multipla handles on 17's compared to the standard 15's.

My turn in/out is very sharp. Tracking is set differently and they fill the wheel arch better. From a viewpoint, the multipla sits on the road better on 17's than 15's in my opinion. Good rubber also makes a good point also.

As to ride, the 15's are soft and comfortable, where as the 17's are not hard ride by any means, yes you can feel uneveness in a road / pot hole comapared to a standard wheel, but i prefer it as you get more feedback from the steering, thus the steering is not lifeless and numb.
Click to expand...

Sorry missed this, great thanks, I'm convinced and already searched ebay for anything Fiat 17", lol
 
hastingsmum said:
. . . already searched ebay for anything Fiat 17" . . .
Click to expand...
Make sure the Wheels you go for have the correct Centre-Bore size of 58.1mm, and you'll also need to be aware of the Wheel's 'Offset' (the distance from the Rim centre-line to the Hub Face).
A bigger Bore can be accommodated with Spigot Rings, but a smaller one simply won't fit the Hub.
You also need to make sure the PCD (Pitch Circle Diameter) of the Bolt holes matches, although the majority of Fiat/Alfa Wheels are the same at 4 x 98 (four Bolts on a 98mm Diameter Circle).

Here's a handy guide for finding same/similar size fittings . . .
PCDs/Bores/Offsets etc

And what it all means . . .
Wheel terms explained

Edit; Oh, one more thing.
Different wheels may have thicker/thinner middles than what you have.
The Coupe Wheels I got for mine are approx 15mm thicker, so the original Bolts wouldn't engage the Hub threads.
There's a danger that if the difference was less, you may get the original Bolts to fit, but not have enough length for strength/safety.
Check by pushing a Bolt through the Wheel off the Car, you want at least 20mm of threads showing.
If you're going from a thicker Wheel to a thinner one, you'll need shorter Bolts, the ones for my Coupe Wheels stop the Wheel turning if I try to use them on the original Wheels, due to them sticking out the back and catching on the Suspension components.
 
Last edited:
BikeDoc said:
Make sure the Wheels you go for have the correct Centre-Bore size of 58.1mm, and you'll also need to be aware of the Wheel's 'Offset' (the distance from the Rim centre-line to the Hub Face).
A bigger Bore can be accommodated with Spigot Rings, but a smaller one simply won't fit the Hub.
You also need to make sure the PCD (Pitch Circle Diameter) of the Bolt holes matches, although the majority of Fiat/Alfa Wheels are the same at 4 x 98 (four Bolts on a 98mm Diameter Circle).

Here's a handy guide for finding same/similar size fittings . . .
PCDs/Bores/Offsets etc

And what it all means . . .
Wheel terms explained

Edit; Oh, one more thing.
Different wheels may have thicker/thinner middles than what you have.
The Coupe Wheels I got for mine are approx 15mm thicker, so the original Bolts wouldn't engage the Hub threads.
There's a danger that if the difference was less, you may get the original Bolts to fit, but not have enough length for strength/safety.
Check by pushing a Bolt through the Wheel off the Car, you want at least 20mm of threads showing.
If you're going from a thicker Wheel to a thinner one, you'll need shorter Bolts, the ones for my Coupe Wheels stop the Wheel turning if I try to use them on the original Wheels, due to them sticking out the back and catching on the Suspension components.
Click to expand...

:eek:I knew about the pcd as I was once going to have some Civic wheels fitted and they needed wobble bolts but off set and centre bore size was all new to me. Thanks for the links I have read them and it seems less daunting already...
Now off to check pennies...;)
 
The Centre Bore is very important.
Modern cars have what's called 'Hub Centric' Wheels, where the Wheel is centred by, and the weight of the car is taken through, the Hub, via the Centre Boss (the shoulder the Wheel Bore fits onto).
The Bolts hold the Wheel in place, and take some cornering loads.

Older cars (e.g. my Daughter's '71 Beetle) are 'Lug (Bolt) Centric', the Wheel Bolts (or Studs and Nuts) centre the Wheel, and take all the weight and cornering loads.
That's why the Bolts on the Beetle are larger diameter than those on the Multi, despite it being around half the weight.
 
BikeDoc said:
The Centre Bore is very important.
Modern cars have what's called 'Hub Centric' Wheels, where the Wheel is centred by, and the weight of the car is taken through, the Hub, via the Centre Boss (the shoulder the Wheel Bore fits onto).
The Bolts hold the Wheel in place, and take some cornering loads.

Older cars (e.g. my Daughter's '71 Beetle) are 'Lug (Bolt) Centric', the Wheel Bolts (or Studs and Nuts) centre the Wheel, and take all the weight and cornering loads.
That's why the Bolts on the Beetle are larger diameter than those on the Multi, despite it being around half the weight.
Click to expand...

I had no idea there was a difference (and one of my mum friends has a G reg Beetle)
Thanks for explaining!
 
hastingsmum said:
Sorry missed this, great thanks, I'm convinced and already searched ebay for anything Fiat 17", lol
Click to expand...

If you can get hold of, get factory Multipla Alloys, both 17", no fiddling around with bolts and spacers.

Multipla 2010 Alloys.png

Multipla 2008 Alloys.jpg

Good Luck.
 
Not my Multi, just one on google images, but gives you and idea how the Multi sits on factory 17" alloys. Same colour as mine with the same wheels.

Black Multi.jpg
 
Last edited:
Re: Tyre sizes.

Presumably then `Alfa’ centre caps & `Speedline’ stickers make them “Alfa” alloys?

They’re not “Alfa” alloys, neither are they “Speedline” – they’re “Borbet” alloys … that have been fitted to an Alfa!

301541Z
 
You could argue that most wheels are only referred to in relation to the Vehicle they're fitted on, how many car manufacturers actually make their own wheels (or many other components for that matter)?
 
I'd imagine it would be the same as for the 15" wheels, at 43mm.
Some sites quote a range of offsets for the whole range of models and years, such as 35mm to 45mm.
Best bet would be to ring/e-mail a few Alloy suppliers and ask.

If you're keeping the overall tyre diameter the same (using lower-profile tyres), then an offset range of 10mm isn't going to matter.
 
Given commonality with the Brava/o & Marea – then ET43 looks promising.
But they’ll be quite a wide envelope of possible solutions – e.g. Stilo? ET41?

My Multipla OH is the 11/2007 1st ed – that doesn’t appear to give ET.

On the argument that “most wheels are only referred to in relation to the Vehicle they're fitted on” – car manufacturer’s are `assembly plants’ but there’s a clear distinction between wheels to be found on FIAT drawings & parts lists and those that aren’t.

One might perhaps expect an eBay seller to claim they have genuine “Alfa” wheels. Whereas in a reversal of that scenario, the buyer would have us believe she’s bought “Alfa” wheels – when the seller actually made it clear they’re not.

282020Z
 
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