Upsizing wheels on Fiat Ducato - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 6 (permalink) Old 23-02-2021, 08:35 Thread Starter
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Upsizing wheels on Fiat Ducato

Hi there!
Any help or advice appreciated thanks.
I have the standard 15" Rims with 215/70/16c tyres for a Fiat Ducato 2008 2.3 JTD.
I would like bigger rims and bigger tyres.
Basically for better looks! But I want to make sure it's not going to be dangerous.

Now 5x118 16" Rims are hard to find in Australia and too expensive to order online.

So I found these bolt adaptors on ebay that apparently convert any 5x120 rims to fit the Ducato.

Has anyone had experience with these?

https://www.ebay.com.au/itm/BMW-Whee...72.m2749.l2649

So I've bitten the bullet and ordered some of these - Also I found on online a cheap set of VW Amarok 16" Rims at 5x120. These already have tyres on them, but they are alot bigger than what I currently have. These are 245/70/16 - and they are not C rated tyres but do have a high load capacity as made for 4wd.

I've found a few posts online where people have used these large 4WD tyres successfully on their Ducatos. They do look cool - but are they safe?

Perhaps i should order some new lower profile tyres? Like 215 60 16s? But they won't look as cool!

Any advice appreciated!

Thank you.

Last edited by Ollie Jacobs; 23-02-2021 at 08:36. Reason: Mistake
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post #2 of 6 (permalink) Old 23-02-2021, 09:23
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Welcome to MHF but....

Changing wheels to "look cool" does not seem justification for such a task.

My reservations;

1. Presumably your insurance company has been asked as it makes the vehicle very different from the approved specifications,

2. Have you checked with that company on eBay as they suggest in red at the bottom,

3. Will such changes alter the actual v indicated speed ? Changing the wheel diameter will mean the vehicle is going faster than the speedo indicates, the Police and the vehicle approval authorities might cancel approval, hence no insurance,

4. Presumably you are in Australia, judging from your comments and the eBay.link, are vehicle Construction and Use Regulations more flexible there than in the U.K. ? I somehow doubt that.

5. I would be very surprised if ANYONE on here would approve such an adaptation to "look cool" due to potential liability claims.

Sorry that is not what you want to read, but I doubt the safety and wisdom of your suggested actions.
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post #3 of 6 (permalink) Old 23-02-2021, 10:58 Thread Starter
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Thanks for sharing your wisdom - the insurance hurdles could definitely be an issue if the modification is illegal.
But from my research into this sizing it is legal is some states of Aus (must not exceed 25mm width difference from manufactures specs unless approved).

I don't think I'm the only one who likes good looking rims and tyres on cars or vans.

The reason I am putting this onto a forum is to discuss the safety issues with doing so in pushing the size limits / trade off with performance etc.

If you have some facts or experience in doing so please share. No one is liable in sharing thoughts or opinions on a forum or the world would go to hell lol.

So back to the main question - Has anyone had experience using the bolt adapters available on ebay to convert 5x120 to 5x118?

Cheers

Last edited by Ollie Jacobs; 23-02-2021 at 11:03.
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post #4 of 6 (permalink) Old 23-02-2021, 12:33
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I have no actual experience of the items you suggest
Disregarding the legality or insurance aspects my opinion on the subject.

I see from the advert they actually call them "wobbly bolts" and then looking at the item descriptions it seems that you get a new set of bolts, obviously the right size diameter and thread pitch along with what is basically a ring of aluminium, which has the i.d. to suit the Ducato hub and the o.d. to suit the wheel you mention.
I'm guessing here that the bolts will be longer in overall length and with a seat taper that will not match the wheel completely but allow enough "slack" to enable you to fit the bolts on the wrong mismatched hub to wheel p.c.d.

What weight is your version of the Ducato?
Will the wheels you propose be adequate in strength for the weight of your van?

I'm guessing that they are legal for use in UK as it's a UK company selling them but I would most definitely not want to trust a conversion such as that on my motorhome.
I make that comment from a lifelong engineering experience.


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post #5 of 6 (permalink) Old 23-02-2021, 15:46 Thread Starter
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Quote:
Originally Posted by eurajohn View Post
I have no actual experience of the items you suggest
Disregarding the legality or insurance aspects my opinion on the subject.

What weight is your version of the Ducato?
Will the wheels you propose be adequate in strength for the weight of your van?

.
Thanks John.
My Ducato is about 3.3 tonne I recall. The wheel rating for the VW Amarok 16" rims and tyres Im looking at cover about 4.4 tonne.
Yes I agree - using PCD adapters makes me nervous/ Hence seeing if theres someone that has tried them.
Thanks for your input!
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post #6 of 6 (permalink) Old Yesterday, 15:28
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If you fit them to the front it will widen the track slightly and that will alter the Ackerman angle when you are steering. You wonít notice it when driving, but it will speed up the tyre wear somewhat.

Itís explained in the below link
https://en.m.wikipedia.org/wiki/Acke...ering_geometry

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It's who you share the journey with (even if like me, itís in a caravan!)
I am very fortunate to have Mrs Plodd to share mine with
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