Fitting wheels with larger centre bore

marlot

We're thinking of moving on from the wife's Jazz. Probably to a Yaris.

We have a set of steel winter wheels. I am trying to work out if it would be safe to fit them to the yaris.

The two cars have the same PCD and close enough offset.

But ... the Jazz has a centre bore of 56.1, the yaris centre bore is 54.1 (both from this useful website www.wheelfitment.eu/)

The wheels are 14" so may not fit over the calipers. But I can try them easily enough.

How important is the centre bore with a steel wheel?

facade

Opinions differ.
In today's H&S, litigation centred world, I would have to say that they should not be used.

In The Olden Days, wheels were centred by the cone shaped nuts in the holes. Nowadays, they are centred, as you know, by the centre bore, so you would expect that simply fitting nuts with the correct taper for the steel wheel would do the job, and if it ran out a smidgeon, you could just put up with it. (I would )

However, and this is where opinion divides, The tight fitting centre bore actually carries the weight of the car, and the nuts stop the wheel falling off.
Apparently, removing the centre support will put the wheelstuds under stresses that they were not designed for, and they are so poorly made that they will bend somehow (don't ask me how they can bend if the nut is right at the bottom) and even shear off!

Personally, I think this is scare mongering, I can see a point with massively thick alloys, but not with 1mm of steel, however, best to get the correct wheels for the car.

Also there is the possibility that your insurance may use the wrong wheels as an excuse to wheedle out of paying a claim.

Flying-High_2

Simples.... 2mm Spigot Rings. The 54.1 Yaris Hub +a 2mm Spigot ring = 56.1

Alter_ego

Flying-High wrote: »

Simples.... 2mm Spigot Rings. The 54.1 Yaris Hub +a 2mm Spigot ring = 56.1

Are you sure 2mm spigot rings wouldn't be 58.1? You add 2mm to both sides if they're 2mm thick.

Bongles

facade wrote: »

However, and this is where opinion divides, The tight fitting centre bore actually carries the weight of the car, and the nuts stop the wheel falling off.
Apparently, removing the centre support will put the wheelstuds under stresses that they were not designed for, and they are so poorly made that they will bend somehow (don't ask me how they can bend if the nut is right at the bottom) and even shear off!

Without commenting on the OP's question specifically, can I just clarify your engineering - if a component fails under a load it was not designed for, that is not evidence that the component was poorly made.

Flying-High_2

Alter_ego wrote: »

Are you sure 2mm spigot rings wouldn't be 58.1? You add 2mm to both sides if they're 2mm thick.

Quite Correct Yes.... Shall I try again?.... The OP will needs 56.1 to 54.1 Spigot ring......

colino

With the wheel bolts providing the concentricity the minor difference in the bore is irrelevant in engineering terms. After all it is the bolts that are providing the mechanical clamping force to keep the wheel in place, it doesn't rely on the hub shoulder to lean on.

photome

Flying-High wrote: »

Quite Correct Yes.... Shall I try again?.... The OP will needs 56.1 to 54.1 Spigot ring......

set for £9.99 on ebay, other retailers available

facade

Bongles wrote: »

Without commenting on the OP's question specifically, can I just clarify your engineering - if a component fails under a load it was not designed for, that is not evidence that the component was poorly made.

Quite correct, my bad

That phrase should read
"and as modern components are so precisely engineered to just perform a specific function, and no more, over a relatively narrow range of operating conditions they will bend somehow"

The crux is the studs are designed to be solely in tension, and removing the centre support subjects them to a shear force as well.

Personally, I can't see a problem, but that doesn't mean that I can suggest someone else fits the "wrong" wheels.

Safest is the correct wheels from a lower spec'd model, followed by a converter, but I suspect this will be a real pain to get off in the Spring, and will end up being destroyed.

Basil74

Flying-High wrote: »

Simples.... 2mm Spigot Rings. The 54.1 Yaris Hub +a 2mm Spigot ring = 56.1

I've just bought a new set of wheels for my car and they came with a set of spigot rings, but the rings won't snugly fit into the wheel without probably having to use a hammer and block of wood to 'encourage' them in.

Is this how they should be or should they just slide in without any effort??

forgotmyname

Basil74 wrote: »

I've just bought a new set of wheels for my car and they came with a set of spigot rings, but the rings won't snugly fit into the wheel without probably having to use a hammer and block of wood to 'encourage' them in.

Is this how they should be or should they just slide in without any effort??

A snug fit by hand with thump from the had at most. Otherwise you need to get another set or get them machined.