Fitting wheels with larger centre bore

donvanfleet

re: "studs are designed only to act in tension":
That's 100% correct. But, the vertical loads are not carried at the point the wheel (almost) touches the hub. The vertical loads are transferred ENTIRELY by friction, i.e. between the wheel and the backplate. My only advice is don't grease you backplate !
The horizontal force from the studs creates the required frictional resistance (at 90 degrees). The bolts can only go into bending mode if this frictional resistance force is exceeded and the bond breaks (e.g. via a large impact). However, if you hit something that hard, your tyre would already be flat and your wheel would probably be in a sad state too. The gap between your wheel and your hub would be pretty academic in these circumstances.
The fact that nuts are tapered means they tend to centre the wheel automatically. I always spin my wheel and tighten incrementally to help with centreing. If your wheel isn't centred properly, you will feel it as soon as you go any any speed.
hope this helps

Joe_Horner

donvanfleet wrote: »

re: "studs are designed only to act in tension":
That's 100% correct. But, the vertical loads are not carried at the point the wheel (almost) touches the hub. The vertical loads are transferred ENTIRELY by friction, i.e. between the wheel and the backplate. [...]
The horizontal force from the studs creates the required frictional resistance (at 90 degrees). The bolts can only go into bending mode if this frictional resistance force is exceeded [...]
The fact that nuts are tapered means they tend to centre the wheel automatically. I always spin my wheel and tighten incrementally to help with centreing. If your wheel isn't centred properly, you will feel it as soon as you go any any speed.
hope this helps

Interesting thread revival and an unusually technically accurate first post - welcome to MSE!!!

Richard53

donvanfleet wrote: »

The vertical loads are transferred ENTIRELY by friction, i.e. between the wheel and the backplate. My only advice is don't grease you backplate !

That's a very good point. I think most 'greasers' would only advocate a thin smear of grease, just enough to prevent the two metals sticking, rather than lubing it up like a 60s quiff. But worth bearing in mind.

marlot

Just as a final update. In the end I sold the old wheels on eBay, and bought new ones. The old wheels (with decent winter tyres) fetched a good price - I timed the sale just as the weather was turning at the end of November.

red_eye

marlot wrote: »

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?

they can be used but unless you can get them centered its not going to be nice to drive