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Post by wannabe on Mar 17, 2017 22:31:27 GMT
Soooo...
The missus' car's tyres are currently basically racing slicks and I fear the boys in blue will throw the book at me if they stop me in it...
15" tyres now have a crap selection in the size needed though  so I'm thinking we may as well upgrade to 17", on the basis I've been wanting to do it for a while and the choice in 17" tyres is MUCH better.
However...
It's not a common car so there's not that many standard fit 17s for sale secondhand and not that many other OEM wheels from other models from the manufacturer that swap straight on 
So, the question is - If I was to buy, say, generic alloys with the correct PCD and the correct offset, but with a centre bore of, say, 70mm that is larger than the car's centre bore of, say, 50mm, would I need spigot rings made up?
Does the sticky out but that goes into the wheels' centre bore (technical term  ) take some/most of the load or is it entirely on the wheel nuts?
As I type this I am thinking that the wheel nut threads don't look *that* strong so the centre sticky out but must need to fit the centre bore??
This is probably the dumbest post in the world but I thought it best to ask before I kill myself  lol
Thanks in advance, oh wise people!  |
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Post by Horney on Mar 17, 2017 22:38:14 GMT
The centre bore takes no load at all. The load is taken by the friction generated between the wheel and hub faces when you torque the nuts up.
As long as the wheel centres on the hub by use of tapered nuts/bolts, you do them up to the right torque and do them up in the right sequence you'll be fine. Spigot rings exist purely to help keep the wheel centralised when you do up the nuts/bolts to stop wheel wobble.
I've run without spigot rings on numerous sets of wheels over the years.
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Post by sandys on Mar 17, 2017 23:04:27 GMT
My OZ wheels have spigot rings, just helps locating the wheel on the hub.
Seemed to be a wide selection of spigot rings on ebay and I seem to recall a website that soley deals with making them.
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Post by wannabe on Mar 17, 2017 23:48:45 GMT
Awesome, thanks for the quick replies, gentlemen And some science! Even better Have pinged a message about the ones I'm looking at so hopefully I can get sorted this weekend or early next week. Points (3 per tyre) don't mean prizes when it comes to one's licence, sadly... lol |
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Post by nibnob21 on Mar 18, 2017 9:48:48 GMT
Exactly as Nick says: their function is to locate the wheel centrally, not to carry load - that's done by the clamping force generated between the hub and the wheel face. There is a lot of false information out there about spigot rings and their purpose.
Advisable? Yes. Necessary? No.
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Post by boringgit on Mar 18, 2017 10:01:55 GMT
If you really must you can buy them on ebay for pence probably. It is handy for the wheel to sit in the correct place while you do it up. More useful on something big and heavy though not a light mx5 wheel.
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Post by wannabe on Feb 19, 2022 17:14:40 GMT
I had forgotten I'd posted this thread... lol Missus' car now long gone, but having had it confirmed that my current set of winter wheels on the 5 are more 50p than 10p, I was looking at replacements for cheap money. Then I remembered I've got a set of 4x100s in the garage off another car that should fit and be close to OEM NA offset (35 or 42mm?? IIRC?) with at least 60.1 centre bore... I still struggle to get my head round how it's not just the four small bolts stopping the wheel from coming off when cornering and when crashing into potholes - it 'feels' like if one hits a massive sharp hole, the shock should just shear them all off  lol If one *was* going to get spigot rings to help ensure centering / provide pointless peace of mind what materials would be best? I've seen plenty in plastic on eBay for 'only a cup of coffee' money (so not too much to waste, even if they are overpriced for the manufacturing cost) but have seen some offered in CNCd aluminium for £30, which is quite expensive... (and would there be issues with the weird different-metals-bonding thing when they are in contact with the wheels and the hub?) I know the correct answer is 'stop stressing and just fit them' lol but I thought I'd ask the question to satisfy my wondering mind! |
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Post by Zed. on Feb 19, 2022 18:05:01 GMT
modern plastics are good, the wheel is clamped to the hub by the studs & nuts / bolts so having the wheen concentric to start with is helping the mounting. just buy some and be done with it.... ps. my 2 ton t4 van has plastic spiggot rings and the roads around here are dreadfull  Rich. |
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so I'm thinking we may as well upgrade to 17", on the basis I've been wanting to do it for a while and the choice in 17" tyres is MUCH better.
) take some/most of the load or is it entirely on the wheel nuts?
lol
lol 
