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The mkiv Supra Owners Club

Spigot rings


trinitom
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Dangerous piffle. Of course it's load bearing. Wheel bolts or studs are designed to work in tension, not shear. Show me any OE wheel fitment where the wheel counterbore is not a direct snug fit on the nose of the hub.

 

 

Who said anything about shear force Chris? It's friction that keeps the wheel in place. This discussion has been done to the death, the numbers don't lie. The spigot is for centering the wheel, the friction between the hub face and rear of the wheel keeps it in place. If the spigot was for load it would be a lot deeper than 5-10mm and it wouldn't be 5mm thick, it would be solid. It would take next to no force to shear off the spigot of the hub if there was no friction force at work.

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The friction forces stop the wheel rotating relative to the hub, all shock loads from potholes and bumps are not designed to be put in shear through the bolts or studs, but though the nose of the ub via the wheels counterbore. You say it's only 10 mm long and hollow. Let's say it has a wall thickness of 1/8 inch (it's probably a lot more). Shearing a 1/8 wall tube of say 60 mm diameter is extremely difficult, it would laugh at the suspension / wheel loadings. It really is wrong to use a deformable spigot ring, or none at all.

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Dangerous piffle. Of course it's load bearing. Wheel bolts or studs are designed to work in tension, not shear. Show me any OE wheel fitment where the wheel counterbore is not a direct snug fit on the nose of the hub.

 

Who said anything about shear force Chris? It's friction that keeps the wheel in place. This discussion has been done to the death, the numbers don't lie. The spigot is for centering the wheel, the friction between the hub face and rear of the wheel keeps it in place. If the spigot was for load it would be a lot deeper than 5-10mm and it wouldn't be 5mm thick, it would be solid. It would take next to no force to shear off the spigot of the hub if there was no friction force at work.

 

Oh no, here we go again :D

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I might have a set of 61 to 73 rings in my parts storage, let me have a look. FWIW Ive had a car that had plastic rings fitted, they cracked and started to break up.

 

Arent they 60.1 on a mkiv ?

 

http://www.performancealloys.com list both plastic and aluminium spigot rings

 

£33 for aluminium so really there is no excuse not to have them.

Edited by Dnk (see edit history)
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