Tuner Bolts keep coming loose

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The absolute worst “Tuner” bolts are the alloy rubbish often seen online, adonised with colour.
Popular with young car modders (Corsa, Nova,Fiesta, etc)
ive read horror stories of them stripping on insertion, snapping, and of a wheel suddenly overtaking the car 😱

Check are they actually high tensile steel bolts?
(so they don’t stretch) regular steel bolts may still strech.

Check you have the correct shoulders (taper/round) for the wheel.

Check the bolts are long enough (check how far original bolt poked out the back of original wheel - then check same with new bolts in new wheel - look for the same or tiny bit longer).

Check hub threads (prob fine, I expect the problem is the actual ‘tuner’ bolts.
 
The absolute worst “Tuner” bolts are the alloy rubbish often seen online, adonised with colour.
Popular with young car modders (Corsa, Nova,Fiesta, etc)
ive read horror stories of them stripping on insertion, snapping, and of a wheel suddenly overtaking the car 😱

Check are they actually high tensile steel bolts?
(so they don’t stretch) regular steel bolts may still strech.

Check you have the correct shoulders (taper/round) for the wheel.

Check the bolts are long enough (check how far original bolt poked out the back of original wheel - then check same with new bolts in new wheel - look for the same or tiny bit longer).

Check hub threads (prob fine, I expect the problem is the actual ‘tuner’ bolts.

Yep will do, just need some time and space to do this as I don't have much accessibility where I live. But as mentioned before, the wheels have been on the car for 2 years with tuner bolts and its the first time I've encountered an issue with them since getting them powdercoated. So I fitted new Tuner bolts from the same place I got the wheels from. I sanded the inner holes down a bit as well as the bolts taper sides. As the aftermarket wheels have small bolt holes only tuner bolts go in them. So far the new bolts are holding up to their torque spec. Just need to check them again after a short trip.
 
As long as the bottom shoulders in the wheel holes are tapered too, not rounded.

if rounded, you need bolts that match.
 
So went out for a spin today. Bolts have not moved and are still in spec. Few more runs needed just to be sure because its bladdy nerve wracking every drive. i.e. "What was that noise!"..."huh what was that"..... Seems like new bolts and sanding the bolt holes and bolts themselves done the trick. Probably just needed new bolts. Will keep you all updated.
 
Can you mark the bolts and wheels some way so you have a visual indicator if anything has moved??
 
Can you mark the bolts and wheels some way so you have a visual indicator if anything has moved??
I was thinking that before, where how the lorries have those highlighted triangles, but unfortunately the bolts are quite far in so hard to mark it, but ordred a fine tip sharpie to see if I can do it with that.
 
When you fitted the new bolts, was the mounting of the wheel to the hub disturbed?
 
When you fitted the new bolts, was the mounting of the wheel to the hub disturbed?

I fitted them few days ago, but I couldn't tell if the hubs were disturbed if I am honest.
 
Maybe a strip of masking tape in the hole itself too, temporarily to mark against? Once you're sure there's no movement over a set amount of time the tape can be removed.
 
I fitted them few days ago, but I couldn't tell if the hubs were disturbed if I am honest.
Did you replace each bolt one at a time or remove all five old ones then fit the new ones?
 

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