How much spacer is safe on stock rear studs?
 

What's generally safe to run with the stock rear studs? I'm considering 10mm spacers but don't want to bother if I have to replace the studs.

It seems most of the 10mm kits come with studs, so I wouldn't do it.

What is the rule? isn't it "seven threads engaged in the lugs minimum"? Don't quote me on that but I remember hearing something like that, so if you can't get them that far on the stud they should be replaced.

I've heard only 3mm on factory studs with spacers.


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This.

Yup 3mm is fine but anything over that needs extended studs.



Size of Bolt or Stud Mininum Number of Turns

14x1.5mm 7.5
12x1.5mm 6.5
12x1.25mm 8
1/2"e; 8
9/16"e; 8

Found here http://adaptitusa.com/wheellugnuttorquing.aspx

That's what I figured, thanks guys! I'll wait until I'm doing something more drastic to replace the studs (like when putting in adjustable UCA's maybe).

I'm running 5mm spacers onto the rear without problems.

I wouldn't use any spacer that is not hubcentric or does not have a hubcentric ring.

You do realize that no one sells a 5mm hubcentric spacer, right? It's because the depth of the hub flange is more than 5mm so the spacer would need to have a different center bore or be thicker than the flange to be hubcentric on its own.

At 5mm the wheel (if it's hub centric) would still be centered by the actual hub.

That is why I would never use a spacer that is not hub centric. That means no 3mm no 5mm etc...

I especially would never use those 3mm stamped / cast spacers

Any spacer must be hub centric to the wheel as well.

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This^ replacing studs is an easy job. Don't do it at all if you're not gonna do it right :thumbsup:

That's simply not facts, sorry. I'd agree with not using cheap stamped spacers, but a thin spacer is plenty safe.

The flange on the hub is usually around 10-12mm on most cars, which means with a 5mm spacer the wheel is still centric on the hub itself. That's also the reason why you only see hub centric spacers in > 10mm thicknesses for most vehicles.

HUH? I've been using an aluminum slip-on 5mm spacer for my work equips on my mr2 for the last 7 years. All is fine and dandy and absolutely no vibration issues or whatever.

Stop spreading misinformation.