21mm H&R spacers

[splinterAMG]

Installed some H&R 21mm rear spacers on the '74 3.2 from our host.
Quality and fitment is first rate. TÜV approved ha.

Wheels are 911.361.020 42ET, tires 225/50/15 Toyo Proaxes RA1.
A bit less tucked with no poke from under TRE welded fenders.
No rubbing - drives nicely.










https://www.pelicanparts.com/More_Info/HR4295716.htm?pn=HR-4295716&gclid=EAIaIQobChMIzu-u-au59AIVpzytBh3TsgDvEAQYASABEgLLZPD_BwE

[Joe Bob]

To me, the definition of spacers is where they slip over the threaded lugs that are longer than stock. Your picture shows an adapter even though the lug pattern isn't changed. Many scrutineers have the same opinion.

One would would think "what's the diff"? Some racing bodies from full bore fender crunching down to AX don't allow them.

Just my $.02.

I have 1 inch adapters since I went to 6 and 7 inch wheels due the lack of 245/45/16 tires....but I don't do much competitive driving anymore so I could give a whoop.

[Sabai]

nice..been running the same spacers for a few years now without issues

If you get into racing and run into trouble..Porsche offers something similar:
Part number: 000-044-500-11

[87maniac]

why not go with 7" rears?
did that on an SC (with these same adaptors)
and it filled out the rear fenders nicely.

[Walt Fricke]

From time to time I read that some racing/track organizations don't allow this kind of spacer.

Given that Porsche used them on their air cooled turbos, I can't me see what might make them unsuitable. They might actually be stronger, as you don't have the bending moment you have with long studs and slip over spacers. Spacers, adapters, that's just semantics, and ought not to matter to anyone.

[berndtj]

Not sure, but it’s certainly harder to make sure everything is torqued. You can’t just check the “outer” lug nuts. I’ve had lug nuts come loose at a track day, so this could be a real problem.


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[ian c2]

I once came across a rule that spacres and track adapters must use steel open ended nuts .
But not that they could not be used .

[Walt Fricke]

PCA, and I suspect about all racing organizations, require open ended lug nuts. Typically steel, though PCA Club Racing also allows titanium (open ended). I guess this is to prevent guys using rims with thicker central parts, or spacers, which don't allow full thread diameter nut engagement. Closed ended nuts prevent visual inspection. The military carries (or carried) this to an extreme, requiring something like a quarter inch of stud protruding beyond the nut.

I have had occasion to question just how well thought out some DE type rules are. The tires on a car sent for a pre-tech often aren't the same as those used at the track. And then guys change tires mid event. Does some inspector have to check the torque on every change?

A properly torqued lug nut won't come loose, so the fear that the inner bolts on one of these 930 style spacers can't conveniently be checked for torque is the kind of "what if" that tends to pervade thinking. The outer nuts get removed relatively frequently as compared with the inner ones on this setup, so the chances of the inners not being torqued are very small. If lug nuts aren't torqued enough, the rim is loose, and you'd have to be pretty oblivious not to notice it once out on the track - it shakes like an overloaded washing machine, and you promptly pit. Maybe without all you lug nuts. This isn't anything like the Jesus nut or bolt on a helicopter rotor attachment. NASCAR allows the cars to run with only four nuts attached (used to be only three), so one loose nut out of five (or 10) isn't really a safety issue.

[ian c2]

This years rules make no mention of having to be open ended .
Was just a quick look through a quick Google search , so there may be more info .

[safe]

Originally Posted by berndtj

Not sure, but it’s certainly harder to make sure everything is torqued. You can’t just check the “outer” lug nuts. I’ve had lug nuts come loose at a track day, so this could be a real problem.


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Lube and torque them and they wont come loose. I have never ever had a wheel bolt/nut loosen or get stuck when lubed in any conditions on any car. There is plenty of bolts on a car that never gets checked for torque once they are put on.

I've used bolted spacers for years on the road and track without problem.

[safe]

Originally Posted by ian c2

This years rules make no mention of having to be open ended .
Was just a quick look through a quick Google search , so there may be more info .

17. "overly wide"

Sound like they would like choice to clamp down on anyone that shows up with 6 inches of spacers on a car, which might be less of a good idea.

I think I have something like 2 inches on my rear now... Unnecessary weight compared to a better suited offset wheel, but not any bigger issue than that.