After performing a search on the forum I read that you used rubber expandable freeze plugs to fill the tire pressure sensor holes in some rims. Did you put the nut that expands the freeze plug on the outside of the rim therefore making them replaceable by simply removing the wheel from the car or did you put the nut on the inside thereby making them replaceable only if the tire is removed? Also I would assume that you put silicone sealer around the nut portion to prevent leaks or did you put it on the rubber portion of the plug as well? Thanks for the help. Joe C.

 

If it were me... I would put the nut on the inside so it can't blow out.

 

I had some aluminum plugs made and had them welded in from the inside. I am sure they won't come out. Total cost for 2 rims $70.

 

I've never seen one of these wheels , but presume that the hole is of a measurable diameter and thread pitch: If you don't wish to weld them in as Sab has done, any machine shop should be capable of turning these plugs and providing a gasket flange/O-ring groove - or simply install with red loctite. They will seal and never move again ....

 

What's wrong with welding? Now you have me worried...

 

Whoops - didn't mean to imply that there is anything suspect about welding - it's great; however, a threaded plug is a "sensor equivalent" alternative for those not into welding. eg. it would be easier in my case to lathe cut threaded plugs rather than welding unthreaded plugs - just a matter of choice - as are the rubber expanding plugs.

 

The holes are tapered and smooth so the expandable rubber plugs easily and inexpensively fill the holes. I have driven thousands of miles did some Driver Ed events ,mounted new tires and the three wheels six plugs have yet to leak . Plus since these are original Porsche wheels I can remove the plugs if someone really needs a correct GTS wheel or three with RDK holes. As I recall and this was years ago the larger metal washer is inside the rim and bigger than the hole. It is a rather crude "fix" , welding being a far more permanent solution as well as safer and nicer looking

 

.... thought I saw a pic of threaded sensors - but smooth tapered hole is good to know? ... so, how are they secured to the wheel? - a lock ring on the outside, which may explain the threads?

 

The "sensor" is two part like a nut and bolt with a thin rubber seal ring (easily damaged) . There is a special two part tool set to install and remove.

 

Got around to installing the freeze plugs on the rims today. For those of you looking into doing this I found that 1-1/8" freeze plugs were best as the 1" plugs were too small and 1-1/4" were too large. I installed them so that the larger washer rests on the tapered side of the hole. I installed lockwashers and torqued down the nuts. I chose to cut off the bolt as it stuck out quite a ways possibly leading to problems when mounting the tires. Finally I smeared silicone sealer around the nut and bolt portion. Total price for installing 8 of these plugs was around $25. I will let you know how the tires hold air when I have them installed. Thanks again for everyone's help. Joe

 

We have welded many a wheel with a cut plug and it works fine. Never a failure.

Best of luck..