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I did not see any Porsche part numbers on the inside, nothing that started with a 9XX. More than likely I will have to take a measurement on the ID of the cap cutout and lathe or CNC the ODs down to fit. It wont be till next year when I get back to work. I will post the results. Thank you Stan, Tony and Dave for replying to my post and helping with my issue.
Who knew that new center caps could be such a pain?!
If I might make a suggestion, perhaps since they are new they might require a bit more pressure to install the initial time or two. Give them a strong whack with the palm of your hand or a gentle tap with a rubber mallet, that might be all that is needed. Some lubricant might also be helpful.
So I used my calipers to measure the ID of the wheel center opening and found them to be 3.010" or 76.45 mm. then measured the center cap which measured to be 3.040" or 77.21 mm. Does anyone know the standard size of the Porsche center caps? My understanding is that they are the same except for the Macan, which I think are smaller.
So I used my calipers to measure the ID of the wheel center opening and found them to be 3.010" or 76.45 mm. then measured the center cap which measured to be 3.040" or 77.21 mm. Does anyone know the standard size of the Porsche center caps? My understanding is that they are the same except for the Macan, which I think are smaller.
That is such a tiny difference. One is intentionally slightly larger than the other, it’s what keeps it on the wheel. Search Rennlist and you will find others that have trouble because their caps spin and produce noise or they won’t stay on.
You could try the other three caps on that one wheel first to see what happens, but it would seem that you need to apply more force to press the cap(s) in to place.
Alternatively, take the whole lot to a tire shop and have one of their experienced techs pop the caps on for you.
Thanks guys, I tried to use a rubber mallet on it but was in fear of it breaking. I will check the other caps on the one in question but had the same problem with the other front also. Maybe they do need more force, just don't want to damage the new caps.
Thank you Joe, your wheel holes seem to measure similar to mine. Did you have to drive your caps in? Are your PN's for the caps the same as mine (993 361 303 00FFF)?
So I used my calipers to measure the ID of the wheel center opening and found them to be 3.010" or 76.45 mm. then measured the center cap which measured to be 3.040" or 77.21 mm. Does anyone know the standard size of the Porsche center caps? My understanding is that they are the same except for the Macan, which I think are smaller.
Geo,
I assume your center caps fit the rear wheels perfectly? My own experiences have been that the center caps of this style fit across many styles of OEM wheels such as the 996 C4S Twisties, the Carrera Lightweight wheels and the 17 incher Cup I wheels. I have a feeling that, in your situation, you front and rear wheels have different sized holes.
Steve
Just pulled the caps off my Cup Is and part numbers are below. Interestingly, the front are less concave and have JST stamped below part number. The rears have JOR stamped below part numbers and also have an additional tab. Rear center cap Front center cap
Of course I have no idea if the fronts are actually front and rears are actually rears or if they are just different caps purchased at different times by previous owners.
12-29-2019, 06:35 PM
