RiceKidd

iTrader: (1)

Hi Guys,

I've been looking around the forums for the correct center bore measurements for my FC (88 GXL). Before anyone tries to be a smart *** and tell to use the search bar, yes, I already did. Which leads me to say I found 2 measurements people have mentioned, either 59.5 or 59.6...? Which one is true to size?

Ive already got the information I need for size on the RPF1, which is listed on their website. Just need to find the hub ring with the correct ID.

If anyone is currently running this setup and is running hub rings. Could you provide a link to the vendor you purchased from? Greatly appreciated!

Happy holidays!!!

StaticX27

iTrader: (2)

You could go measure the hub diameter pretty easily... That difference you're finding is probably aftermarket hubs vs OEM, or something stupid like that.

And more than likely, 0.1mm is not going to hurt if you're wrong. Most cheap calipers are off by about that anyways in practice.

WANKfactor

iTrader: (1)

I'm no engineer but i believe most OEM wheel centerbore are .1mm oversize to facilitate fitment and negate seizing so its possible both the rings you are looking at are the same size, difference being whether described as the female or the male measurement.

RiceKidd

iTrader: (1)

thanks guys!!!

thats what i though too with the over sizing of .1mm but just needed to know which one is oversized, the 59.5 or the 59.6. and you cant tell which one is the actual real measurement since people are saying 2 different ones not mentioning oversizing.

also, looking at HUB CENTRIC RINGS - SIZE SELECTOR | CentricRings.com you can select either 59.5 or 59.6 ID.

i just need someone who can really give me a definitive answer.

WANKfactor

iTrader: (1)

Got a decent pair of verniers?

Nosferatu

59.6mm iirc is FC centre bore...regardless that is a .1mm i.e. .004" difference.

90FC

I know this post is a bit old, but for future use and for those searching for this answer. The FC hubs measure 2.337" (depending on the factory machining tolerances, this may vary a couple thou). So either 59.5 (2.3425") or 59.6 (2.3465") will fit, though 59.5 will be a tighter (i.e. better) fit.

j9fd3s

iTrader: (3)

a slightly loose fit is ok. sometimes at the racetrack if someone changes a wheel that is hot, there isn't enough clearance, so the wheel nuts can tighten but the wheel isn't seated, so when you start diving the wheel falls off because it wasn't seated...

so assume the bigger hub size, and don't worry much about it

90FC

.005" isn't that tight of a fit. In your example the wheel in that area and hub are going to be roughly the same temperature due to thermal conductivity. They're both going to expand at a similar rate (in the rear, the wheel will grow more than the hub, aluminum vs iron) and whatever difference in temp there may be will not be enough to close that .005" gap.

To each their own.