320 dreamer

i have 12mm lugbolts on my car. i emailed rad-usa to ask if they had 14mm cone seat lugbolts with 12mm shank . their response was that its ok to run 12mm lugbolts in a 14mm lugbolt hole.
can anyone confirm this? wouldnt it cause a wobble?

emoving

How is that possible! That sounds crazy!

320 dreamer

i just got another email from them. they say they do it all the time that the cone will seat the 12mm lugbolt. if this is correct i sold the kosei wheels i had for nothing!!
any sound advice would be appreciated
they go on to say most wheel companies drill the wheels for 14mm even though they are sold to folks with 12mm lugbolts

whipplem104

Cone seats are the same. The ball seats are different. I run a 12mm cone on a 14mm shank wheel. It seats all the way. The ball seats are a different shape though and they sell adapter lugs for that reason.

lowprofile

Sounds correct as long as we are talking about a cone seat.
In contrast, if we were talking about a radius seat(ball seat), a R12 is different than a R14 and you would need a special lug.

lowprofile

I owe you a beer whipplem104

rchase

I worked in the highest end wheel shop in my state growing up so if i understand your question let me give you an answer. Basically if the wheel had a cone seat then #1 priority is make sure you have cone. Factory MB, Audi, Porsche all have a ball seat and so a lot of the time companaies who made wheels say for a TT Porsche 911 they would come ball seated so the lugs factory lugs could be used.. Now it has been 6 years since i worked there but as I remember MB is 5 x 112, 12 x 1.5mm thread pitch and i cant remember the length... YOUR wheel had a 14mm hole...? As far as im concerened this should work. If you need me too I can call my buddies tomorrow and get you a for sure answer. Let me know.

320 dreamer

cone seat fitment only. my 32 has threaded 12mm holes in the hubs. wheels im thinking about buying have 14mm cone holes. e55 fitment. radusa says no problem run 12mm lugbolts (cone) in the 14mm holes as they will seat themselves. sounds reasonable but at speeds in excess of 120 mph i dont want to find out they were wrong!!

komp55

I work in a high-end tire shop in my garage. AMG uses a 14 x 1.5mm thread pitch with a ball seat. I would offer that if either the ball seat or cone fit the wheel correctly (i.e., sit correctly in the mounting bolt hole on the wheel, that's what applies the clamping force against the hub face when torqued to the correct specification. Assuming the center hole of the rim is hubcentric, then it would be okay to use a 12mm thread pitch under these circumstances. Lateral forces on the rim are secured primarily by the wheel bolts (which fit the wheel type correctly - cone or ball), and radial forces are controlled by the hubcentric fit of the rim (primarily), with a little additional help from the wheel bolts holding the rim in location on the hub. I would advise against using 12 bolts on a 14mm bolt hole wheel if you're also using an aftermarket hubcentric centering adapter. Those types of inserts, especially if made of hard plastic or aluminum tend fail over time creating vibration issues since the wheel is no longer centered correctly. The only really excellent hubcentric adapter system that I have confidence in is the BBS PFS system, which uses hardened metal center bore rings of precise fitment (which unfortunately can only be used on BBS rims).

320 dreamer

i was actually going to use a 20mm h&r hubcentric spacer on the rear to bring the offset back to a 35 et. this is a race only setup but want to be safe as can be considering the speeds

komp55

The larger H&R spacers are good and I didn't think to mention them. They have machined lips which allows the wheel to sit on the spacer as though it were sitting on the actual hub.

Staff@RPM

If you need any lugs, spacers or adapters please feel free to give me a call. I will get you set up with anything that you need, I may even have everything that you are looking for in stock.

-Craig

320 dreamer

if rad usa is correct i wont need anything. but to get ahead of the game is there a 14mm cone seat lugbolt that goes down to 12mm for the hub?