Advice regarding BBS RS

[cyrmanj]

Hi all,

I got a set of Rennsport's 189, 4x100, 15x6, et38. Currently I am in the process of making them 7 wide, first pair of lips are on its way.

Currently I have a concern: front wheels touch the brake calipers of my E30, I need a 5 mm spacer. So I figure I could get H&R spacers. However, H&R spacers requires a flush mounting surface on the wheels. Wheels with a beveled mounting surface are not compatible with these spacers, and the RS have that beveled surface...

What's the right approach to this issue? Any other brand of spacers recommended for this application? Should I go for a custom made pair of hubcentric and wheel centric 5 mm spacers?

Thanks for the feedback/education!

[e30leigh]

how does the bevel create an issue? sounds weird to me. but custom hub and wheel centric are always the best option if the materials and workmanship/ finish are of the best quality

[cyrmanj]

how does the bevel create an issue?

Well to be honest with you I don't know, I am just taking into consideration H&R's recommendation. Which by the way its only for the 5mm spacers, the 8mm do not have that warning.

I guess I can buy the 8mm spacers and just take into consideration to also get 8mm longer bolts.

Any other ideas?

[kimmerkaze]

Here's what I found on Turner's site:

"Any spacer smaller than 10mm will not have a hubcentric lip on it. It's physically impossible since the spacer slides over the existing lip but is not thick enough to take the lip's place (the standard lip still protrudes through the spacer). With a 9mm lip, a 5mm spacer will only leave 4mm of stock lip left for the wheel to rest on. This is important to keep in mind when considering your wheel/spacer setup. A wheel witha beveled edge on the back will not adequately rest on the lip, resulting in a vibration because the wheel is not truly centered on the hub."

Basically, 5mm w/regular straight wheel bore will give you minimal hubcentricity to take wheel load but with a beveled wheel bore you're probably looking at no hubcentricity at all so you're relying on bolts to bear load and bolt taper / wheel hole mating to center/balance wheels.

Your call but depends really on how you'll be driving the car. You could always try to get some custom hub rings made up to fill up the bevel to spacer void.

[AE86]

I think your hub will still stick out far enough out despite the bevel and 5mm spacer. If I were you, I would just wait until the wheel comes and measure things out then. Does anyone know how many millimeter's the typical E30's hub sticks out?

[cyrmanj]

Thanks for the comments, I am understanding better now.

I'll measure how much the hub sticks out and also how much the wheels have a bevel surface before being straight, thus knowing how much the wheel will rest part of its weight on the hub.

I plan to use the wheels on my daily driver E30, ocassionally some amateur track days also so for me safety is important to keep in mind, even before looks.

[e30leigh]

i know you can buy alloy rings that fit into those bevels. ive run them on most my wheels as the hub lip diameter and centre bore was different. why not get a set of those? makes the wheel face flat again.

[cyrmanj]

^ Oh really? Do you have a link? Thx!

[kimmerkaze]

luckily mine's still on stands. quickly measured about 13.2 on front hub lip and about 14.5 on rears.

you can probably go safe with assumption and take 1/2" as overall depth you have to work with i guess?

not sure how deep the bevel is but you may only have a few mm leftover if you don't get those hub rings.


if you really want to know what size ring you need you could grab some putty (that cures somewhat hard) and put some on the spacer and squish it down when you install the wheel. then remove wheel, take putty and cut out a cross section of it and then bring to local machine shop!

[cyrmanj]

take putty and cut out a cross section of it and then bring to local machine shop!

I presume the material of choice for the rings should be aluminium?

Thx,

[PNWDan]

i know you can buy alloy rings that fit into those bevels. ive run them on most my wheels as the hub lip diameter and centre bore was different. why not get a set of those? makes the wheel face flat again.

That is only for wheels that have a inner dia larger than his RS. If his RS are the same, there is nothing you can do. Just check the depth of the bevel vs your hub.

[kimmerkaze]

I presume the material of choice for the rings should be aluminium?

Thx,

Yeah i don't see why not. You could also try getting a quote for some umhw or really hard poly. This may or may not help with shortening machining time so if mat'l and labour is cheaper then even better.

[PNWDan]

This isn't rocket science guys. If your hub is 13mm and your spacer is 5mm.... you have 8mm left over. If the bevel is less than 8mm deep, you will be okay. If it is more, there isn't much you can do. If the wheels already have a bore the same size as your hub, you cant very well make a ring to fill the gap.

Edit:

I will tell you that there are some places that make 10mm spacers that are hub centric with a 10mm deep bore. I have them and I just ground off a bit of the hub ends so they didnt bottom out.

[Todd Black 88]

The issue is there is not enough hub sticking through the spacer to properly center the wheel on the hub if the wheel has a bevel. I have been through this exact issue with 17" style 5's on my m3. You could end up with a vibration at speed like i did.

The answer is to get hub extenders or make some up like i did. Turner sells them for 72.4 mm bmw wheels, but i dont know about 57.1mm bore.

[PNWDan]

The issue is there is not enough hub sticking through the spacer to properly center the wheel on the hub if the wheel has a bevel. I have been through this exact issue with 17" style 5's on my m3. You could end up with a vibration at speed like i did.

The answer is to get hub extenders or make some up like i did. Turner sells them for 72.4 mm bmw wheels, but i dont know about 57.1mm bore.

This is exactly what I outlined but unless the hole in the wheel is larger than the hub on the E30, you cannot make or buy an extension