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      04-30-2017, 08:08 AM   #1
///ASN
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5mm spacer - safety concern

After having further reading about spacers, I have got a question for 5mm or 8mm spacers which doesn't have a lip.

OEM lip is around 12.5mm depth
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Using 5mm spacer will have 7mm lip left for the rim to rest on.
Most rims have a beveled edge on the mounting surface.
So, depending on how depth the beveled edge is, the OEM lip may only have very minimal contact surface to the rim.
Eg,
If rim beveled edge 4mm depth
The rim is only resting on 3mm lip (12mm - 5mm spacer - 4mm beveled edge) which is not safe and as lots of people said - vibrating ride, or worst case the wheel comes off the car during drive

Hub extender is only for the front wheel, so, what could be the solution for the rear wheel apart from going to 10mm or above spacers which have a hubcentric lip?
How much lip should the rims be rest on to be considered safe or adequate? 4-5mm?

For those who are using 5mm spacers, do you notice anything during drive or when mounting the rims on the hub (feel like the rims are not rest steadily on the OEM lip before putting the bolts)?

As someone said, "This is a safety precaution, you dont want to feel the ass end of your car drop and see your Vossen pass your ass on the highway at 80mph."
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      05-01-2017, 05:21 PM   #2
EB89
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I'll have to measure mine, I have 5mm at the front at the moment, BMS spacers.

Thinking of getting larger ones soon.
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      05-01-2017, 11:01 PM   #3
DR-JEKL
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Why bother with a 5mm slip on spacer?

I fitted a BBK to a previous car and the wheel spoke just snagged on the caliper and I had to run a small slip on spacer.

In summary if you're adding a 5mm spacer for aesthetics maybe dont bother if you need it for clearance you should be fine.
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      05-01-2017, 11:15 PM   #4
///ASN
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Quote:
Originally Posted by DR-JEKL View Post
Why bother with a 5mm slip on spacer?

I fitted a BBK to a previous car and the wheel spoke just snagged on the caliper and I had to run a small slip on spacer.

In summary if you're adding a 5mm spacer for aesthetics maybe dont bother if you need it for clearance you should be fine.
So, the reduced lip for the rim to be rested on doesn't really a matter in terms of safety?

I could still see extended bolts are needed for 5mm spacers though, agree?
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      05-02-2017, 08:10 AM   #5
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Quote:
Originally Posted by ///ASN View Post
So, the reduced lip for the rim to be rested on doesn't really a matter in terms of safety?

I could still see extended bolts are needed for 5mm spacers though, agree?
No 5mm wont cause your rim to fall off... Ideally some longer bolts would be nice but IMO just fit up a stud kit o that way you can just use regular studs and wheel nuts.
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      05-02-2017, 08:35 AM   #6
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Quote:
Originally Posted by ///ASN View Post
So, the reduced lip for the rim to be rested on doesn't really a matter in terms of safety?

I could still see extended bolts are needed for 5mm spacers though, agree?
After-market suppliers recommend that 5mm spacers are not used for the reason you have already suggested.

Additionally BMS and ECS also highlight that the spacer thickness increase should also be equivalent to the fastener length increase. Prudent Design Engineering advice.

Also no grease or anti-seize should be used on any mating face.
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      05-02-2017, 05:46 PM   #7
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Ideally you need turner motorsport hub extenders

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      05-02-2017, 06:04 PM   #8
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stud conversion?
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      05-02-2017, 07:23 PM   #9
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Quote:
Originally Posted by totti84 View Post
Ideally you need turner motorsport hub extenders

Hub extender is only suitable for front hub.
I will measure how deep the chamfered edge at the back of the rim and work out how much lip will the rim be sitting on.
If it will be sitting on 5-6mm, it should be ok, hopefully.
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      05-03-2017, 03:41 AM   #10
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Quote:
Originally Posted by Banana Clipper View Post
stud conversion?
A good solution.

Properly installed stud kit on the rear will allow you to choose the spacer thickness you desire.
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      05-03-2017, 11:42 PM   #11
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I have 5mm spacers on the front of my car from Advan with longer bolts. Works fine and adds a little bit of stance.

Still plenty of lip/hub for the wheel.
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