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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 09-12-2019, 01:00 AM
Trnc3 Trnc3 is offline
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Maximum wheel bolt length

Hello!

I was wondering if anyone knows the maximum length of wheel bolts that can be used before you hit something on the other side (handbrake at the back etc).

The reason I'm asking is because I am installing spacers to my new wheels but can now only use smaller star pattern wheel bolts instead of the regular ones.
I could only find 45 mm bolts of that style available for buy online and I would be installing a 10 mm spacer. That would bring the bolt length to 35 mm if we leave out the spacer instead of the original 25-28 mm. Thats a minimum of 7 mm longer bolt.

The question is, would these bolts fit or will I run out of room?
Thanks.
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Old 09-13-2019, 04:55 AM
rdl rdl is online now
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I don't know the answer but can suggest a method for you to determine it.

Remove a wheel and thread a lug bolt into the mounting hub to the depth your proposed bolts would extend. Turn the hub by hand to see if it clears. Wind the lug in another few mm or fraction of an inch and repeat to see how much margin of clearance you'd have. Front and rear.
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Old 09-13-2019, 09:41 AM
Trnc3 Trnc3 is offline
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Thanks, probably the easiest way.
I already ordered the 45 mm bolts anyway. Can always angle grind them if needed, I guess.
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Old 09-13-2019, 11:26 AM
u.nanimous u.nanimous is offline
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Actually seeing might be better, but that requires removing the rotor which meams also removing the caliper.
In the front there is a ton of room but the rear has the e-brake in the way.
From what I remember when buying spacers and extended bolts for a couple of our cars...standard bolts at 28mm go about 3mm into the space which I never measured but I'd guess is about 25mm (roughly an inch), so the front should accommodate close to 50mm without a spacer. The rear is probably more like 35 max without a spacer.

Other things from memory for calculating bolt length, rotor hat and hub flange are about 8mm each. Actual measurements should be taken though as my memory may not be close enough for you safe mounting of the wheels. And your wheels may make a difference so you should put a bolt through one while off the car to measure its thickness..

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