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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > wheel spacer thread length
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      11-14-2017, 04:59 PM   #1
Horley900
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So Ive ordered some spacers for my car, I've gone for the 12mm/15mm set up. I'm trying to buy some longer bolts to accommodate the spacers. The way I see it my original bolts are 27mm thread length. So I theory I should add on the spacer since to that 27mm. I.e 27mm+12mm would require a thread length of 39mm. For the life of me I can't find any M14x1.25 39mm bolts same for the rear no M14x1.25 42mm. Do they have to be exactly that length or can they be 1 or 2mm shorter?
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      11-14-2017, 05:55 PM   #2
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Originally Posted by Horley900 View Post
So Ive ordered some spacers for my car, I've gone for the 12mm/15mm set up. I'm trying to buy some longer bolts to accommodate the spacers. The way I see it my original bolts are 27mm thread length. So I theory I should add on the spacer since to that 27mm. I.e 27mm+12mm would require a thread length of 39mm. For the life of me I can't find any M14x1.25 39mm bolts same for the rear no M14x1.25 42mm. Do they have to be exactly that length or can they be 1 or 2mm shorter?
why not just get studs instead? I would be careful with running slightly longer bolts, as you can rub up against the brake disc. Too short, and you run into safety issues.
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      11-15-2017, 11:23 AM   #3
Horley900
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Quote:
Originally Posted by Horley900 View Post
So Ive ordered some spacers for my car, I've gone for the 12mm/15mm set up. I'm trying to buy some longer bolts to accommodate the spacers. The way I see it my original bolts are 27mm thread length. So I theory I should add on the spacer since to that 27mm. I.e 27mm+12mm would require a thread length of 39mm. For the life of me I can't find any M14x1.25 39mm bolts same for the rear no M14x1.25 42mm. Do they have to be exactly that length or can they be 1 or 2mm shorter?
why not just get studs instead? I would be careful with running slightly longer bolts, as you can rub up against the brake disc. Too short, and you run into safety issues.
To be hounst I've never heard so stuff being used untill now. I researched and I like the idea in principle but don't like the way the nuts sit out of the rim. I've now managed to source the front bolts from ebay and the reads from tuner shop in Germany.
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      11-15-2017, 11:26 AM   #4
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Originally Posted by Horley900 View Post
To be hounst I've never heard so stuff being used untill now. I researched and I like the idea in principle but don't like the way the nuts sit out of the rim. I've now managed to source the front bolts from ebay and the reads from tuner shop in Germany.
Stud conversion is the only way to go for BMWs and other European makes that incorporate bolts. There really isn't any downside to stud conversion, only positives. You can easily order the correct stud to keep the nut and stud inside the face of the wheel. To each, their own.
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      11-15-2017, 11:29 AM   #5
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Quote:
Originally Posted by Horley900 View Post
To be hounst I've never heard so stuff being used untill now. I researched and I like the idea in principle but don't like the way the nuts sit out of the rim. I've now managed to source the front bolts from ebay and the reads from tuner shop in Germany.
https://www.ecstuning.com/b-ecs-part...et/prf82ch5kt/

Buy whatever nuts you like (color/size) once you do the studs you can change it up easily.
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