Smallest Spacer Size to Clear BBK in the Front?

[ldmiller78]

What CSL/ZCP rotor are you using with your 6 piston BBK caliper? On my kit, im using the E90x (360x30mm) which I believe has a thicker hat size than the E46 (345x28mm). I think im running the H&R 20mm Bolt-On Wheel Spacers on the front to clear my style 67 and 163. Im also lowered on KW3 with Turner motorsports fully adjustable camber hats.

[azmirm5]

Err, yes 8.5J

[Tbonem3]

8.5j

[azmirm5]

I have OE CSL fronts (8.5J) with buildjournal's Brembo 4 pot calipers and I have clearance using 10mm spacers

[AWE46M3]

AWE46M3 that's pretty crazy overboard if so, they're just following what the wheel balancer tells them to do so I'd bet the tires are junk.

Checked my wheels and the most my car has on one wheel is two weights, one 10g one 5g Most of them have a single 10g weight. Yours has like 30

You're probably right. I am planning on replacing the Firehawks with MSP4S in the Spring/Summer. I'll hope for a better result in terms of the weights when I get the new tires put on. Thanks for your input

[Thoglan]

AWE46M3 that's pretty crazy overboard if so, they're just following what the wheel balancer tells them to do so I'd bet the tires are junk.

Checked my wheels and the most my car has on one wheel is two weights, one 10g one 5g Most of them have a single 10g weight. Yours has like 30

[AWE46M3]

You hit any potholes? Might mean the wheel is bent. Or the tire is a bad batch and not round and requires a large offset in weights.

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I did not - but the wheels and tires are used so it’s possible. I’ll have them checked out the next time I get my wheels and tires serviced. No shaking or vibration when I drive. I just checked and all 4 corners are like this so I believe this was the tech going overboard with the weights vs an issue with my wheels/tires.

[mrgizmo04]

You hit any potholes? Might mean the wheel is bent. Or the tire is a bad batch and not round and requires a large offset in weights.

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[AWE46M3]

Hahaha don’t ask me, ask Americas Tires 😅 I’ll bug them about it the next time I take my car in.

[eacmen]

Am I crazy or are there heaps of wheel weights on your wheels lol

I was going to say the same thing.


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[Thoglan]

Quick update for this thread. I installed a 15MM spacer in the front and had ample clearance. According to the MM measure stick used to measure brake pad wear, I had 16mm of clearance. I could have run a 3MM spacer and been fine. I swapped out the 15MM with a 5MM spacer as they are readily available and I didn’t want to cut it too close. Overall the clearance is great. Thank you all for your input.

This applies only for OEM CSL wheels running a 6 piston kit in the front. The 6 piston calipers are thinner than 4 piston calipers so you likely need a larger spacer if you’re doing the 996 retrofit (12-15Mm per tbonem3)

Am I crazy or are there heaps of wheel weights on your wheels lol

[AWE46M3]

Quick update for this thread. I installed a 15MM spacer in the front and had ample clearance. According to the MM measure stick used to measure brake pad wear, I had 16mm of clearance. I could have run a 3MM spacer and been fine. I swapped out the 15MM with a 5MM spacer as they are readily available and I didn’t want to cut it too close. Overall the clearance is great. Thank you all for your input.

This applies only for OEM CSL wheels running a 6 piston kit in the front. The 6 piston calipers are thinner than 4 piston calipers so you likely need a larger spacer if you’re doing the 996 retrofit (12-15Mm per tbonem3)

[CarbonBlkM3]

Thanks for your input and the picture. Calipers look amazing behind the wheels 😍

Based on Ian’s feedback, it sounds like the 4 pistons are slightly thicker than the 6 piston calipers. Are your fronts 19x8 or 8.5? My fronts are slightly wider and my pistons may be a little thinner so I am going to bite the bullet and replace my front tires to OE spec (235’s) and run the 15MM spacer. I’ll report back with clearance pics and details once the install is done.

My pleasure. Fronts are 19x8, the true CSL fronts I believe are 8.5. I'm actually due for replacing rotors and pads. I wanted to try and go with Stoptech rotors for the fronts to try and save some money, but being I have the 380mm kit in the front I'm hearing the hats will not line up properly and have to stay strictly with Brembo rings. 😵

[AWE46M3]

That's correct, I believe I had to go with 18mm spacers in the fronts to clear my Brembo 4 pots with ZCP wheels. And it barely clears it.

Thanks for your input and the picture. Calipers look amazing behind the wheels 😍

Based on Ian’s feedback, it sounds like the 4 pistons are slightly thicker than the 6 piston calipers. Are your fronts 19x8 or 8.5? My fronts are slightly wider and my pistons may be a little thinner so I am going to bite the bullet and replace my front tires to OE spec (235’s) and run the 15MM spacer. I’ll report back with clearance pics and details once the install is done.

[CarbonBlkM3]

6 pots actually need less clearance than 4 pots.

That's correct, I believe I had to go with 18mm spacers in the fronts to clear my Brembo 4 pots with ZCP wheels. And it barely clears it.