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JCW HELP. what BBK can fit r109's with no spacers?

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JCW HELP. what BBK can fit r109's with no spacers?

Old 02-14-2012, 08:02 AM
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HELP. what BBK can fit r109's with no spacers?

does anyone know what BBK can fit under my r109 JCW wheels?! from what i know even the brembo JCW BBK cant fit. still trying to find out if ap racing/wilwood etc. would? this is how my car sits now!

Old 02-14-2012, 09:11 AM
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The Wilwood's might. The diameter of the rotors aren't as big as the JCW kit (12.19" vs. 12.4"), so the rotor width/caliper might be a bit smaller as well.

Here is a link to the Wilwood caliper clearance diagram. This might help you out.

Old 02-14-2012, 11:37 PM
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The problem is the thickness of the caliper. At least for the JCW brakes. The JCW calipers kind of bulge out in the middle and that is where the contact is made. We are talking about a couple of mm. A 5mm spacer is all that is needed to make them work with the R105 rims. If the Wilwood or other BBK calipers are more flat than the JCW, you might not need a spacer. I use a 5mm spacer and though it was close, it was enough.

I'm not familiar with the R109 rims so don't know if this is the same with those.

Last edited by BMC_Kid; 02-17-2012 at 06:32 AM.
Old 02-17-2012, 05:55 AM
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The DP6 caliper kit on the 294 or 320mm rotor will give you the most clearance. Compared to the DPr caliper on the factory Wilwood kit, the DP6 is .290" or roughly 7.5mm narrower. I'd have to do some math on the hat/rotor offset to tell you exactly how much of a change that really is in service. From experience the DP6 is about the same "overhang" to the outer friction surface of the rotor as the stock slider- meaning if the current caliper clears the wheel; this will also.

Your one stop...for Wilwood brakes.

Old 01-29-2019, 06:19 PM
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Anyone now have good intel?

Bump from the Grave...

Anyone have any pics of these 109 wheels on their car with aftermarket BBK's??

Wondering if, with a reasonable spacer (max 8mm) that the 13" or even 14" Wilwoods will work with this wheel?

Heck...It's an 18" wheel!!


Last edited by mountainhorse; 01-29-2019 at 06:20 PM. Reason: Added pic
Old 01-30-2019, 05:19 AM
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A 13" DP6 kit should have no problem with that wheel. The narrowest of the kits on the market it takes up little room with regard to spoke clearance. Possibly a TCE 14" FNSL kit even.

You'll need to evaluate spoke to wheel pad clearance and compare that distance to templates and data supplied by kit manufactures.

In this case the distance of .6" or 15mm is the primary one you'll need to see if you have. Larger calipers such as the FNSL6 model or our FSL4 pot are wider and take up more space in that plane.

Check with a wheel off and measure from the pad to the back of the spokes.
Your one stop...for Wilwood brakes.

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