 5 Lug Conversion - Rear Rotors, Which Rear Rotor? |
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| 914sgofast2 |
 Jun 28 2025, 03:10 PM
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#1
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Senior Member  Group: Members Posts: 731 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None  |
I am collecting parts to do a five (5) lug conversion on my 1970 Porsche 914-4. I have a set of rear hubs which have had the five new studs installed, and I am wondering what rear rotors to use.
Can I just buy a pair of rear rotors for a 914-6 and use them with my existing rear brake calipers? Or do I need to get my existing 4 lug rear rotors drilled to fit over the five lug rear hubs? I am trying to avoid having to replace my existing rear calipers (from a 4 cylinder car) with a set of calipers from a 914-6. Thanks. I know a lot of people have done this conversion so they can run the Porsche 911 style Fuchs wheels, which is what I am planning on doing. My car is an early build, having been built in December 1969, if that makes any difference. |
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| Puebloswatcop |
Jun 28 2025, 03:17 PM
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#2
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Senior Member Group: Members Posts: 1,555 Joined: 27-December 14 From: Mineola, Texas Member No.: 18,258 Region Association: Southwest Region |
QUOTE(914sgofast2 @ Jun 28 2025, 04:10 PM)  I am collecting parts to do a five (5) lug conversion on my 1970 Porsche 914-4. I have a set of rear hubs which have had the five new studs installed, and I am wondering what rear rotors to use. Can I just buy a pair of rear rotors for a 914-6 and use them with my existing rear brake calipers? Or do I need to get my existing 4 lug rear rotors drilled to fit over the five lug rear hubs? I am trying to avoid having to replace my existing rear calipers (from a 4 cylinder car) with a set of calipers from a 914-6. Thanks. I know a lot of people have done this conversion so they can run the Porsche 911 style Fuchs wheels, which is what I am planning on doing. My car is an early build, having been built in December 1969, if that makes any difference. You can find a machine shop to convert the ones you have or if want new ones PMB sells them already drilled. |
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| Dave_Darling |
Jun 28 2025, 05:45 PM
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#3
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914 Idiot Group: Members Posts: 15,192 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Both options will work.
The Six rear rotors may rub a little on the caliper bridge as they seem to be very very slightly larger in diameter than the four ones. (Or were last I looked into this. Been quite a while.) Sometimes there's no rub, and often loosening the caliper mount bolts and pushing outward on the caliper body while tightening the bolts has worked for others. --DD |
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| nditiz1 |
Jun 28 2025, 06:03 PM
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#4
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Senior Member Group: Members Posts: 1,258 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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I purchased these from autohausaz
Sebro Coated Disc Brake Rotor; Rear P/N: S9-90135240118 2x$87.99 No rub on my calipers. |
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| 914sgofast2 |
Jun 30 2025, 01:44 PM
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#5
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Senior Member Group: Members Posts: 731 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
Thanks to everyone for responding with my options for doing the rear 5 lug conversion.
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