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> 5 lug rear rotors
jmargush
post Mar 25 2024, 04:18 PM
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Are the 5 lug rear rotors supposed to use the 2 small screws to mount them to the hub or does the wheel just hold them to the hub?


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mepstein
post Mar 25 2024, 05:22 PM
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The screws will hold it but not really a problem if the screws don’t line up or they are broken off in the hole. If the lug nuts/bolts are torqued, that’s all you really need.
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jmargush
post Mar 25 2024, 06:28 PM
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Funny
Both hubs and rotors are from PMB but the holes for the screws don't line up.
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sixnotfour
post Mar 25 2024, 06:31 PM
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Did you rotate the rotor on studs to confirm ???
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jmargush
post Mar 25 2024, 07:43 PM
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QUOTE(sixnotfour @ Mar 25 2024, 05:31 PM) *

Did you rotate the rotor on studs to confirm ???

Yes I went through all 5 positions
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mepstein
post Mar 25 2024, 08:18 PM
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QUOTE(jmargush @ Mar 25 2024, 08:28 PM) *

Funny
Both hubs and rotors are from PMB but the holes for the screws don't line up.

They are parts that work together but not designed together like if it was oem. If you need them to line up, you can always take it to a machine shop.
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rgalla9146
post Mar 25 2024, 09:03 PM
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I have some opposite info to offer.
Mark is right, countersunk slot screws do hold the rotor to the hub but ar not
really necessary when the wheel is torqued on.
Opposite ? There are two other threaded holes on the rotors (8x1.25) that are to
assist in removing rusted on rotors. Thread a bolt in them and it will push the rotor off
the hub.
Voila !
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mepstein
post Mar 25 2024, 09:12 PM
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QUOTE(rgalla9146 @ Mar 25 2024, 11:03 PM) *

I have some opposite info to offer.
Mark is right, countersunk slot screws do hold the rotor to the hub but ar not
really necessary when the wheel is torqued on.
Opposite ? There are two other threaded holes on the rotors (8x1.25) that are to
assist in removing rusted on rotors. Thread a bolt in them and it will push the rotor off
the hub.
Voila !

(IMG:style_emoticons/default/beerchug.gif)
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fixer34
post Mar 25 2024, 09:42 PM
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I believe it is easier to set the pad distance with the countersunk screw holding the rotor tight to the hub. The other option is to put spacers on a couple of the hub bolts and snug up a couple lug nuts.
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Steve
post Mar 26 2024, 07:58 AM
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Are they drilled hubs? Curious if those have an issue. I have always used 911 hubs, nothing drilled. Never had a problem with them lining up.
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76-914
post Mar 26 2024, 08:05 AM
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IIRC, Eric addressed that in one of his writings. I've read so many lately I can't remember which article says that if you use "X" then this will occur. (IMG:style_emoticons/default/confused24.gif)
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Olympic 914
post Mar 26 2024, 08:32 AM
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QUOTE(fixer34 @ Mar 25 2024, 11:42 PM) *

I believe it is easier to set the pad distance with the countersunk screw holding the rotor tight to the hub. The other option is to put spacers on a couple of the hub bolts and snug up a couple lug nuts.



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dr914@autoatlanta.com
post Mar 26 2024, 11:12 AM
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we use 914-6 rear rotors line up just fine
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jmargush
post Mar 26 2024, 12:42 PM
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Hubs and rotors are from Eric.
914-4 hub for 914 (not 914-6) and 5-lug machines rotor for 914-4 so I assumed they would line up.
At any rate I agree that the wheel holds the rotor on so I will just proceed that way
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willieg
post Mar 26 2024, 05:40 PM
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I had the same problem with the screw holes in the rotor not lining up with the tapped screw holes in the hub. I drilled and tapped the hubs, instead of just drilling new holes in the rotors. I figured I would need new rotors before new hubs.
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jmargush
post Mar 26 2024, 08:22 PM
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QUOTE(willieg @ Mar 26 2024, 04:40 PM) *

I had the same problem with the screw holes in the rotor not lining up with the tapped screw holes in the hub. I drilled and tapped the hubs, instead of just drilling new holes in the rotors. I figured I would need new rotors before new hubs.

Good to know someone else had the same problem
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technicalninja
post Mar 26 2024, 08:35 PM
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It may have something to do with re-purposing 914 parts to run 5 lug.

I got 914-6 rotors and the Euro 5 lug flanges for 914 stubs and the rotor retention screws lined up fine.
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Montreal914
post Mar 26 2024, 09:26 PM
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Added piece of information concerning rear rotors... (IMG:style_emoticons/default/smile.gif)

914/4:
Diameter: 282mm
Thickness: 9.4mm

914/6:
Diameter: 286mm
Thickness: 10.4mm
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JamesM
post Mar 26 2024, 09:57 PM
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When the 4 lug hubs/rotors are converted to 5 lug one of the existing 4 lug holes is used and 4 additional ones machined. If during the machining process the the same hole isnt retained in both the rotor and the hub then the rotor retaining screw hole wont be in the same orientation.

As stated its more of a convenience thing as once the wheel is installed the retaining screw just sits there and rusts so you should be fine to run it either way. May or may not be something that is on PMBs radar. You would need to ask them to determine if this was a mistake or just something they don't account for.

are you seeing the same issue with both rotors/hubs?

@Eric_Shea
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jmargush
post Mar 27 2024, 02:30 AM
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QUOTE(JamesM @ Mar 26 2024, 08:57 PM) *

When the 4 lug hubs/rotors are converted to 5 lug one of the existing 4 lug holes is used and 4 additional ones machined. If during the machining process the the same hole isnt retained in both the rotor and the hub then the rotor retaining screw hole wont be in the same orientation.

As stated its more of a convenience thing as once the wheel is installed the retaining screw just sits there and rusts so you should be fine to run it either way. May or may not be something that is on PMBs radar. You would need to ask them to determine if this was a mistake or just something they don't account for.

are you seeing the same issue with both rotors/hubs?

@Eric_Shea

Yes I saw it on both rotors/hubs.
Great explanation as to probably what happened.

I called PMB and they basicallyb said the same thing, that the bscrews aren't really needed.
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