Can anyone confirm: front wheel hub depth '67 vs later

[techweenie]

I've read on this forum that the '65-67 wheel hubs are shallower by a few millimeters. Can they be put on later cars? I'm asking because I have a tire/fender interference problem on a '72 911 running 225/50 16s in front.

[Grady Clay]

7 mm. Yes, it will fit the spindle. Does not have the wheel centering provision.
You will probably want slightly longer wheel studs for Fuchs.
I don't know if there is a brake rotor/caliper offset issue.

Best,
Grady

[Fleming]

Grady is correct (again - don't ya love this guy).

The four hub depths are pictured here.

The first Number ending in .02 is from the non vented rotor - 1964-66. The second Rotor Hub (also ending in .02) is the one you want to work with, it's 7mm thinner than the 1969 and later vented rotor hub (#.03) . I think it is from the 1976 912 and maybe the 67-68 non vented - it had a somewhat wider track but still used the non vented rotor.

Caliper offset will have to be verified to get everything to line up.

The bearing surfaces are common for all of these calipers

The last hub .04 is the beefier later hub using the inny bearing cap.

(The other photo is just to verify the hub width that is being measured.)

Bob

[Grady Clay]

Great pictures and info.

I just went through my old paper parts manuals and found the following:

Early 911 through chassis number 305100 – 901.341.065.02 (my manual has some handwritten annotation that possibly we can decipher).

911 from chassis number 305101 through the end of the ’67 model year. There is no difference in hub for solid or vented (‘S’) rotors. Part number 901.341.065.03. I have one here we can measure if necessary.

911 everything starting with the ’68 model year through the end of the ’73 model year. This is the hub that is 7 mm wider than the previous ‘.03’ version. Part number 901.341.065.04. This was used on 911, 911T, 911E, 911S, 911ST, 912 (not ’76 type 923 912E), 914-6 and 914-6GT through the end of the ’73 model. I have some we can measure. (Not used on race versions with center lock.)

Starting with the ’74 model year, the wheel center feature was added. This required the change to the ‘inny’ wheel bearing cap. This 911.341.065.06 was common from ’74 to sometime much later. This was also used on the ’76 912E (923). At the same time the spindle threads were enlarged from M16x1.0 to M18x1.0 (also uses different adjusting pinch nut and washer). I have some we can measure.

With all of the above, there was not a difference between hubs for vented rotors and non-vented rotors. (An important issue with ’67-’68 vented brakes is a Factory spacer between the caliper and the support ‘ears’ in both front and rear, even though the hubs stay the same.)



Starting with the ’75 930 Turbo there were 930.341.065.00 and then changed to 930.341.611.00.

Best,
Grady

[techweenie]

Fantastic stuff, guys. I really appreciate it!

[Eric_Shea]

...excellent pics indeed.

This is very important as I get a lot of questions about "How can I run a vented rotor on my early 911? Is is as simple as bolting on a vented rotor and the proper caliper?"

The answer is; with a new hub. The critical measurement for the hub isn't actually shown so I took the liberty of doctoring the photo a bit.



An easy way of looking at this is:

#1 Solid Rotor
#2 20mm Rotor through 1983
#3 and #4 24mm Rotors on Carreras and up

Each time the rotor got wider, the calipers got a spacer and the hub moved a bit further outward to accommodate the thickness.

Fleming, thanks a million for the pics.

E.

[911st]

Dose this mean that an SC hub on a 3.2 Carrera will move the wheel in 7MM?

What would be involved in swapping them if so? Caliper spacer needed?

Is the 930 hub different besides the use of longer studs and a spacer?

Thx.

ps:
225's should fit in most cases with neg camber (monoball strut plate) and rolled fenders.

[jhelgesen]

this really has me wondering how I fit the 24mm carrera rotors and calipers on my 912e suspension.....I'll have to look tonight....

[djdsc]

Originally Posted by Grady Clay

(An important issue with ’67-’68 vented brakes is a Factory spacer between the caliper and the support ‘ears’ in both front and rear, even though the hubs stay the same.)

I was aware of the dog bone spacer for the rears but is there one for the fronts too? If so are they the same part?

Thanks

[Eric_Shea]

Dose this mean that an SC hub on a 3.2 Carrera will move the wheel in 7MM?

What would be involved in swapping them if so? Caliper spacer needed?

I would say so. The Carerra rotor was created to work on the same plane as the SC rotor. The caliper is the same with an 11mm spacer vs. the 7mm spacer on the SC version.

[Eric_Shea]

I was aware of the dog bone spacer for the rears but is there one for the fronts too? If so are they the same part?

I'm unaware of a front spacer.

Most definately not the same part as the rears on that car are spaced (mounting ears) at 2.25"

[Eric_Shea]

calipers on my 912e suspension

Not if it has M-Calipers with the 3" mounting ear spacing now.

You would need the later model struts with the 3.5" spacing for an A-Caliper. A Wide A-Caliper to be precise.

Not sure why you would want to add all of the weight of a Carrera rotor though... rotating mass is the last place you want to add weight. The 912E is a very cool unique classic. I wouldn't mess with it at all. Porterfields would be the best money spent. If you really want the pad area of the wide A-Caliper look at the Brembo upgrade in my sig. (sorry... not trying to pimp goods)

E.

[4sd911]

I have a '66 912 with solid rotors and with 185 tires I have paper thin clearance between the tire and strut. If I read this thread right a hub from a '68 or '69 car with solid rotors will move the wheel out 7mm?

[jhelgesen]

Okay, my 911 (which started life as a 912e) has a later model suspension on the front, with 3.5" spaced Boge struts, 47mm measurement on the hubs.



My question is, has anyone seen this before on their A arms? Looks like wear on the A arm, rubbing against the rotor.

[J2Hanson]

John, those marks on the arm don't look consistent with rotor rubbing. I would have expected to see a smoother surface mark, like a file. I recognize when the wheel is on and the suspension is loaded it probably real close, but it does look like something has hit it rather than rubbed it. Is the other side in the same condition?
John

[jhelgesen]

Probably grinder marks of some sort then, maybe from someone changing the ball joint? The opposite side looks fine.

[javadog]

I'm bringing this thread back to ask if anybody has pictures or measurements of the early turbo front hubs (the ones that used the separate spacer.) I'm curious if they were thicker in the area where the wheel studs are fitted.

Thanks,
Jeff

[Captain Ahab Jr]

bump

I would be interested in turbo hub info. too

[pksystems]

Sub'd.

[tdw28210]

OK, I have the somewhat mysterious Fuchs casted hub with the following part number. 901.341.605.2 R. There are several threads on the Early S Registry that all seem to end with the same question. What hub is this?

Note the the 605 is different than 065 cited in most hub part numbers. It is a non-vented 40mm hub.

Based on Fleming's post, it seems to be either a '67-68 solid hub OR a '76 914 hub.

Doing more research, this thread on the 914 forum seems to dispel that notion.

914World.com - The fastest growing online 914 community!

Anyone know anything more about their original application?