FAQ on tyre and rim data for FB/EKs

Includes handbrake, cylinders, shoes, discs, rims and rubber.

Moderators: reidy, Blacky

Payne62
Posts: 5
Joined: Fri Sep 12, 2014 12:04 pm
State: QLD
Location: Gold Coast

FAQ on tyre and rim data for FB/EKs

Post by Payne62 »

Hi Everyone,

When searching for information to assist me with changing my tyre/rim combination on my Ek I found it difficult to access the relevant information without a lot of time going through old posts and internet pages.

I have attached a PDF document containing all the Data , Dimensions and Tools I collected (and used) in case this is of use to others.

It would be great to have someone check for any errors and / or any worthy additions.

Cheers
Payne62
Attachments
FAQ Rim and Tyre Resizing for FB and EK Holdens.pdf
Information needed to size and select new wheels for FB/EK
(382.6 KiB) Downloaded 201 times
User avatar
Errol62
Posts: 9664
Joined: Sat Dec 06, 2014 2:44 pm
State: SA
Location: Adelaide

Re: FAQ on tyre and rim data for FB/EKs

Post by Errol62 »

Very well articulated. A good guide for the novice.
One point:
- Paragraph 6 says rim sizes should be same front and rear but your example has 6" front and 7" rear. I believe you mean that rims should be same diameter front and rear?
Thanks for posting.
Clay


Sent from my iPhone using Tapatalk
getting my FB ute on the road
EK van on rotisserie
Blacky
Posts: 12171
Joined: Tue Jul 20, 2004 8:58 am
State: WA
Location: up in the Perth hills

Re: FAQ on tyre and rim data for FB/EKs

Post by Blacky »

nice work :thumbsup: :thumbsup: will make this a sticky once its fine tuned 8)
When you're faced with an unpleasant task that you really don't want to do, sometimes you just have to dig deep down inside and somehow find the patience to wait for someone else to do it for you.


Foundation member #61 of FB/EK Holden club of W.A.
User avatar
Craig Allardyce
Posts: 1464
Joined: Sun Aug 07, 2011 7:26 pm
State: VIC
Location: Stratford

Re: FAQ on tyre and rim data for FB/EKs

Post by Craig Allardyce »

Great work mate but I would add some of the stuff in the post below regarding scrub radius relative to changing wheel offsets from standard. It seems to be always the last thing most people think of, and usually after they have gone to wider wheels because of the effect on tyre wear and heavy steering. Also offsets are really important especially with the extra loads that can be put on wheel bearings and stub axles.
http://www.fbekholden.com/forum/viewtop ... us#p206236
Payne62
Posts: 5
Joined: Fri Sep 12, 2014 12:04 pm
State: QLD
Location: Gold Coast

Re: FAQ on tyre and rim data for FB/EKs

Post by Payne62 »

Thanks for the feedback so far.

Clay, you are right the rim diameters need to be the same back and front. The width can vary as long as the difference in the rolling Diam of the wheel is within 1%. That's my understanding anyway. Can anyone else fact check that? I will modify that paragraph to make it clearer in the next version.

Thanks for the link Craig - I missed this thread. I'll see what I can add into the document and put it out for review.

cheers

Payne62
User avatar
Errol62
Posts: 9664
Joined: Sat Dec 06, 2014 2:44 pm
State: SA
Location: Adelaide

Re: FAQ on tyre and rim data for FB/EKs

Post by Errol62 »

Rationalizing my wheel collection and I have one HR rim, no hole, 90mm back space. It's going on the market so thought I'd measure this in case someone buys it.

FE to EH stockies measure the same, give or take.

I have four HR rims with hole, proposed to differentiate as disc brake fitment. Backspace is 85mm, once again give it take.

The non hole HR rim I'm losing came to me with the disc front that went in my old 62 sedan Errol the EK, and was the spare the 30 years I had the car on the road. I don't remember if I ever used It on the front discs.

My submission is that the hole signifies a P10mm offset, compared to standard P15mm.

Sent from my SM-G973F using Tapatalk

getting my FB ute on the road
EK van on rotisserie
Dr Terry
Posts: 207
Joined: Sat May 21, 2005 6:41 pm
State: NSW
Location: Eastwood

Re: FAQ on tyre and rim data for FB/EKs

Post by Dr Terry »

That 5mm difference between the hole & non-hole HR rims is spot on.

One of the oldest Holden myths was that the hole signified that they were "disc brake rims". Simply NOT TRUE.

AFAIK the HD/HR rims with the 90mm backspace (& no hole) were fitted to all HDs, plus HR commercials whether they had discs or not.

The rims with the hole were fitted the HR sedan & wagon only (again disc or drum) & increased the track dimension by 10mm, i.e. 5mm per side.

Dr Terry
User avatar
Errol62
Posts: 9664
Joined: Sat Dec 06, 2014 2:44 pm
State: SA
Location: Adelaide

Re: FAQ on tyre and rim data for FB/EKs

Post by Errol62 »

Thanks very much for clearing this up Terry. As you say it has been a matter of debate for some time, and a recent look at the MPC seems to concur. I didn’t think the 5mm offset difference would be an issue for clearance, and I recall one of the (very) subtle upgrades to the HR was widening the track.


FB ute fixer upper, EK van on rotisserie
getting my FB ute on the road
EK van on rotisserie
rosco
Posts: 2569
Joined: Wed Feb 04, 2004 8:34 pm
State: VIC
Location: Melbourne

Re: FAQ on tyre and rim data for FB/EKs

Post by rosco »

Dr Terry wrote: Tue Apr 07, 2020 7:11 pm That 5mm difference between the hole & non-hole HR rims is spot on.

One of the oldest Holden myths was that the hole signified that they were "disc brake rims". Simply NOT TRUE.

AFAIK the HD/HR rims with the 90mm backspace (& no hole) were fitted to all HDs, plus HR commercials whether they had discs or not.

The rims with the hole were fitted the HR sedan & wagon only (again disc or drum) & increased the track dimension by 10mm, i.e. 5mm per side.

Dr Terry
Thanks Dr T - I wonder if this had anything to do with the change in lower control arms fitted to HR's as well.. being slightly longer than those of HD ball joint front ends.... ?

frats,
Rosco
User avatar
Errol62
Posts: 9664
Joined: Sat Dec 06, 2014 2:44 pm
State: SA
Location: Adelaide

Re: FAQ on tyre and rim data for FB/EKs

Post by Errol62 »

Recent discussion here on HR rim differences FYI Harv. I will measure and post up here.


FB ute fixer upper, EK van on rotisserie
getting my FB ute on the road
EK van on rotisserie
User avatar
Harv
Posts: 5020
Joined: Mon Oct 08, 2007 2:00 pm
State: NSW
Location: Sydney, Australia

Re: FAQ on tyre and rim data for FB/EKs

Post by Harv »

Perfect :thumbsup: Hoping we can get a few photos and measurements of the different early Holden wheels posted up.

A diagram so that we are all talking the same thing:
Wheel measurements.jpg
Wheel measurements.jpg (260.72 KiB) Viewed 979 times

And some starting info:

FX-FJ Holden rims are 6½” bolt circle diameter
FE-HG and Torana rims are 4¼” bolt circle diameter
HQ-WB rims are 4¾” bolt circle diameter
Commodore rims are 120mm bolt circle diameter

FJ-HK wheel nuts have a 45º taper
HT-VF and Torana wheel nuts have a 60º taper

FJ-WB wheel studs are 7/16-20 UNF thread
VB-VZ Commodore wheel studs are 12x1.5 metric fine thread
VE-VF Commodore wheel studs are 14x1.5 metric fine thread

FX-FJ Holdens have 15” wheels
FE-HR have 13” wheels
HK-WB have 14” wheels
WB Statesmans had 15” wheels
Commodores had mixtures of 14, 15 and 16” wheels

Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
ardiesse
Posts: 1074
Joined: Thu Jan 19, 2017 9:57 am
State: NSW
Location: Sydney

Re: FAQ on tyre and rim data for FB/EKs

Post by ardiesse »

For the sake of completeness -

FX wheel nuts are 7/8" AF, 7/16" UNF thread, 45 degree taper.
FJ-HK wheel nuts are 3/4" AF, 7/16" UNF thread, 45 degree taper.
(I believe retrofitting FX wheel nuts to FJs was recommended to spread the load at the wheel nut seats on the rims.)

Rob
ardiesse
Posts: 1074
Joined: Thu Jan 19, 2017 9:57 am
State: NSW
Location: Sydney

Re: FAQ on tyre and rim data for FB/EKs

Post by ardiesse »

What about four-cylinder series 1 Commodores? They used 13" wheels carried over from the UC Torana.

Rob
User avatar
Errol62
Posts: 9664
Joined: Sat Dec 06, 2014 2:44 pm
State: SA
Location: Adelaide

Re: FAQ on tyre and rim data for FB/EKs

Post by Errol62 »

Apparently the Landrovers had or have same stud pattern as FX FJ.


FB ute fixer upper, EK van on rotisserie
getting my FB ute on the road
EK van on rotisserie
User avatar
Harv
Posts: 5020
Joined: Mon Oct 08, 2007 2:00 pm
State: NSW
Location: Sydney, Australia

Re: FAQ on tyre and rim data for FB/EKs

Post by Harv »

Errol62 wrote: Thu Jul 23, 2020 1:00 pm Apparently the Landrovers had or have same stud pattern as FX FJ.
1970-1974 and 1987-1993 Range Rover, and various 1987-2016 Discovery, Defender and Range Rover vehicles.

Just what a hot humpy needs.... a set of 26" mudrunners :lol:

Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
Post Reply