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Disk Brake Conversion for 12" wheels
https://ausmini.com/forums/viewtopic.php?f=5&t=21792		 Page 1 of 1
Author:  Dave Elliott [ Wed Aug 23, 2006 12:48 pm ]
Post subject:  Disk Brake Conversion for 12" wheels
Hi All,

Firstly, apologies for bringing this topic up again. I have read the previous posts that cover this subject; thanks to all those who have contributed. There is a host of information in the threads and I'm comfortable with the concepts.

The slight problem I have is that these threads mainly deal with fitting these items under a 10" wheel, which of course requires extra machining and obviously the use of spacers.

However, I'm looking for some more information from anyone that has fitted Honda Civic disks and callipers to drum-brake hubs/uprights so that 12" wheels fit without the use of spacers.

Ideally I would like to fit 12” wheels to a Mini with having to worry about fitting wheel arches. More importantly I would like to retain the Mini’s suspension geometry. If my calculations are correct, the 12’’ wheels being slightly wider that the original 10” should fill the arches nicely.

I have been checking the fitting using 231mm Honda disks and matching callipers with some 12” mags that I have. The parts were sourced from a ED Civic (or so I’ve been told) and it is a non ventilated setup (which I prefer)

I have two types of "Hotwire" wheel which seem to require a spacer of approx 16mm between the disk and the wheel. The third wheel I have is a slot mag (jelly bean) type, this wheel has a much smaller inside diameter and they would require a much larger spacer.

Please note that all three of these wheels have the same centre-line offset (which is very similar the original 10” steel wheels).

There is talk in the other threads that Performance Minilite type mags fit over the Honda 231 disks without the use of spacers. Can anyone confirm this?

Also the disks from earlier model Civics seems to be a bit smaller in diameter (215mm) and are fairly close to the Moke 8.4”, has anyone used these?

Thanks for the help,


Dave
Author:  dove grey 64 [ Wed Aug 23, 2006 5:21 pm ]
Post subject: 
save yourself the problems..... just buy some cooper s disc's and calipers....then get some 12 inch rover minilites or other ones that are 4- 4 1/2inch wide, then you wont have to have arches..... if your fitting 12x5 rims to non spaced drums they will foul the inside of the wheel arches. when i did that the wheels wher touching the dampers.
the increased track will give you better handling anyway
my 2c
Author:  Dave Elliott [ Wed Aug 23, 2006 5:51 pm ]
Post subject: 
Thanks for the reply.

OK, best explain things a bit better.

I’m looking at a Honda brake conversion for my Moke. Currently it’s running with 12" wheels with drum brakes (small built in spacer type (not larger LS type)). The tyres are just at the edge of the guard, so I don't want to go wider in the track. Probably because it’s a Moke there is no fouling on the guards, shockie or tie bar even with a modified rack (smaller turning circle).

I have 8.4 disks on a sedan and S disks on yet another, both obviously need flares (which I'm happy enough with), but I don't want to make the Moke any wider.

My post was just to check whether there were any 12" wheels that would fit over Honda disks without huge spacers. Posts in the brake conversion threads seem to imply this, but my initial testing indicates otherwise.
Author:  speedy [ Wed Aug 23, 2006 6:54 pm ]
Post subject: 
Mini Mad (note the space, he's the one at the bottom of the following thread) and I tested some Rover 12" steelies over this Honda discs. Didn't work, they were "just" rubbing. He was going to take some of the metal off the caliper, but then decided to get some bling wheels instead. :D

http://www.ausmini.com/forums/viewtopic ... ight=honda

I don't remember what kind of Honda discs he's got, but you may want to PM if he doesn't see this thread. 8)
Author:  drmini in aust [ Wed Aug 23, 2006 9:07 pm ]
Post subject: 
Mini Mad is running Honda Civic 9.1" discs, I made them up. When they were on his Clubby S the Superlite 12x5s fitted OK with or without a spacer. But they filled the flares nice with 25mm spacers. 8)

The Moke now has these discs, it is wearing Superlight 13x7s, not sure if spaced or not now. :wink:
Author:  Mini Mad [ Wed Aug 23, 2006 11:06 pm ]
Post subject: 
drmini in aust wrote:
Mini Mad is running Honda Civic 9.1" discs, I made them up. When they were on his Clubby S the Superlite 12x5s fitted OK with or without a spacer. But they filled the flares nice with 25mm spacers. 8)

The Moke now has these discs, it is wearing Superlight 13x7s, not sure if spaced or not now. :wink:


My 12" Superlites fit with or without spacer as above..i retained standard clubby S track with the spacer though.

Be aware that aparently some 12" superlites don't fit..Hanra tried them and his didn't fit over..so there may be different offsets.

I currently have a set of 13x7's over them non-spaced. sit nice on the moke 8)

Image
Author:  Dave Elliott [ Fri Aug 25, 2006 3:35 pm ]
Post subject: 
Thanks Mini Mad,

I'm visiting the wrecker again tomorrow and after another quick look I'll probably grab a set of 9.1" disks and callipers. I'm sure I can get them to fit with a bit of work.

At less than $100 for parts and access to a friends workshop (probably a couple of cartons of Crownies) it sure beats the price of a 8.4" or (worse) Cooper S setup.

Definitely worth giving it a go.

I'll post my findings in case anyone is interested.


Dave
Author:  Dave Elliott [ Tue Sep 12, 2006 10:32 am ]
Post subject: 
Hi All,

OK, I've done it.

I found 9.1" disks (non ventilated) and callipers at a Honda wreckers. They were off a '84 to '87 1.5L Civic (import). The local Civics of the same era have ventilated disks which I thought would be too heavy, but they share the same calliper design so they should fit as well.

Made up two adapter plates from 8mm mild steel. I can supply CAD drawing if required. Had them laser cut for $88.

A friend machined up the Mini drive flanges to accept the Honda disks. This was the tricky bit because it has to be accurate to centralise the disk.

I needed a 15mm spacer between the disk and the wheels to give me the necessary wheel clearance and the same wheel track as my Moke drum setup.

All in all a very simple mod and I would like to thank others on the forum that have pointed me in the right direction.


Cheers,

Dave
Author:  dove grey 64 [ Tue Sep 12, 2006 10:35 am ]
Post subject: 
good to hear dave, how much did it set you back at the wreckers? and do you have to get this engineered?
Author:  Dave Elliott [ Tue Sep 12, 2006 5:46 pm ]
Post subject: 
$100 for 2 disks, 2 calipers. Not very many solid disks though, mostly vented at the wrecker I was at.
Author:  Hanra [ Wed Sep 13, 2006 10:11 am ]
Post subject: 
Mini Mad wrote:
Be aware that aparently some 12" superlites don't fit..Hanra tried them and his didn't fit over..so there may be different offsets.


My problem was due to the inside diameter of the rim. Ive got Performance Superlites, the inside section of the rim where the disc would sit was the same as a 10in rim....... So even tho i have 12's, if i wanted to do the civic conversion id have to do it to suit 10's.........
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