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#1549193 - 12/09/2015 15:49 330mm calipers and or radial mounts
H_R Offline
Club member 1114
My life on the forum

Registered: 30/07/2012
Posts: 1593
Loc: Dark side of the Moon
Hi been keeping my eyes open for some Alfa gta 330mm calipers, not essential and not in a rush luckily, as they don't appear too often!
but the question is are there Radial mounts comercially available that bolt onto the 20vt mounts that would take a variety of radial mounted type brembos and if so apart from the discs being different would they just bolt on and sit in the correct place for new discs?
Would radial mounts open up a wider variety of suitable alternative brembos?

Has anybody done a guide on what's needed and how to for 330mm big brakes? As I could not find any old post like that
Cheers

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#1610810 - 01/11/2017 14:53 Re: 330mm calipers and or radial mounts [Re: H_R]
Benharris24 Offline
Club member 1557
On a journey

Registered: 22/10/2016
Posts: 125
Loc: Southampton
Following

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#1610816 - 01/11/2017 16:17 Re: 330mm calipers and or radial mounts [Re: H_R]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Serious question - why do you want bigger calipers? Set up correctly, with decent discs and good pads (plus good fluid and good brake lines), the standard Coupe brakes are capable of stopping the car repeatedly from absurd speeds.

My setup is probably a bit more extreme than most, but I can get the front tyres to squeal from over 150mph without locking up. At my last trackday, one of my plastic wheel centres melted and fell out....

The real key is heat dissipation - the Coupe wheelarch is quite confined and lacks airflow - putting bigger calipers and discs in there isn't going to help matters
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#1610817 - 01/11/2017 16:40 Re: 330mm calipers and or radial mounts [Re: H_R]
H_R Offline
Club member 1114
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Registered: 30/07/2012
Posts: 1593
Loc: Dark side of the Moon
Forgot about that post 2 years has flown by!

I was only interested in the asthectics side of things as i was fitting 17" wheels

Actually i did get a set of the holy grail alfa Brembos, but couldn't be bothered with the hassle so sold them on

What im after now, due to you Nigel! is the Fiat 500 Abarth discs that you sourced that are a direct fit, again mainly for aesthetics!

hehe

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#1610843 - 02/11/2017 09:24 Re: 330mm calipers and or radial mounts [Re: H_R]
knight7660 Offline
Competition Level

Registered: 16/12/2007
Posts: 2231
Loc: Windsor/ Reading
Ive just got a set through and talking to a supplier on a cheaper deal at the moment but they are very expensive unless you find a set of used centres then buy after market outers and bobbings etc
_________________________
LE53 (452BHp & 389ftlb's with Quaife)
Wine red VIS FOOFY
Audi RS4 B7

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#1610859 - 02/11/2017 13:50 Re: 330mm calipers and or radial mounts [Re: Nigel]
Trappy Offline
Forum is my life

Registered: 27/02/2006
Posts: 5117
Loc: Essex
Originally Posted By Nigel


My setup is probably a bit more extreme than most, but I can get the front tyres to squeal from over 150mph without locking up.


Yeah, but your tyres are only fairly serious... loser
_________________________
FC Performance 420bhp, 328lbs/ft

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#1610871 - 02/11/2017 17:31 Re: 330mm calipers and or radial mounts [Re: Trappy]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Originally Posted By Trappy
Yeah, but your tyres are only fairly serious... loser


LOL - you're right - Toyos just don't cut it now - I need some AD08Rs
_________________________


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#1610876 - 02/11/2017 18:51 Re: 330mm calipers and or radial mounts [Re: knight7660]
andyps Offline
Club member 1482
Enjoying the ride

Registered: 16/12/2005
Posts: 1103
Loc: Pontefract, West Yorkshire
Originally Posted By knight7660
Ive just got a set through and talking to a supplier on a cheaper deal at the moment but they are very expensive unless you find a set of used centres then buy after market outers and bobbings etc


I'd be interested to know more about those when you know more - I'm trying to stick to OE wheels!
_________________________
Andy


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#1610919 - 03/11/2017 10:14 Re: 330mm calipers and or radial mounts [Re: H_R]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Brembo floating two-piece discs from the 595 Competizone and 695 Tributo Ferrari are currently available for £399 + VAT, plus about £20 P&P

Straight bolt-on for the 20VT

They make a noticeable difference
_________________________


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#1610923 - 03/11/2017 11:11 Re: 330mm calipers and or radial mounts [Re: H_R]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6750
Loc: Lightwater, Surrey, UK
So that's £502.80 inc P&P and VAT. I'm looking in Germany and have seen them for what I hope is £380 all in, which makes it pretty tempting...

What pads are you using Nigel? I know, I shouldn't be asking a "what brake pads" question, second only to "what oil"...
_________________________
2000 Pearl White Plus & 1996 Portofino 20vt
1985 & 2016 2017 Fiat 124 Spider + XF Sportbrake

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#1610946 - 03/11/2017 15:37 Re: 330mm calipers and or radial mounts [Re: H_R]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Oof! - £380 is a pretty good price

Still expensive compared to what I paid - I got them for £375 delivered, which included a set of Punto Abarth rear discs and Brembo front pads - by the time I'd sold these on, the front discs cost me a net £200 - should have bought more....

Dave - I use Pagid Yellow


Originally Posted By Nigel
Straight bolt-on for the 20VT

Actually, I'll elaborate on that statement - the discs are only bolt-on if you have aftermarket front hubs, which are slightly smaller than OE

Check out this thread for details (all photos now dead, sorry)
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#1610953 - 03/11/2017 17:31 Re: 330mm calipers and or radial mounts [Re: H_R]
H_R Offline
Club member 1114
My life on the forum

Registered: 30/07/2012
Posts: 1593
Loc: Dark side of the Moon
Any info on what aftermarket hubs need to be purchased to fit and which part to measure to determine? is it the bore or the flange depth? im a bit confused now
Dont suppose you still have a copy of the technical drawings or a link

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#1610958 - 03/11/2017 20:11 Re: 330mm calipers and or radial mounts [Re: H_R]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
I managed to rescue all my Photobucket images, so I should have the images somewhere- I will see what I can find
_________________________


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#1610960 - 03/11/2017 20:45 Re: 330mm calipers and or radial mounts [Re: H_R]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6750
Loc: Lightwater, Surrey, UK
Thanks Nigel, I am confuzzled too. As far as I can tell the OE discs and floating discs have the same 59mm hub "centering" diameter and all other critical dimensions look fine?

Edit: Ah I see, it's the OD of the hub flange at > 127mm that's the problem?

Your linked thread still contains what look like the original file names (before Photof***it adds a load of random characters at the end) so for the whole thread these are the names:

Coupefloatingdiscs
DSCF0525
DSCF0529
DSCF0528
DSCF0523
hubs
DSCF0583
DSCF0584
DSCF0585
DSCF0586
DSCF0587
DSCF0600
DSCF0601
DSCF0626
DSCF0625
Solid disc
Floating disc


Edited by DaveG (03/11/2017 20:47)
Edit Reason: Hub flange problem, right?
_________________________
2000 Pearl White Plus & 1996 Portofino 20vt
1985 & 2016 2017 Fiat 124 Spider + XF Sportbrake

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#1610972 - 03/11/2017 23:09 Re: 330mm calipers and or radial mounts [Re: DaveG]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Originally Posted By DaveG
Ah I see, it's the OD of the hub flange at > 127mm that's the problem?


Yes - that was the main problem (other than the fact I originally used Punto floating discs with 4 x 100 and a 59mm center bore - the 500 discs have the correct 4 x 98 and a 58mm center bore)
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#1611268 - 08/11/2017 22:59 Re: 330mm calipers and or radial mounts [Re: H_R]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6750
Loc: Lightwater, Surrey, UK
So I am still confused. I took off a front brake disc tonight to look at the hub and steering knuckle behind. The OD of the hub flange looked to be 116mm measured from PCD 98mm plus 9mm to edge from centre of bolt hole, and this matches the OD shown for replacement hubs (sometimes 118mm). But this will easily fit inside the floating disc where the appropriate measurement is 127mm.

The only problem I could see would be if any part of the outer edge of the steering knuckle in which the hub sits would foul the back part of the floating disc? The closest point at which this could be a problem is near where the track rod end attaches, shown by the tape measure here click to enlarge click to enlarge and if the rear face of the disc is further back from the inner face that sits on the hub by more than around 32mm then I can see there might be a problem, but that assumes the "hole" for the hub is 118mm diameter whereas it is 127mm, so the rear face can sit further back than that. In fact the rear face of the floating disc is a maximum 10mm at 127mm diameter and 38mm at 193mm diameter.

In other words, I think it should indeed bolt straight on?
_________________________
2000 Pearl White Plus & 1996 Portofino 20vt
1985 & 2016 2017 Fiat 124 Spider + XF Sportbrake

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#1611273 - 09/11/2017 06:29 Re: 330mm calipers and or radial mounts [Re: H_R]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Dave - from memory, I reckon you have the smaller aftermarket hubs, so the floating discs will bolt on with no issues.

However, if you want to try, I have a spare pair of floating discs lying around - you’re welcome to borrow them for a trial fit (they can’t be used on the road though, as the discs themselves are knackered - I bought them for the centres)
_________________________


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#1611279 - 09/11/2017 08:19 Re: 330mm calipers and or radial mounts [Re: H_R]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6750
Loc: Lightwater, Surrey, UK
I'd better check the other side too, but AFAIK the hubs are the original ones. A trial fit would be great, thanks, using MyHermes looks to cost a tenner, I will send a PM later.
_________________________
2000 Pearl White Plus & 1996 Portofino 20vt
1985 & 2016 2017 Fiat 124 Spider + XF Sportbrake

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#1611328 - 10/11/2017 07:50 Re: 330mm calipers and or radial mounts [Re: H_R]
deannn_20VT Offline
My life on the forum

Registered: 12/08/2006
Posts: 1858
Loc: Poland
Guys, I got used discs from Punto, do you know where I can buy outer runners etc for them?
_________________________
Self-built forged 20VT lump running GT2871R turbo, EMU Stand Alone & pushing true 350bhp & 350lbft.

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