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MG MGF Technical - MGF Trophy brake discs

Hello folks,

Does anyone know what overall diameter of the MGF trophy front discs are? Are they 280mm or 320mm?
Robert Purser

305mm AFAIK
Dave Livingstone

confirmed.
:)
Dieter K.

(Robert is putting together a new big brake kit for Montys and Maestros, and is looking for a 280 mm disc that fits the hubs)
David S

HiSpec do a 285mm disk. Will that help?

P.
Paul Nothard

Mike Satur's Big Brake kit features the 280mm disks.
Erik

Mike Satur supplies Cobra Black Diamond discs - these are 280mm and fit an MGF / Metro hub.

Picture here (old disc):

>> http://www.sfforever.co.uk/viewgallerypicture.asp?id=11-18-240-241-242-243-244-245-246-249-247-248-250-251-252-253-254-255-256-257&queryon=22 <<

SF
Scarlet Fever

I thought that the tried and tested route for large discs on the Maestro/Montego hub was the 280mm VAG disc (as found fitted to various performance Golf's and Corrado's). They have the correct offset and thickness (44mm and 22mm respectively). You just need to re-drill the PCD to 95.25cm.

This, I believe (and I await to be corrected) is the background to Mike's 280mm conversion - as it was with the PAW conversion, HJW's short-lived version... is there a problem with availability of the PAW supplied kit?

PS, entering pedantic mode for a second, the AP racing discs fitted to Trophy and TF160 is 304mm in diameter...
Rob Bell

Rob,

Stop being pedantic, how do you want to re-drill a PCD of 95.25 CM ?? ;)

Peter
Peter

LOL Peter!

Three options regarding the discs:
1. Buy the discs without the holes pre-drilled into the bell. Then you have complete freedom to do what you want with the hole spacing.
2. Take an off the shelf disc, rotate it through 45 degrees and re-drill the stud holes (BUT you need to ensure that there is enough 'meat' on the discs bell to do this - want you don't want to do is seriously weaken the strength of the bell by doing this.
3. Elongate the existing wheel stud holes so that the disc will go over the 95.25cm MGF hub PCD.

Of all the options, it is option (1) that's clearly the most preferable.
Rob Bell

>>> LOL Peter! <<<
Yeah but did you really understand the funny part of it ?

95.25cm equals approx. 37.5 inches. which is a bit large to drill into a 280mm disk.

cheers,
Erik

You could stick extension winglets onto the rotor to do it Erik, and then fit tractor wheels to the hub ;o)

Of course, finding a Tractor wheel with a 95.25cm PCD might prove a little tricky as well ;o)


Don't ask me why I was writing cm instead of mm - 'coz I don't know either, d'oh!
Rob Bell

Sh1t!

That's why it didnt work!!!

Neil

back on topic - the Corrado discs are loose on the Monty hub and require a centre boss spacer to be machined up to ensure concentricity. Whereas the assumption is an F disc may be a better fit.
David S

Yuk!

I would go the Hi Spec route
sounds altogether far ...errr safer!!
Neil

Okay, I understand the problem now Dave.

Mike's 280mm Black Diamond rotor might be your best bet then Dave - might be worth dropping him a line.

HiSpec's discs would definitely be an option too.

Would the AP 304mm disc be too big for your purpose?
Rob Bell

Yes, we have similar constraints on the MM cars - 280 mm is the largest disc we can use with 15" wheels...
David S

What caliper were you and Robert considering using?
Rob Bell

Oh, just the standard ones New discs plus bigger diameter plus decent pad choice makes a big difference on Montys - or so I'm told. Ultra hard applications require 4-pots but then I'm also told good drivers learn not to use their brakes too much, even racers.
David S

Unfortunately, I'm not that good a driver David - but I'll keep practicing :o)
Rob Bell

This thread was discussed between 07/01/2004 and 09/01/2004

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