If you are talking about alloy bells and separate discs, the two that come to mind are Comp Brake and Rally Design.
The ones frechem has pictured look very nice (& expensive!). I can't work out if they are truly floating discs from the design - it's in the subtlety of the clamping bolts, but they appear to allow for expansion. If they are, these are well worth knowing about, as AFAIK, this is a first, not to be sniffed at. Bolting bells to discs is a mugs game compared to floating discs. Anyone warping G60 discs should eye this design up
Anyone care to elaborate on 1-piece vs 2-piece disks? My understanding is 2-piece are lighter and cool faster? Anything else?
Ignore the lightness - 0.22kgs is nothing. Choice of wheels is a far bigger issue! There is less steel in them to retain heat. + the point above about expansion. With heat, if they're not allowed to expand properly, they'll have a tendency to warp with heavy / track use. OEM cars are horrendous for this - 1 piece rubbish discs on a car with lovely Brembo OE calipers. Cue disc warpage on track.
is that true of the thick discs Chris? like the 330mm seat ones? I had 4 pots+304mm on the portly fiat and ds2500s and never had any warping issues
Well the Mk1 Focus RS set up didn't look much different to what was being put on various cars, including Pug 406 Coupes, and a day at Spa in a month-old car that wasn't being thraped soon had the brakes juddering up. Bill rapidly got through and past the OEM Cupra R Brembos. - there's a pattern, albeit track use. I've seen it elsewhere, set ups being jettisoned. Bit if a digression off the topic on my part - the floating(ish) G60 discs look mighty attractive, as they remove an inherent upper end performance issue with using OE discs.
Nope. Not sure how much modding the Fiat Coupe 304's need9they are 4x98 for a start), but it's possible, they are alot cheaper.
AP floating 280mm disc 25.4mm thick which would suit the Wilwood Dynalites I use HERE No bells listed though
The bells are just machined to suit the application. Universal bells available from Rally Design and I am sure other suppliers too. One thing to watch is there are many different disc mounting arrangements on the bells. ie number of bolts and pcd. I am sure Comp Brake do these 280 kits. I called them a while back about this as I was interested in reducing unsprung weight. They do a kit with 4 pots but the disc offset may be different from the oem 280 disc. Out of interested a Lotus Elise S2 uses 280 discs in 4 x 100, I noticed you can get alloy bells and floating discs for them. Think they were around 300 for the pair.
This may help, then again, it may be a route to matching the expense of the US items - works Rallye bells supposedly.. made by AP. Multi drillings suggest a universal item, but perhaps just for lightness? Interestingly the brake disc screw matches up on the hub! 178mm PCD, 12 mounting bolts ^^ AP part no: I'm pretty sure BG Developments in Birmingham make a lot of this stuff. If offset dimensions are needed from this bell, let me know which ones to measure. IMO the main thing is to get floating discs. Just bolting discs hard onto bells gives no scope for the disc to expand and just tortures them. Various set ups seen out there though, but anything high end always seems to be floating discs. The only thought on the issue of discs 'warping' is theorising I've read elsewhere about the pedal judder relating to pad material building up on the disc, ie the pad material being 'wrong'. It's a scienz which eludes me for now.
Also being covered in the Track Prep & Tech section: I've just spoken to compbrake and they are interested in producing a 280x22mm 2 piece disc as a straight replacement for the 1 piece G60. They need a disc new or old to measure up, I could post one up but it I expect the postage cost would be quite a bit, anyone close to Preston that has a G60 disc they could drop in?
