333pg333

Can someone confirm if the latest 997 Cup runs 380mm rotors (36mm??) and what size wheels, 18" or 19".
Even better, would anyone know how much space you need to run this setup inside the wheel. ie Rotor = 380mm plus Caliper adds ?? to = e.g. 400mm or whatever??

Also, does anyone know if the latest calipers do run with 380mm rotors, can they be used with smaller versions?

Thanks.

Bill Verburg

I didn't look them all up but
2009 GT3Cup
steel
380x32 front and 350x28 rear

or
PCCB
380x34 front and 350x28 rear

wheels
9x18 ET43
11x18 ET30

2005 was the last year for the 355x33 & 330x28mm rotors, it's doubtful that the later calipers will clear the later hats.

JoeMag

They can be run under 18" wheel. Below is GT3R front brakes (380's) under GT3R centered 18" wheel. Would you like me to snag measurement from rotor to top of caliper?

mobonic

2010+ cups run 380mm front brakes and 18" BBS wheels.

BBS, CCW, Fikse wheels in 18" will all fit over the larger brakes, as well as all BBK kits.

I know from experience

333pg333

Thanks guys for all that.

Joe if you could possibly get that measurement and also the width of the caliper and how close the caliper comes to the inside of the spoke at the closest point.
If you could also get the hat measurement I'll buy you a lottery ticket.

Thanks again guys.

JoeMag

Here ya go Patrick...
- Caliper width ~170mm (I don't have caliper that goes beyond 6" to get accurate meas; you're getting paralax in the pic). As you can see these calipers take 1" pads.
- rotor to top of caliper is 20mm
- closest point on inside of wheel to caliper is right at the top of the spokes at ~18mm (bad angle in pic).

JoeMag

...oh yea. check out this thread for hat meas info.

btw, I'll take lottery ticket, just make sure it's a winning one.

https://rennlist.com/forums/showthre...ferrerid=30715

333pg333

Thanks a bunch Joe. Very much appreciated. Can I ask you only more request to just measure from the centre of the hub to the furthest point of the caliper. In other words, to get the an idea of the total space we'll have to fit inside my wheels in terms of Inside diameter. My wheel is 410mm inside so half of that being 205mm. Hopefully your center to very top of caliper is less than that?

JoeMag

Unforturnately i think you're a little undersized... Diameter looks to be ~206-207mm. Below pic was my measurment technique. I measured the ID of bbs 18" barrel and it's ~440mm.

333pg333

Hmm, something doesn't quite add up. I think I need to re calculate. Also I think the point that you're (very kindly) measuring to on the caliper is not the furthest point from the axle. ie Assuming where the end of the caliper that you're measuring is at say 1:00pm on a clockface, if you moved it around to about 2:30pm it would be even further out from the centerline, no? The caliper's tallest point when viewed from side on would be in it's middle, yes?

I can't imagine that the thickness of the BBS rims is so much thinner than the Fikse to make such a difference in internal ID, but maybe that's the case. I'll have to recheck my wheels.

Julian Allen

Patrick, I'm using a specific BBS center on my front wheels (0228039) vs the rear wheels (0228051). The fronts are "deeper" between the face against the hub and the outer ring (for the wheel halves to mount to) which gives clearance for these calipers. Only about a cm, but that's enough. You might see if Fikse has comparable centers. HTH.

JoeMag

Patrick -- what you mentioned is exactly what I thought, and was the first place I measured. However, see side view below...

333pg333

Thanks for that Julian. What size rotors are you using?
EDIT: Just re checking your thread on R/werks. Looks like you're running Cup Brembos with adaptors. What spindles are they Julian, Mo30?

I see what you mean Joe. Bit hard to tell quite where the caliper is furthest from the centre.

Julian Allen

380 mm rotors. The spindles are M030's.
FWIW, the BBS wheels have always allowed bigger brakes: 16" BBS's would clear big red/big black calipers (street wheels had to be 17's). I originally had some different front centers, but when I test fitted and they didn't work switched them to the 039 centers.

333pg333

Thanks Julian. The plot is getting thicker. I can get some nice BBS wheels but I didn't plan on spending more money on wheels and I can't afford to render the Fikses (that weren't free of charge) obsolete.
So going off Joe's measurements it would appear that I need a min internal diameter of about 420mm to run 380mm. Might have to go back to 355mm. Wonder if we can convert the 997 Cups to run on a smaller rotor...