GTEPETE Posted April 30, 2020 Share Posted April 30, 2020 On my Manta I have Cossy/4x4 vented discs with Cosworth/Granada calipers, when I fit my Commodore shafts I plan to use Granada 4x4 vented 5 stud discs with the same caliper...think I need to enlarge the stud holes, but need to check... ps how much did you shorten the Commodore shafts by to fit the Manta axle.. 1 Quote Link to comment Share on other sites More sharing options...
manta356 Posted May 6, 2020 Share Posted May 6, 2020 I Havent Shortened Them.I Expect them to be Approx 7-8mm too long But I need to Trim about 1.5mm off the Shafts at the Bearing End as I can't Find any Bearings for Std Manta Axle to Commodore Shafts (72mm x 36.5 mm x 21mm) So I'll Machine 1.5mm off them and Can Get 72x35x27 Bearings and I Intend to Make a Spacer Plate of 6mm to fit to the Axle Each Side to make up the Difference.This Will Give me Something to Fabricate a Bracket to for to fit Astra Mk4 Calipers and it Also Widens the Axle which will help to Fill Out the Arches. If You Don't Want a Wider Axle like I'm Doing,You'd be Able to Cut the 6mm off the Shafts and Still Have Enough Spline Lenght in the Diff.Also 70x35x21mm Bearings are Readily Available,Which is the Right Depth for the Manta Axle 1 Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 7, 2020 Share Posted December 7, 2020 Interesting topic regarding rear disc conversions......any other ideas/recommendations? Quote Link to comment Share on other sites More sharing options...
rutts Posted December 8, 2020 Share Posted December 8, 2020 Rover 220d front vented discs fit straight on. Using cosworth Sierra vented calipers. And said brackets. Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 27, 2020 Share Posted December 27, 2020 On 29/04/2020 at 23:37, Jessopia74 said: What is the od of the flange? I usually just use the Brembo part finder to try and match up. https://www.bremboparts.com/europe/en/catalogue/size?producttype=Disc&diameter=330&th=28 BMW would be a good starting point I guess for the 5x120, quick look E36 316 compact Very good link, I am also looking a vented rear disc with a small offset to fit my 5 stud Commodore shafts.... 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 27, 2020 Share Posted December 27, 2020 39 minutes ago, GTEPETE said: Very good link, I am also looking a vented rear disc with a small offset to fit my 5 stud Commodore shafts.... Do you know what calipers you will be using yet? Mk4 Astra? Obviously you are limited to 120mm pcd, so maybe a smaller/earlier bmw front Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 27, 2020 Share Posted December 27, 2020 Still planning to use the Cosworth calipers I have on the car. 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 27, 2020 Share Posted December 27, 2020 2 hours ago, GTEPETE said: Still planning to use the Cosworth calipers I have on the car. So you want something similar diameter and width but deeper bell or same? Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 29, 2020 Share Posted December 29, 2020 These are the ones I need. Fitted to the rear of Cosworth Granadas... PCD will need modifying to 120..... 273mm x 20mm 5 Stud vented 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 29, 2020 Share Posted December 29, 2020 Vented rears necessary for your car? Heavy 2 pedal use? Don't think I will need vented, ever on rear axle lol. Quote Link to comment Share on other sites More sharing options...
611 Posted December 29, 2020 Share Posted December 29, 2020 Cossie calliper's and BMW 318i discs work quite nice as well. 2 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 29, 2020 Share Posted December 29, 2020 Good thing about bmw discs is already the right pcd too. Like that setup 👍 1 Quote Link to comment Share on other sites More sharing options...
611 Posted December 29, 2020 Share Posted December 29, 2020 4 hours ago, Jessopia74 said: Good thing about bmw discs is already the right pcd too. Like that setup 👍 Went for the simple option!! Discs straight on, standard handbrake cable hooks straight up to those callipers and they seem to stop ok (Need it now with the motor in!!) 🙂 2 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 29, 2020 Share Posted December 29, 2020 26 minutes ago, 611 said: Went for the simple option!! Discs straight on, standard handbrake cable hooks straight up to those callipers and they seem to stop ok (Need it now with the motor in!!) 🙂 Saves me looking through the catalogue for figments too 😁 I guess it will look quiet oem with original h/brake cable too. 1 Quote Link to comment Share on other sites More sharing options...
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