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Rear Rotor
http://ducatittandf1.com/viewtopic.php?f=10&t=11305		 Page 1 of 2
Author:  fmcd92 [ Wed Feb 03, 2016 5:40 pm ]
Post subject:  Rear Rotor
Others must know of some tasty options for fitment of an effective but diminutive rear rotor to a 5.5 Marvic equipped TT750 with Verlicchi alloy swingarm I hope? The Marvic is a 3-spoke type with the usual 80mm pilot and about 102mm x M8 (6x) bolt circle. Looks like I may need a rotor with at least 17mm or more offset but I can deal with offset variances of course. Hoping for something 245mm to 260 max. Don't terribly need a floater but do want a rear rotor I actually can use as needs be. This is a track bike.

Also hope to discover where I can find the rear master cyl. pivot actuator lever thingie hinged in the bottom of the original TT type pumps.


All the best and thank you for any leads,

Francis McDermott

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Author:  ducttf1 [ Thu Feb 04, 2016 5:35 pm ]
Post subject:  Re: Rear Rotor
Hi Fran, I usually make the rear master brake pivot because most of the NCR ones I've seen look like billet aluminum as opposed to the one you show. I think I have seen both on original bikes. Just a piece of aluminum (3/8 inch) cut to the shape you have, a 10mm bronze bushing for the pin and a 5mm by.80 allen head adjusting screw, 6mm hole for the link and you are gold! Does Carlo not have the rotor you are looking for? If not I may have one. Hope this helps. Lou

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Author:  fmcd92 [ Thu Feb 04, 2016 7:15 pm ]
Post subject:  Re: Rear Rotor
Lou!

Perfect. I can do that and it looks like fun. My eyesight isn't near what it was so these jobs are more of a strain these days but as you say, critical accuracy isn't much part of this particular bit.

I will check rear rotor offset by doing a mockup, 180 rear rubber as you know.

Big thanks my friend!

Fran
Author:  618F1 [ Thu Feb 04, 2016 10:15 pm ]
Post subject:  Re: Rear Rotor
I say buy one of the correct 260mm rear rotors from Carlo. You will have it installed a week from now! Then you can spend the time on the master cylinder thingie. MikeV

Not much help, really. MV
Author:  fmcd92 [ Sat Feb 06, 2016 11:28 am ]
Post subject:  Re: Rear Rotor
I need to fix my topic-reply notification, I appreciate all ideas but am sometimes slow to acknowledge them. 260 mm would be fine for the rear rotor.

fmcd
Author:  fmcd92 [ Sat Feb 06, 2016 2:01 pm ]
Post subject:  Re: Rear Rotor
If this thread still has legs can I ask for any suggestions for lighter-weight rear axle and disco freno posteriore assemblies to fit Verlicchi swingarms? Yes, we can make one-off Ti. axles but if you've ever gun-drilled 320mm of Titanium in your home workshop you can understand why alternatives appeal.

Cheers!
Author:  Eldert [ Sun Feb 07, 2016 11:23 am ]
Post subject:  Re: Rear Rotor
Hi Fran

are you looking for a hollow 17 mm axle and 320 mm long ?

Yamaha XT600 type 3TB has one at the rear . weight is about 420 grams

Eldert
Author:  fmcd92 [ Mon Feb 08, 2016 8:03 pm ]
Post subject:  Re: Rear Rotor
Eldert that sounds excellent, now I have to find one. These were only in Canada 1993 one year.

Thank you!

Francis

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Author:  618F1 [ Mon Feb 08, 2016 10:53 pm ]
Post subject:  Re: Rear Rotor
Is 320mm long enough? Only 12.8 inches. I think you need about 13.5 more or less. MIkeV
Author:  fmcd92 [ Tue Feb 09, 2016 1:26 pm ]
Post subject:  Re: Rear Rotor
Hey Mike,

Not certain about other fit requirements but the Pantah 650 solid axle protrudes 20+ mm or thereabouts depending on the washers stacked over those Verlicchi swingarms side plates. For me the XT 600 axle should work. Up here XT 600 is a snowmobile model so yet another challenge. I would like to reduce rearward overall weight and instead send it forwards by doing so. Modern track slicks have such grip that weight bias is important right along with all the other imperatives we wish we could keep in some meaningful perspective.

I read somewhere that one good track session is worth 10,000 internet posts on the subject.

Cheers!
fmcd
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