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5th gen rear brake adapter - interest check


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A year ago I went down the path of de-linking my VFR brake system.   The front brakes were pretty straight forward using the VTR setup.   However, in the rear, it was a bit more involved.  I didn't want to use the OEM caliper and modify it.  So, I designed an adapter that mounts on the existing hanger to mount a standard Brembo P32 caliper.   If you are planning to de-link your VFR800, 5th gen, this is a good solution for the rear brake.   It gets rid of the large OEM caliper.   This adapter bolts on to the stock hanger and will mount a Brembo P32 caliper in the same OEM underslung position.  The advantage of this adapter over a complete hanger is that disassembly of the hub and spindle is not necessary.   Well, also, it is simpler and therefore lower cost. 

 

You will need to make sure to source the correct version of the caliper as there are a few available. You must get the version where the bleed nipple is on the side closest to the mounting ears, same side of the banjo bolt.   I got the version where the bleed nipple was farther from the mounting ears.   It completely crashes the spokes and the tire valve.   As you can see in the attached pictures, the bleed nipple and banjo bolt are on the side opposite the wheel when mounted.   The P34 version is slightly bigger (34mm vs 32mm) and the pads may be too big for the rotor.   Also, make sure you have enough brake line length reach the caliper.  Bleeding will be no more difficult than the stock one.  Although, it may be easier to flush/bleed it before mounting. 
 

Anyway, this is just an interest check to see if it is worth making another batch of five or more.   Cost will be around the same of $125 plus shipping.    

Edit.  added the following:

DISCLAIMER:
* For off-road use only.
* You modify your bike at your own risk.
* You are responsible to decide if these components are good enough for the use or abuse you will subject them to.
* In using these components, you agree that I am in no way responsible or liable for anything that happens to or because of them.
* If you don't think they are up to the job, or if you don't think you can accept responsibility for mounting and using them, please return the item and I will issue you a prompt refund.
* When mounting, use thread lock and/or safety wire all fasteners.

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brake adapter 1 small.jpg

brake adapter 2 small.jpg

Edited by eyrwbvfr
added disclaimer.
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Tirso is sending me a P34 caliper to design around to.  This version will clear both.  The P34 will have a 50mm wide pad opposed to the P32 40mm pad.  As noted by someone else, please consider sizing the master to match.   Of course, greater braking is afforded by the P34.

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7 hours ago, RVFR said:

Perfect example of the version to AVOID!  I had this version and the bleeder completely crashes the spokes.  Lucky for me my Hawk had the current correct version and I just swapped calipers.

 

As an update, the design now clears both P32 and the P34!

 

The first pic is the P34 (from Tirso) and 2nd pic is my black P32.

 

The 3D printed part was ver 1.5 and it just kisses the pads with a couple thou of clearance. For the current ver 2, I just pushed the face out by another .040" (1mm).  

 

 

20200820_211022.jpg

20200815_140350.jpg

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Nice progress! Curious if you were able to move the caliper inboard enough to get the whole pad inside the OD of the rotor to accomodate using a new rotor and not having to trim pads.

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24 minutes ago, Dangeruss said:

Nice progress! Curious if you were able to move the caliper inboard enough to get the whole pad inside the OD of the rotor to accomodate using a new rotor and not having to trim pads.

Thanks!    I'd like to get everyone's vote on this change.   I'm OK with it even though I already trimmed my pads.  They are close to being replaced anyway.  It's only a few clicks to make the change.  

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For the people interested in this adapter, please state which caliper you have or intend to get.   It's looking like a version for each is needed.   I made the change to move it inboard and it was more involved than first envisioned.  I have a few hours into the redesign now.

 

The P34 looks to be made for a different size diameter rotor, maybe.  Just eyeballing it.  But designing to the P34, then fitting the P32 doesn't work.   Then designing to the P32, the P34 is off.

 

There are enough small differences that two adapters are needed.  One for each caliper. 

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It appears that the dimensions of P32 vary with port arrangement. On the first page of this thread I posted the dimensioned schematics of P32 and P34 from OPP's website, they are an authorized Brembo distributor. I checked again after your previous post and noticed the links weren't showing the images as I posted them so I changed them to links to the actual files. I also looked at other calipers and it seems that the P32 with radial ports like yours (P32F) differ from the axial port ones (P32G) that look like Tirso's P34. The schematics I linked earlier show the axial port style to be identical except for piston diameter. The radial port ones like yours however, have a much narrower pad and the mounting holes 1mm further inboard than the other style. The axial ones also have a 2mm narrower swept area, which might negate pad trimming without moving the caliper inboard. The P34 only appear to be available with axial ports, at least from OPP. I would be happy to use a caliper of your choosing if this is becoming a royal pain in your rear.

 

P32F, with radial ports, like yours; https://www.oppracing.com/images/cmsuploads/Brembo/OEM_Schematics/oppracing 20-5161-51_61 brembo.pdf

 

P32G, with axial ports; https://www.oppracing.com/images/cmsuploads/Brembo/OEM_Schematics/oppracing 20-6950-12_22 brembo.pdf

 

P34C, with axial ports like Tirso's; https://www.oppracing.com/images/cmsuploads/Brembo/OEM_Schematics/oppracing 20-6951-12_22 brembo.pdf

 

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Thanks for those drawings!   It confirms my findings with the 3D parts.  So, it still means two different adapters.   No difference to me since I machine them one at a time anyway.    I feel this is a good time to see if I can get deposits before making chips fly.  I will double check fittings since I do have both calipers.    Keep in mind, these calipers are designed for a different rotor and we (as in me) are fitting either caliper to fit a common rotor by best fit.  The caliper is over-sized for the rotor or another way is the rotor is undersized for the caliper.   For rear braking duties, I feel it is more than adequate.    

 

If you don't have a caliper already, the ideal caliper is the P34C or the P32G.  Both are dimensionally the same, using the same pads, more clearance and easier routing with axial ports with just different pistons.

 

Let's move forward with this as weekends are getting tied up with other projects and summer is nearing it's end.  

 

For now, the only person on the list I know of their caliper is:

 

1. @Dangeruss
2. @RVFR
3. @Tirso - P34c.

4. @Slo1

 

Now, if you want to send me a $50 deposit, send a friends payment to eyhonda@yahoo.com.

 

Eric

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9 minutes ago, Dangeruss said:

Deposit sent for P32G. Thanks!

Awesome!  Thanks!

 

1. @Dangeruss - P32g.  Dep rcvd.
2. @RVFR - 
3. @Tirso - P34c.

4. @Slo1 - 

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This makes two. Thanks Tirso!

 

1. @Dangeruss - P32g.  Dep rcvd.
2. @RVFR - 
3. @Tirso - P34c.  Dep rcvd.

4. @Slo1 - 

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The following Ducati Brembo rear caliper list from AMS Dallas Ducati may help in your search for a 32G or 34C caliper.

 

Axial Ports 32G
https://amsducati.com/brembo-p32-rear-brake-caliper
1997-98    Ducati    ST2
1999-02    Ducati    Supersport 750
2001-02    Ducati    Supersport 750 S
1999-02    Ducati    Supersport 900
2002    Ducati    Supersport 900 S

 

Axial Ports 34C
https://amsducati.com/brembo-p34-rear-brake-caliper
Year    Make    Model
2012-13    Ducati    1199 Panigale
2012-14    Ducati    1199 Panigale S
2012-13    Ducati    1199 Panigale S Tricolore
2014    Ducati    1199 Panigale Superleggera
2015    Ducati    1299 Panigale
2015    Ducati    1299 Panigale S
2003    Ducati    749
2004-06    Ducati    749 Dark
2004-06    Ducati    749 R
2003-06    Ducati    749 S
2008-10    Ducati    848
2011-13    Ducati    848 EVO
2012-13    Ducati    848 EVO Corse SE
2010    Ducati    848 Hayden
2014-15    Ducati    899 Panigale
2003-06    Ducati    999
2003-06    Ducati    999 R
2006    Ducati    999 R Xerox
2003-06    Ducati    999 S
2007    Ducati    999 S AMA Replica
2008-09    Ducati    Hypermotard 1100
2010-12    Ducati    Hypermotard 1100 EVO
2010-12    Ducati    Hypermotard 1100 EVO SP
2008-09    Ducati    Hypermotard 1100 S
2010-12    Ducati    Hypermotard 796
2009-10    Ducati    Monster 1100
2010    Ducati    Monster 1100 ABS
2012    Ducati    Monster 1100 EVO ABS
2009-10    Ducati    Monster 1100 S
2010    Ducati    Monster 1100 S ABS
2011-12    Ducati    Monster 796
2011-12    Ducati    Monster 796 ABS
2010-12    Ducati    Multistrada 1200
2015    Ducati    Multistrada 1200
2010-14    Ducati    Multistrada 1200 ABS
2015-17    Ducati    Multistrada 1200 S
2010    Ducati    Multistrada 1200 S ABS
2013-14    Ducati    Multistrada 1200 S GT
2012-14    Ducati    Multistrada 1200 S Pikes Peak
2011-12    Ducati    Multistrada 1200 S Sport
2010-14    Ducati    Multistrada 1200 S Touring
2013-15    Ducati    Panigale R
1999-03    Ducati    ST2
2004-07    Ducati    ST3
2006-07    Ducati    ST3 S ABS
1999-03    Ducati    ST4
2001-05    Ducati    ST4 S
2003-05    Ducati    ST4 S ABS
2010-11    Ducati    Streetfighter
2012-15    Ducati    Streetfighter 848
2010-13    Ducati    Streetfighter S
2003-06    Ducati    Supersport 1000
2003-07    Ducati    Supersport 800

 

Avoid the following:

Radial Ports 32F
https://amsducati.com/brembo-32f-rear-brake-caliper
Year    Make    Model
1995-01    Ducati    748
2001-02    Ducati    748 E
1998-02    Ducati    748 R
2000-01    Ducati    748 RS
2000-02    Ducati    748 S
1998-99    Ducati    748 SPS
1994-97    Ducati    916
1997-98    Ducati    916 R
1994-98    Ducati    916 Senna
1994-96    Ducati    916 SP
1997-98    Ducati    916 SPS
1999-01    Ducati    996
1999    Ducati    996 R
2001    Ducati    996 R
1999    Ducati    996 S
2001    Ducati    996 S
1999-00    Ducati    996 SPS
2002-03    Ducati    998
2004    Ducati    998 Matrix
2002    Ducati    998 R
2002    Ducati    998 S Bayliss
2002    Ducati    998 S Bostrom
2004    Ducati    998 S FE
2003-04    Ducati    Monster 1000
1995-08    Ducati    Monster 400
2005    Ducati    Monster 400 Dark
1993-01    Ducati    Monster 600
1999    Ducati    Monster 600 City
1998-99    Ducati    Monster 600 Dark
1999    Ducati    Monster 600 Dark City
2002-06    Ducati    Monster 620
2005-06    Ducati    Monster 620 Dark
2005    Ducati    Monster 620 Dark Single Disc
2007-08    Ducati    Monster 695
1996-02    Ducati    Monster 750
1999    Ducati    Monster 750 City
1999    Ducati    Monster 750 Dark
1999    Ducati    Monster 750 Dark City
2003-04    Ducati    Monster 800
1993-02    Ducati    Monster 900
1999    Ducati    Monster 900 City
1998    Ducati    Monster 900 Cromo
1999    Ducati    Monster 900 Dark City
1998    Ducati    Monster 900 S
2001-02    Ducati    Monster S4
2002    Ducati    Monster S4 Fogarty
1993-97    Ducati    Supersport 400
1991-97    Ducati    Supersport 600
1991-97    Ducati    Supersport 750
1991-98    Ducati    Supersport 900
1998    Ducati    Supersport 900 FE

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will be be any weight loss by changing calipers and adding a bracket.  also i assume this will fit 6th gen

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I can weigh the new calipers and bracket if someone else can weigh the OEM caliper.   Remember, there are other items removed if de-linking the brakes (extra lines, hard lines, joints, etc).

 

Also, someone else will have to comment about 6 gen fitment.  I don't know.  Like I said before, I can simply send you a 3D printed part for you to check fitment.  But then you would need a caliper or at least borrow one.

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The weight savings will be huge, with the de-link and smaller caliper. 
 

6th Gen swingarm is 25mm longer. That’s the only difference between it and the 5th Gen swingarm. The bearing carrier, bracket, axle, etc, are the same. 

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Adapter with 4 bolts = 1.6 oz.

P34 caliper with pads = 10.9 oz.

Total = 12.5 oz.

 

I will have time this week to machine the first two parts for P34 calipers.  New stainless bolt kits ordered as well.  Stay tuned.

 

 

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Aloha, Eric

Can I still order this adapter for a 32G caliper?

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Aloha, Eric

Earlier in the conversation, Dangeruss had asked about relocating the mount points to avoid having to dremel the brake pads.

Did you ever come to a conclusion, one way or another?

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31 minutes ago, ggathagan said:

Aloha, Eric

Earlier in the conversation, Dangeruss had asked about relocating the mount points to avoid having to dremel the brake pads.

Did you ever come to a conclusion, one way or another?

Yes, the caliper has been moved inboard to avoid any trimming in the latest version.  The adapter fits both 34c and 32g.   I only Dremeled mine because I'm still running my first prototype with a 32f caliper.

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On 10/17/2020 at 4:26 PM, eyrwbvfr said:

Yes, the caliper has been moved inboard to avoid any trimming in the latest version.  The adapter fits both 34c and 32g.   I only Dremeled mine because I'm still running my first prototype with a 32f caliper.

Nice!

 

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