Next, I am going to test fit the Pistabassa T-Drive rotors and see how thick the spacer I will need to make it center with GP4-RR caliper.
First, I will replace the ProTi bolt KIT for the Panigale V4 front disk brake because those bolt at 20mm is way too short. The stock steel bolt that came with Panigale V4 from factory already 25mm... so I don't know why ProTi set a kit with 20mm bolt.
(Yes everyone, better not buy a kit from ProTi but just buy all the bolts ala carte after you measuring the stock bolt personally, this is not the only kit that I don't like from ProTi).
Plus now I will be using spacer, so for sure I want longer bolt, thus why I bought the 30mm ProTi bolt x 10 pieces... but of course I did not realize (at the time I bought this 30mm long bolts) that I will have to add spacer for the ABS/Wheel sensor... so only 5 pieces of this M8L30 bolt can be used (right side of the wheel),
but I will need to buy 5 more bolts M8L40 (40mm length) for the left side. I will show why further below.
First, I test fit without any spacer and want to see how center the rotor is compare to the brake pads in the GP4-RR caliper:
Collect the measurement:
Then I test fit the Melotti Racing ABS/Speed Sensor bracket:
Then I measure the gap between the sensor end to the phonic wheel (Air Gap), which is 11.16mm, so I know I would need at least 10mm spacer for the phonic wheel:
Next I add the 1.5mm Cerakoted Laser Marked in Brembo logo Spacer for the disk brake:
Next add 10mm aluminum spacer for the phonic wheel, since at the time of this test fit, I only have 2 10mm M8 aluminum spacer, so .... I only use 2 10mm aluminum spacers for test fit
That is why the bolt below looks odd, because only 2 bolts hold the phonic wheel:
Then install the 1.5mm disk brake spacer for the right side of the wheel:
Oh, here is how the ABS/Speed sensor look from the back side:
Time to test fit and see how close the airgap, and it is too close:
So I add 1.5mm (3 stacks of speed sensor spacer, Ducati original parts):
And now the air gap is within spec:
I then measured how to center the rotor to the brake pads of the GP4-RR, and it turned out they were still not centered enough, meaning the 1.5mm custom cerakoted laser marked with the Brembo logo spacer is USELESS !!!
But in the meantime, I did have some cheap 2mm spacer, which I test fit on the left side, and it's perfect for centering the disk brake rotor
So I need to order a NEW thicker at 2.1mm spacer, which I already did and should arrive early January 2024.
Also, turn out the stock T-Drive and the Pistabassa T-Drive has the same offset, which mean they are bolt on fit for regular Stylema or GP4-MS offset, but need 2.1mm spacer for 108mm style caliper such as the GP4-LM.
Yeah... so many custom parts is needed for this RVP25 Ohlins conversion, plus GP4-RR/LM conversion... but it's ok, I like to MODIFIED