### WARNING ### Grimeca Disc Rotors

GRiSO Capo Posts : 273 Join date : 2014-04-23

Heard a rattle from the front end the other day while manoeuvring the bike over some bumps as I pushed it into my garage.
After grabbing & shaking anything I could get my hands on I located the source.
I found the left side disc rotor had a massive amount of wear on the bobins with way to much side and up and down movement.
These Grimeca rotors that several of us have fitted are Aprilia RSV parts and have only been on the bike for about 5000 km.
I immediately refitted the standard GRiSO parts as the level of wear was excessive an to my mind potentially dangerous.
Strangely the right side was ok only showing minimal wear and the brake performance was fine and there is no logical reason why it should have this much wear.
This may be just a one off defective part but I would suggest those that have fitted them, should check them to see if yours are ok.
I won't be fitting them again as the cost of replacing the defective item is not justified as I believe the performance gain from my perspective is marginal.
Excessive wear on carrier .
[You must be registered and logged in to see this image.]
Side deflection of rotor in relation to carrier in both directions.
[You must be registered and logged in to see this image.]

GRiSO Capo Posts : 160 Join date : 2014-10-14

I’ve seen some folks replace the bobbins with aerospace bolts converting to full floaters.
Work well but make a racket.

Have yet to do this mod to my GRiSO.

GRiSO Capo Posts : 9636 Join date : 2013-09-30

First oil, now rotors! I'll check mine....

GRiSO Capo Posts : 949 Join date : 2014-01-08 Age : 67

I'd better check mine too. I've got about 30,000km on mine.

GRiSO Capo Posts : 9636 Join date : 2013-09-30

I got about 10000 km on mine.

Guest

If only one disc has the problem, then I would suggest that it may be faulty.

I've got BrakeTech Axis Iron rotors on Bella, rattled from the day I bought them.
They are full floaters but have a different attachment design that doesn't impart any of the braking loads thru the bobbins.
Slightly heavier than Grimeca, and much costlier, about USD$700 a pair. AUD$1000 landed here 5 years ago.

[You must be registered and logged in to see this image.]

GRiSO Capo Posts : 273 Join date : 2014-04-23

Yeah, it is logical to assume that I had a dud one.
Unfortunately unless I can buy another one, I have spare unit which is of no use to me and based on the obvious quality questions and cost, I don't think I will bother.

The purpose of the post was to warn others, as I had not noticed the wear prior to hearing the rattle as the brakes were performing correctly.

GRiSO Capo Posts : 383 Join date : 2015-12-19 Age : 56

I recently purchased a pair of front rotors, but I actually bought 2xright side ones. The rotors have an arrow showing direction of travel.

I asked the bike shop to install them as they were putting new tyres on. They picked up that the discs were both right side and refused to install them.

Maybe your left rotor is actually a right side.

It could explain why they have different part numbers, when they look identical.

I haven't fitted mine at all and am trying to source a specific left hand side rotor, but haven't had any luck. Grimeca haven't replied to my emails, neither has the place I purchased the rotors from.

Anyone need a couple of right side Front rotors, going cheap!!

Fra Cristoforo Posts : 477 Join date : 2014-01-07

No, yours look the same because you do have two the same.
Mrgpz, look a bit better, the hole pattern in the disks is the other way around. So if mounted like they should, it looks good.
Grimeca sells these only to Piaggio. They won't answer you. And they were declared bankrupt after they made yours.

What partnumber do yours have? I might be interested

But anyway, This week a friend with a 2009 stelvio, had same problem with the floaters, but with OEM brembo disks. After 80.000km. massive play.

I know a lot of people using these disks, without this problem, also racing with them.

GRiSO Capo Posts : 9636 Join date : 2013-09-30

Mine are good. Left & Right discs, with no excessive play.

cheers

GRiSO Capo Posts : 1785 Join date : 2015-02-02 Age : 61

beetle wrote:: Mine are good. Left & Right discs, with no excessive play.

Same on Fat GRiSO, but I do get a grabbing when hard on the front brake, discs look straight ? Might do A run out check scratch

Don Abbondio Posts : 6031 Join date : 2014-03-13 Age : 68

Pad buildup Ron? This was a problem with the Sport/Breva/Norge disks early on, and resulted in many a disk being replaced under warranty due to being "warped". Turns out the bobbins were way too tight for a floating disk. In fact they didn't float at all. Cleaning the bobbins cured the problem.

GRiSO Capo Posts : 1785 Join date : 2015-02-02 Age : 61

Oz1200Guzzi wrote:: Pad buildup Ron? This was a problem with the Sport/Breva/Norge disks early on, and resulted in many a disk being replaced under warranty due to being "warped". Turns out the bobbins were way too tight for a floating disk. In fact they didn't float at all. Cleaning the bobbins cured the problem.

Could be Tony. I seem to have developed a more cautious approach to my bike maintenance for some reason Rolling Eyes

I’ll check it out soonish. One is struggling to wipe one’s bottom as yet tongue

GRiSO Capo Posts : 9636 Join date : 2013-09-30

Don Abbondio Posts : 6031 Join date : 2014-03-13 Age : 68

Bidet Ron?

GRiSO Capo Posts : 383 Join date : 2015-12-19 Age : 56

pauldaytona wrote:: What partnumber do yours have? I might be interested

2 of these 896011

[You must be registered and logged in to see this image.]

i think the left hand side is 896012

If someone wanted to swap a new 896012 for one of mine, i'd pay freight both ways

Glenn

Don Abbondio Posts : 2 Join date : 2016-09-28

Saw this on a Stelio in a dealer, bike had about 16k on it. Only the right side disc.

» Arashi Rotors
» Front Disc 'judder'
» Frontwheel disc distance 1100<> 1200
» Brake Rotors
» Oil warning below 2000rpm