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Old 10-01-2017, 07:20   #1
leeslancer8
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Disc measures and Bell condition

Hi I have two sets of discs and whilst they look ok ish but im after the min thickness of the rotors and also what to look out for on the bell regards condition.

I'm led to believe that the bells should be good for a couple of rotor uses but how can you tell?

Im just trying to debate if to just buy complete new discs inc bells or just discs

Discs in question are

Evo X girodiscs
Alcon 343mm

Thanks
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Old 10-01-2017, 07:38   #2
Phil2333
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Make sure the bells have no hairline cracks between bolt and edge. .. Or any deformation in the alloy towards the edges.

The bells are not cheap! You can buy a new bolt kit tho.

Just run the discs till the little alcon ticks disappear.
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Old 10-01-2017, 13:56   #3
leeslancer8
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Will try to get some pictures of the condition to aid this thread. Could really do with min and max thickness measures for the discs
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Old 10-01-2017, 14:03   #4
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Are the bells standard Mitsi Evo X? I have a spare set if you need them.
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Old 10-01-2017, 16:13   #5
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Quote:
Originally Posted by plip1953 View Post
Are the bells standard Mitsi Evo X? I have a spare set if you need them.
No Phil they are girodisc centres and look ok ish from memory. But thanks anyway.

I'm more concerned with the Alcon bells as don't want to buy new rotors to find my bells need replacing which I think they will do. I'm having the calipers Refurbed so full new discs pads and hoses makes sense really.
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Old 10-01-2017, 19:07   #6
plip1953
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I thought rotors normally have a printed/engraved min thickness on the outer rotor edge.

I've never known of any need to changes bells, but should of course be discarded if there are any cracks or suchlike.

I would always check runout on any two-piece brake system. Ive never tried doing it just on the bell to check if that could be well out of true, but wouldn't be hard to do.
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