cast iron discs - ZX Forums
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post #1 of 5 (permalink) Old 04-19-2017, 04:09 PM Thread Starter
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Joined: Aug 2015
I Ride: Zxr750l

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cast iron discs

has anyone used them for a road bike? been offered two sets for mine and just wondering what like they are?
i know they rust in an instant but is this an issue?
i also know i need to use organic pads with them.
will they improve stopping power?

Last edited by Pyke13; 04-19-2017 at 04:17 PM.
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post #2 of 5 (permalink) Old 04-20-2017, 02:13 AM
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From: Near LGW, W.Sussex
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I had PFM iron discs on my old GPX 750R (ZX 750 F2), they created a drastic increase in braking. Rust is not an issue - no more so than you get with cars - I ran Kyoto organic pads with them & the discs lasted for years. You may find they are slightly noisier than standard discs.

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post #3 of 5 (permalink) Old 04-20-2017, 02:54 AM
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Cast iron, due to it's crystalline matrix of atoms, is the best material (outside carbon-carbon) for brake rotors, but it does tend to rust. Some of the modern stainless formulations are approaching cast iron in bite, and can be made thinner and lighter due to structural strength cast iron can't match.

It works great, but it's not the best choice for the street.

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post #4 of 5 (permalink) Old 04-20-2017, 01:00 PM
Joined: Jan 2016

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If they are used check them over good for hairline cracks,I've seen one blow apart but that was on a race bike.
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post #5 of 5 (permalink) Old 04-20-2017, 06:47 PM
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I run them all the time, but I am in a lower humity place. It really depends on where you live. If you get lots of rust on them it can build up in the pads and impact performance, create uneven wear, etc.

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