Front Brake Disc - CBR600 FX

ajb · Crazy Courier Joined: 14 May 2008 Karma :

My front left disc got bent when my bike hit a car and I am looking to see if I can get a cheap honda second hand one off ebay.

I'm under the impression that any FX/FY disc will fit, does anyone know how I can tell if an earlier or later model disc will also fit/be suitable?

Thanks.
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CBR125R '05 > CB500 '00 > CBR600F '99

Bendy · Mrs Sensible Joined: 10 Jun 2002 Karma :

FX onwards is the same bike.

The earlier bike is completely different so chances are they wouldn't fit.

ajb · Crazy Courier Joined: 14 May 2008 Karma :

I've not found an FX one yet, and the newer ones look different.

Does anyone know if it's possible to straighten a disc? For example with some sort of engineering press?

Thanks.
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CBR125R '05 > CB500 '00 > CBR600F '99

kungfupoodle · Renault 5 Driver Joined: 04 Aug 2009 Karma :

Unlikely given the necessary tolerance.

I have just replaced one that was out by probably a tenth of a millimeter and it felt horrible

ajb · Crazy Courier Joined: 14 May 2008 Karma :

kungfupoodle · Renault 5 Driver Joined: 04 Aug 2009 Karma :

ajb · Crazy Courier Joined: 14 May 2008 Karma :

After a ride, the left disc is slightly warmer than the right. Immediately after it bent I had no front brake pressure but its a lot straighter now.

One thing I will check again is how the wheel spins with the left caliper removed, because I guess it's entirely possible it may still not spin as free as it should.
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CBR125R '05 > CB500 '00 > CBR600F '99

kungfupoodle · Renault 5 Driver Joined: 04 Aug 2009 Karma :

It sounds like you've got nothing to worry about.

Provided the disc isn't burning hot after only gentle braking then the slight increase in drag isn't going to cause any trouble.

If there are no (perceptible) symptoms of juddering or loss of braking power then leave it - a second hand item may actually make things worse!

arry · Super Spammer Joined: 03 Jan 2009 Karma :

kungfupoodle · Renault 5 Driver Joined: 04 Aug 2009 Karma :

OK - should have qualified it a abit more..

..assuming it was a gentle bend with no areas of high stress (e.g. creases). Sounds like it as any crease would have introduced a definite judder impossible to remove with a block of wood.

..and the braking force is radial, not in the direction of the damage

.. and come to think of it, I should probably have kept my mouth shut and stop applying logic before common sense. Sorry! Embarassed