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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through January 15, 2009 » Brake Rotor Q.... « Previous Next »

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Ochoa0042
Posted on Saturday, January 03, 2009 - 11:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I was looking around at my bike's & others brake rotors.... why is buell's ZTL rotor so thick compared to jap-bikes?
Clearly it can be shaved of unnecessary weight from it to its benefit, or not because....?
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Boltrider
Posted on Sunday, January 04, 2009 - 04:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

It helps minimize brake fade.
I wouldn't shave any from it. It might overheat.
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Aptbldr
Posted on Sunday, January 04, 2009 - 07:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Thicker steel to span longer distances?
XB front brake's friction ring/disk has relatively long spans, distances, between its connections to wheel rim, compared to conventional disk rotors mounted to wheel hub.

Rear 'conventional' disk is nicely thin.
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Smoke
Posted on Sunday, January 04, 2009 - 07:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

the race disc is thicker still.
tim
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Schmitty
Posted on Sunday, January 04, 2009 - 09:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The disc has to be made thicker to compensate for the extra heat generated by the single huge caliper. If the disc were made any thinner it would warp during the first hard stop. It needs the extra surface area to dissipate that heat. And yes the 1125R stock disc, which is the same as the race kit disc, is a 6mm disc versus a 5mm disc.

Schmitty
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New12r
Posted on Sunday, January 04, 2009 - 10:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Once you remove more from the rotor it will be prone to over heating. The overheating will cause warping, fade and an all around bad feel. read your manual, it has a min. thickness and if you fall below you are to replace it.

Every time you use the brake you will take a small amount of rotor with it. Over time the rotor will become too thin to be usable.

There has to be a certain amount of material to effectively dissipate the heat generated from the friction.

I am curious as to why you would want to make the lightest wheel/ brake assy of ANY bike on the road an ounce lighter? Yamaha has spent millions trying to save a few ounces of weight from the front wheel.

(Message edited by new12r on January 04, 2009)
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