are these disc to big?

fortune
fortune Posts: 62
edited July 2007 in MTB workshop & tech
hi, as some of you will probably know from reading the forums im thinking of buillding a custom giant stp, i quite like the look of the Hayes Disc Brakes HFX-9 HD but the only rotor size ive seen is 8" and i was wondering if they would be too big or would they be ok?

thanks

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