GMP
If your talking about the bolt pattern for the rotor, from my reviewing all the avail online catalogs, only a GG rotor will fit a GG front hub. From the catalogs I looked thru the GG front rotor ID is 108.5 mm and after looking thru the EBC catalog it is the only rotor with that ID.
MotoMaster makes a wave rotor for the GG as well as a bracket. But, so far I have not found any US distributer that carries the MotoMaster rotor for a GG.
The DRZ will not fit. Neither the rotor or the wheel. The DRZ wheel is for a 20mm axle and the GG takes a 25mm wheel.
It just seems like the easiest way to go would be to find a hub from another mnfg. that fits. Next would be to find an adapter to fit to the fork and to the caliper.
Tony
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