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How big is stock front rotor? (mm)

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I have a CRF front end/wheel on my XR and had a 19" wheel built for street use and need a rotor for it.

 Have stock wheel for dirt.

 I see 270mm "oversized" rotors for sale but my instinct tells me thats not much bigger than stock and that  I probably want 320mm.
 But then maybe I don't need 320mm unless I'm "racing" ??  

I"m not, but I want good stopping power.

Doesn't seem to be anything in between. 

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Stock size is 240mm, other sizes that I know of are 260,270,280,&320mm.

 

the 260MM that HM installing on their CRFs is more than enough for offroad rides. it's strong and give great brake power and feel without exposed too much to rocks

Edited by a c t i v e X

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