I have no problem locking my rear brake on dirt and as far as the tar goes, who cares ? I do not want to go on tar anyhow.
For braking on dirt it is imperative that you use good offroad tires like TKC 80's or Michellin Desert's. Keep in mind that you only have about 25% braking in the rear and the rest upfront because when you brake, all your momentum increase the wieght on the front wheel leaving the back wheel floating a bit but giving lots of grip on the front.
Keep in mind though that a locked up front wheel will have your head make contact with the gravel faster than you can say Sahara, but your rear, even though it might be locked up will still keep your bike upright and manageble.
PS. Desert's will only fit your GS if you change the offset of the rim and replace the rear mudguard with a wider Accerbis Baja.
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