axel mount best off road
Attaching at the axel provides unsprung weight to the bike. Any attachment to the bike subframe or frame will be sprung weight. I would think a low unsprung weight would be more stable off road, not changing the weight bias of the suspension fore and aft.
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'08KX500AFC(my favorite) '07KLR650
'04KX500(street legal) '97CR500R
'06KLX250(351cc kit) '08KFX450R quad