it's not the seatpost part you're worried about, it's the drop out part that hold all the weight.
p-clip are good but not a proper solution, check out Old Man Mountain as well as other has suggested, the Tubus rack (whom also designed for bicycle that doesn't have such mount).
it's not the seatpost part you're worried about, it's the drop out part that hold all the weight.
p-clip are good but not a proper solution, check out Old Man Mountain as well as other has suggested, the Tubus rack (whom also designed for bicycle that doesn't have such mount).