I have a Giant Warp DS3 and id like to get a rear rack but am struggling to find anything decent & compatible. is there such a rack?
2001 Giant Warp DS3 from Bicycle Blue Book.
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You can get racks, what you get will largely depend on the load. The two styles that work are a seat post mount rack or once that clamps to the seat stay. Seatposts often have a low load limit, and can be prone to swinging around, but are generally very popular. Using on on a carbon frame would have to be done with caution - ensure a long seat post insertion. For heavier loads, a frame mounted rack such as the Thule Pack'n Pedal is best.
A post rack puts all the extra weight on the rear suspension, so has the advantage its suspended, but you might need to adjust shock settings for an ideal ride. A rear triangle mount is un-suspended weight, and will not affect shock settings as much.
This instructables posting explains how. You attach a regular rack to the Axle and to the rear diagonal stay
The intended use of full suspension bikes does not really overlap with carrying luggage around on a rear mounted rack.
You can't fit a on the rear triangle, and there are no mounting points, and the triangle is really not designed for it.
There are seat post mounted racks but as @mattnz says they are load limited as the are cantilevered off the seat post. Depending on what you are trying to carry, an oversize seat bag may work for you.