Im very soon going out for a very long biketrip. I have a Marin Bear Valley 2006 years model, which have a cr-mo frame. The problem is that it lacks the eyelets on the back of the frame, to hold my Tubus Cargo! I have heard that the adaptors from Tubus to solve this, isn't strong enough for a long trip.
So, Im wondering if you might think it's a good idea to drill a whole through the rear fork, on the bars, on each side of the backwheel, and use a nut to connect the rear carrier. Do you think this is a good idea? Or will I loose too much strength of the frame when there is a hole in it? The hole should be 6mm.
On the right side I have some holes for mounting disc brakes. So Im also considering to weld on an extra bit of a steel-plate, with a hole in it, on the left side, and by that way connect the rear carrier.
So, what do you think I should do?