K, so I built this a few days ago.
The bike I started with was good all round and had nothing evil about it. Now it'll get a death wobble going at maybe 20-25 km/h with no hands. Going faster is ok, and it's kinda hard to ride no hands slower. The rear of the red bike is slightly higher then it was before, I've clamped down the bb on the mtb rear triangle so hard the bearings must be ruined, so there's no slack there. Both wheels are reasonable true and the bearings are allright, only thing is the headset's a little loose. Front tire is mounted slight off since it was standing up when I inflated it, so there's a slight lump on the part that was on the ground. I'm just happy it happens at a low speed rather then say going downhill at 70km/h, but I'd rather get rid of this behaviour. Suggestions?