I wouldn't use ram mounts for heavy cameras. The are not meant to support full-sized canon XL type cameras especially if you're subjecting it to vibration like on a bike. But for mounting lighter electronics like cellphones, pdas, and palm sized video cameras on your bike, there is a suitable ram mount more than worthy for the job.
Nevertheless, being ambitious and lazy, I actually tried to mount a canon XL2 on a bike with the largest ball ram mount that was available 1.5" ball i think and while it seemed strong enough - I could not budge it with my hand - the moment I rode the bike I immediately noticed the ball slowly but surely slipping millimetre by millimetre. No matter how tightly I locked the knob the ball would keep slipping.
So I went with the superclamp. I mounted it to the top tube to support a manfrotto video head + XL2. But that was too ambitious. The slick tube was too slippery for the superclamp and luckily I found this out when I did a nudge test and not when I was riding on the road.
Eventually I just fabricated my own mount, a 1" thick steel bar L-bracket that rested on the top tube and U-bolts clamped it to the frame. And I must stress that the u-bolts did not support the weight of the camera + head at all. The load was entirely placed on the steel L-bracket balanced on the top tube. All the U-bolts did was held the bracket in place so it wouldn't slide off. That was the problem with my superclamp method, the load rested on/depended on the clamp, and clamps can be moved out of place, unlike the L-bracket which isn't going to move unless you crack the steel bar over the top tube. Sorry, with lack of pics, this probably doesn't make any sense
Look for welders in the yellowpages. You might be able to design your own custom bracket to do this sort of thing much better than anything you can buy off the shelf. One bracket idea I had but never fabricated looks like a bike fork and it straddles the top tube and the legs extend to the down tube where bolts lock it off, or it could even be bolted to the existing bottle holder threads though that would need more metal to reach that far. The upper anchorage might be the head tube or whereever. Anyways, with that kind of anchorage you can mount any kind of camera + head without worry. Having said that, I never actually made something like this let alone tested it, so I'm not responsible if anyone actually implements it and decapitates themselves along with 10 others waiting at a bus stop as a result.
Last edited by walmart; 11-23-07 at 07:07 AM.