Originally Posted by Avalanche325
The weight of your bike is hardly going to stress your wheels and fork. They are designed to handle lateral stresses with the additional weight of a rider, not to mention it all being multiplied by cornering at speed. I would much rather put a clamp on the rubber of my tire than on my frame.
Even with the cornering, the forces are still predominantly vertical to the wheel. Imagine holding the JUST, front wheel of your bike and pushing the bike laterally (roll axis). Although wheel is strong enough to withstand those repeated stresses, the aluminum fork dropouts of many carbon forks have been known to pull out of the carbon legs. Anyway YMMV. As for clamping the top tube, the holder arm doesn't "clamp" to the top tube, it just keeps the bike from moving side-to-side.