What the thread found

• Increasing post diameter from 1.5 inches to 2 inches raises stiffness by a factor of approximately eleven times, following the fourth-power relationship between diameter and stiffness in tubular structures.
• Larger gimbal diameters can accommodate larger bearings, which typically provide smoother operation and better weight distribution with heavier camera rigs.
• A 2-inch gimbal provides greater leverage when holding the rig, making small hand movements have larger unintended effects on lighter rigs with low inertia.
• Smaller and lighter rigs benefit from smaller gimbal diameters to avoid excessive responsiveness to operator input, while heavier rigs with more spread-out weight benefit from larger diameters.
• Post diameter is only one factor affecting overall rig stiffness and rigidity; bearing quality, gimbal design, wall thickness, and material selection significantly influence performance.
• Hand size and personal preference play major roles in gimbal selection, with some operators preferring the control feel of larger gimbals despite smaller hand sizes after adaptation.
• Extended post lengths and whip pans stress the structural integrity more noticeably, where larger diameter posts show their stiffness advantages over smaller ones.

Depends on

• The original poster noted that physics-based calculations may not perfectly match real-world performance with different materials like carbon fiber, which requires empirical testing.
• Some participants noted that bearing quality and gimbal design quality can compensate for post diameter differences.
• The discussion reflects experience with specific gimbal models and designs from a particular time period (2009) when some manufacturing approaches have since evolved.
• Ergonomic preferences and adaptation period vary significantly between individual operators and cannot be universally predicted.
• Participants disagreed about whether post diameter alone determines practical performance differences in real shooting conditions.

Parts

Gimbal Bearing

Same gear or parts

1. 2026Lubricating a Steadicam gimbal bearing after cleaning, and the Tri-Flow supply problemOperator practice
2. 2026The pan bearing in the gimbal: what a Kaydon bearing is, what fails, and what a change of supplier would and would not meanOperator practice
3. 2026Adjusting play in a Steadicam® Master Series gimbal yoke and balancing it for smooth 180-degree pan without tipping.DisputedFacebookSteadicam operators group
4. 2026Removing a PRO gimbal from a VZ grip for conversion to a Volt-modified gimbal.DisputedFacebookSteadicam operators group