How Much Weight Does Carbon Fiber Actually Save? Real Numbers by Tube Size

"How much lighter is it, really?" Fair question. So instead of the usual "70% lighter!" hand-waving, here are numbers from our own scale, weighed this year, 1000mm lengths unless noted.

Measured Weights (1000mm, roll wrapped 3K)

Approximate, ±5% batch to batch. I weighed these on our shipping scale in March:

• 6mm OD × 4mm ID: ~28g carbon vs ~70g aluminum 6061
• 10mm OD × 8mm ID: ~55g carbon vs ~140g aluminum
• 16mm OD × 14mm ID: ~110g carbon vs ~270g aluminum
• 25mm OD × 23mm ID: ~180g carbon vs ~450g aluminum
• 40mm OD × 38mm ID: ~300g carbon vs ~750g aluminum

So yes, roughly 60% lighter than aluminum at equal dimensions, consistently, across sizes. Not 90%, not magic. Sixty percent, measured.

Where the Grams Actually Matter

On a 250g racing quad, swapping four 5-inch arms from aluminum to carbon can drop 30–40g. Over 10% of flying weight gone. You feel it in punch-outs immediately. On a 2-meter RC glider spar, the saving is a couple hundred grams right at the wing, which changes the whole balance.

Where it doesn't matter: short brackets, mounts under 50mm long. Save your money there and spend it where length multiplies the saving.

Weight Is Only Half the Story

Here is the mistake I see in every weight-obsessed build thread: chasing grams while ignoring stiffness. A thinner-wall tube saves weight but loses bending stiffness faster than it loses grams, because stiffness drops with the cube of wall thickness while weight drops roughly linearly. The sweet spot for most frames and booms is a mid-wall tube one diameter up from the smallest that fits -- you gain far more stiffness than the few extra grams cost you. Our 32-40mm tubes exist precisely for this reason: going up a size in thin wall beats staying small in thick wall, almost every time.

The Sizes That Sell for Weight Reasons

Our most reordered weight-driven sizes: the 5–10mm × 1000mm tubes for drone and RC linkages, the 21–30mm × 1000mm range for spars and camera booms, and 1–5.5mm solid rods for pushrods where every gram counts. If you tell me your all-up weight target I'll tell you honestly whether carbon gets you there. Sometimes the answer is that you need a design change, not a material change.