Callaway Quantum Driver Rear Weight (Back Weight)

This precision-fit compatible rear back weight is designed for the Callaway Quantum Max, Callaway Quantum Triple Diamond, and Callaway Quantum Triple Diamond Max drivers. It installs directly into the Advanced Perimeter Weighting (APW) rear pocket, beneath the back cover plate, on all three Quantum driver models.

If you're looking to increase spin, raise launch angle, or add stability, moving to a heavier rear back weight than stock is a common choice. To reduce launch and spin or lower ball flight, most players will need more weight in the front of the driver — which means lighter rear back weights are needed to maintain the correct overall head weight balance.

Players dialing in a custom fitting after a shaft or grip change, or correcting a swing weight that feels too light or too heavy, will benefit from our 1g increments available from 1g–15g for precise swing weight adjustment without compromise. Heavier rear weights increase swing weight to offset a shorter shaft or heavier grip. Lighter rear weights offset a lighter grip or longer shaft, bringing swing weight back to your standard.

No specialty tools are required — a standard T25 torque wrench, which comes included with most drivers, is all you need. To install, simply remove the back cover plate to expose the two pod-style weights in the APW rear pocket. The weights can then be removed by hand and your new precision-fit compatible weights slid into place. Reinstall the cover plate using your T25 torque wrench, which ensures secure fitment without overtightening.

This makes swapping Callaway Quantum driver weights a straightforward process for both experienced club builders and golfers doing their own swing weight tuning at home.

Each order quantity of 1 includes one (1) individual weight in your selected gram option. Multiple weights and color variations may appear in our listing photos to showcase the available options, demonstrate installation, or provide product context — but a single quantity at checkout means one weight will be shipped. If you need multiple weights, simply adjust your quantity at checkout or add each gram option individually to your cart.

Due to standard manufacturing tolerances, the exact weight of each component may vary slightly from the listed gram value. Our target tolerance is ±0.5 grams, and in practice our components frequently exceed that standard — meaning real-world variance is often even tighter than our published tolerance.

For context, golf club heads from major manufacturers typically carry a tolerance of ±1–2 grams, and golf grips and shafts often have similar or larger variances. Our ±0.5g target is held to a higher standard than most of the components already in your bag. For products that include a screw and/or washer, listed weights reflect the total weight of the component including the screw and/or washer that ship with the product as an "installed unit weight."

These minor variations do not significantly impact performance and are well within accepted industry standards. Please review these tolerances before purchasing. By placing an order you acknowledge these variations as a normal part of precision manufacturing. If you have any questions before ordering, feel free to contact us.