The Callaway Big Bertha Alpha 815 driver uses the 8-combination OptiFit hosel: loft can move from -1° to +2° around the stated loft, with separate N (Neutral) and D (Draw/upright) lie choices. Its second tuning system is 1 g movable weight. Factory lofts captured for this model run 9° to 12°.
Callaway Driver Adjustment Guide
Big Bertha Alpha 815
8-way OptiFit • 2015
1 g movable weightWeight system
YesUser-movable CG weight
Exact hosel settings
| Loft mark | Change | Use |
|---|---|---|
| -1 | Stated loft -1° | Lowest marked loft / lower-launch direction |
| S | Stated loft | Factory-loft baseline |
| +1 | Stated loft +1° | More loft / higher-launch direction |
| +2 | Stated loft +2° | Maximum marked loft / highest-launch direction |
Lie cog
| N | Neutral lie; best baseline when start direction is reasonable. |
|---|---|
| D | Draw/upright setting; tends to move start direction left for a right-handed golfer. |
What the weight system actually does: The weighting can tune vertical CG/spin and horizontal heel/toe bias. Keep those two jobs separate when testing.
Weight adjustment
Gravity Core + 7 g / 1 g weights Use the Gravity Core heavy end down for lower CG/lower spin or heavy end up for higher CG/more spin. Swap the 7 g and 1 g sole weights to move CG toward heel or toe for directional bias.
Use impact location before changing settings
| Strike | Typical effect | What to try first |
|---|---|---|
| High face | Often raises launch and reduces spin | If flight is already high and low-spin, do not keep raising the tee. |
| Low face | Often lowers launch and adds spin | Raise tee height slightly before changing loft. |
| Heel | Can add fade/slice gear effect | Improve centred contact before stacking more draw bias. |
| Toe | Can add draw/hook gear effect | Check strike before adding more draw/upright bias. |
How to adjust the hosel
- Support the head and insert a Callaway-compatible torque wrench into the hosel/sole screw.
- Loosen counter-clockwise until the head separates from the adapter.
- Rotate the cog(s) to the desired setting and align the reference marks exactly.
- Fully reseat the shaft; do not tighten it while crooked or partly engaged.
- Tighten clockwise until the torque wrench clicks, then stop.
- Change one variable at a time and test several shots.
Best settings for this specific adjustment system
| Goal | Best first move |
|---|---|
| Higher launch / more spin | Add loft one step and test before jumping to the maximum setting. |
| Lower launch / less spin | Reduce loft one step and test before using the lowest setting. |
| More draw tendency | Use D / Draw-upright after testing loft. Then move heelward only if more draw bias is needed. |
| More fade tendency | Stay at N / Neutral and use the lower/open loft direction if needed. Then move toeward only if more fade bias is needed. |
| Tighter dispersion | Return to the neutral/baseline hosel and stock weight position, map strike location, then change only one control. |
Factory loft choices
| Loft | Best starting use |
|---|---|
| 9° | Lowest-loft option; strongest starting point for players already producing enough launch. |
| 10.5° | Middle-ground factory loft. |
| 12° | Highest-loft option; easiest starting point for more launch and carry. |
Spec combinations and warnings
- The movable weight is a directional-bias tool, not a front/rear launch track. Do not describe heel/toe movement as a separate low-spin setting.
30-second baseline setup
- Start at the neutral/stated-loft setting for this hosel generation.
- Start with roughly half the ball above the crown and mark impact.
- Keep the movable weight in its neutral/stock position while you establish loft.
- Set launch first, then directional lie/face bias, then weight bias.
- Re-check strike after every meaningful setting change.
Common mistakes
- Using an adjustment chart from the wrong Callaway hosel generation.
- Changing loft and movable weighting together, then not knowing which change helped.
- Treating a front/rear weight system like a heel/toe draw-fade slider or vice versa.
- Continuing to tighten after the torque wrench clicks.
- Ignoring heel/toe strike when the real problem is impact location rather than settings.
Disclaimer: Adjustment systems and settings can vary by model, year, region and component configuration. Before loosening the hosel or movable weights, confirm the correct settings, compatible wrench and adjustment procedure in Callaway’s official documentation for your exact driver.