diff --git a/Hub-Motor-Measurements.md b/Hub-Motor-Measurements.md
index 6ad6b1b..9d32d09 100644
--- a/Hub-Motor-Measurements.md
+++ b/Hub-Motor-Measurements.md
@@ -4,17 +4,21 @@
 **Measured by:** Tee (digital caliper)
 **Motor:** 8" / 10x2.125 hoverboard hub motor (brushless, FOC ESC)
 
-## Axle Profile (Stepped / Keyed)
+## Axle Profile (Stepped / D-Cut Shaft)
 
-The axle has a **stepped profile** — wider base near the hub, narrower keyed section for dropout clamping.
+The axle has a **stepped profile** — wider base near the hub, narrower D-cut shaft above.
 
 ```
         ┌─────────┐
-        │  15.35  │ ← flat-to-flat (top)
+        │   3mm   │ ← tip / shoulder
+        ├─────────┤
         │         │
-        │  ø13mm  │ ← keyed shaft section
+        │ ø15.95  │ ← D-cut shaft diameter
+        │  (D-cut │   (flat on one side, 13mm across flat)
+        │  13mm   │
+        │  flat)  │
         │         │
-        │ 43.35mm │ ← keyed section length
+        │ 43.35mm │ ← D-cut section length
         │         │
         ├─────────┤
         │  ø16mm  │ ← base section (measured 16.11mm)
@@ -22,27 +26,28 @@ The axle has a **stepped profile** — wider base near the hub, narrower keyed s
         └─────────┘
         ─── hub face ───
 
-        Total protrusion: 63.5mm
+        Total protrusion: 65.5mm
 ```
 
 ## Measurements
 
 | # | Dimension | Value | Notes |
 |---|-----------|-------|-------|
-| 1 | Axle base diameter | **16.11 mm** | Near hub face |
-| 2 | Axle keyed section diameter | **~13 mm** | Narrower upper section |
-| 3 | Total axle protrusion | **63.5 mm** | Hub face to tip |
-| 4 | Keyed section length | **43.35 mm** | Upper shaft only |
-| 5 | Bearing seat OD | **~37.8 mm** | Hub center collar |
-| 6 | Flat-to-flat width | **15.35 mm** | Anti-rotation flats at top |
-| 7 | Base section length | **15 mm** | Lower stepped portion |
+| 1 | Axle base diameter | **16.11 mm** | Round section near hub face |
+| 2 | D-cut shaft diameter | **15.95 mm** | Round diameter before D-cut |
+| 3 | D-cut flat width | **13 mm** | Across the flat |
+| 4 | Total axle protrusion | **65.5 mm** | Hub face to tip |
+| 5 | D-cut section length | **43.35 mm** | Upper shaft |
+| 6 | Base section length | **15 mm** | Lower stepped portion |
+| 7 | Tip/shoulder | **3 mm** | Feature at top of shaft |
+| 8 | Bearing seat OD | **~37.8 mm** | Hub center collar |
 
 ## Tire Specs
 - Inflate to **35 PSI** (240 kPa / 2.5 BAR)
 - Size: 10x2.125 pneumatic
 
 ## Design Implications
-- **Dropout clamp** must accommodate stepped profile: 16mm bore at base, 13mm keyed slot above
-- **Anti-rotation** via flats (15.35mm flat-to-flat) — design dropout with matching D-profile
-- **Axle length** (63.5mm) gives room for dropout plate + nut + washer
+- **Dropout clamp** must accommodate stepped profile: 16mm bore at base, D-cut slot above
+- **Anti-rotation** via D-cut flat (13mm across flat on a 15.95mm shaft)
+- **Axle length** (65.5mm) gives room for dropout plate + nut + washer
 - **Bearing seat** (37.8mm OD) — allow clearance on inner face of mount