28-Tooth Mainshaft Gear
The Honda catalog identifies this component as a sixth mainshaft gear with 28 teeth. The tooth count is part of the official description and distinguishes this gear from other transmission gears in the same assembly.
Honda · Genuine OEM Part
Honda part 23511-MKR-D10 is a 28-tooth gear installed on the transmission mainshaft. Honda identifies it as GEAR, MAINSHAFT SIXTH(28T), distinguishing it from the separate sixth-gear countershaft gear listed in the same transmission assembly. As part of the transmission gear train, the sixth mainshaft gear meshes with its corresponding gear to transmit power through the highest listed gear position. The exact Honda part number identifies the specific gear and tooth count required for accurate parts ordering.
The Honda catalog identifies this component as a sixth mainshaft gear with 28 teeth. The tooth count is part of the official description and distinguishes this gear from other transmission gears in the same assembly.
It is cataloged alongside the mainshaft, countershaft, sixth countershaft gear, spline collar, and thrust washers.
The complete Honda number 23511-MKR-D10 should be used when ordering. Nearby transmission components have different part numbers and tooth counts, so a shortened description such as GEAR (28T) is not sufficient for identification.
Honda's parts catalog places 23511-MKR-D10 in the transmission section and names it GEAR, MAINSHAFT SIXTH(28T). The same listing separately identifies the sixth countershaft gear as a different component, confirming that this part belongs on the mainshaft rather than the countershaft. No directional supersession statement was found in the pages reviewed, so no older or newer replacement number is assigned here.
| Honda Part Number | 23511-MKR-D10 |
|---|---|
| Honda Catalog Description | GEAR, MAINSHAFT SIXTH (28T) |
| OEM Catalog Description | GEAR, MAINSHAFT SIXTH(28T) |
| Part Type | Gear |
| Assembly | Transmission |
| Tooth count | 28T |
| Catalog-listed quantity | 1 |
| Model | Type | Model Years |
|---|---|---|
| CBR1000SP | Motorcycle | 2021–2023 |
Model applications as listed in Honda's dealer parts catalog for part number 23511-MKR-D10.
Verify the Honda OEM part number for your specific model before ordering.
Compatible motorcycles, ATVs & side-by-sides
Verify your vehicle's model, year and specific configuration before ordering.