High-performance gearbox from the FAIO/EGIG development line. Plug-and-play installation in the original smallframe housing, designed for very high-torque engines. New in this version: auxiliary shaft with polygon connection for matching clutches and a reinforced, CNC-machined main shaft.
| Gear | Tooth pair | i | 
|---|---|---|
| 1. | 11 : 52 | 4,73 | 
| 2. | 13 : 42 | 3,23 | 
| 3. | 15 : 38 | 2,53 | 
| 4. | 18 : 37 | 2,06 | 
| Gear | Tooth pair | i | 
|---|---|---|
| 1. | 10 : 58 | 5,80 | 
| 2. | 14 : 54 | 3,86 | 
| 3. | 18 : 50 | 2,53 | 
| 4. | 22 : 46 | 2,09 | 
Note: identical gear family as X-TRA S / X-TRA LARGE; X-TRA STRONG differs in width and shaft package (polygon secondary shaft, reinforced CNC main shaft).