| Model | FC-R8100 |
| Reference supplier | IFCR8100EX04 |
| Type | Double |
| Denture plateau | 50/34 dents |
| Longueur manivelle | 175 mm |
| Entraxe BCD (Ø fixation en mm) | 110 |
| Nombre de branches | 4, asymétriques |
| Number of compatible speeds | 12, 2x12 |
| Type d'axe | Traversant, 24 mm |
| Q factor | 148 mm |
| Ligne de chaîne | 44,5 mm |
| Largeur boitier / longueur axe | 68 / 70 mm |
| Main colour | Black |
| Matière Plateau | Aluminium |
| Technologie | Hollowtech, Hollowtech II |
| Weight in grams | 700 |
ULTEGRA FC-R8100
Speeds: 2x12
Chainrings: 50-34 teeth / 4 spokes
BCD (center distance): 110 mm asymmetrical
Cranks: 175mm
Axle: Hollowtech II (Ø 24mm)
Chainline: 44.5mm
Q factor: 148mm
Weight: 700 g