OSPW C26 series replaces C35 series, introducing the X-ODON narrow-wide teeth technology into the smaller big pulley series for the first time.
The standard C26 model includes Forged Carbon pulleys with ceramic ball bearings. As an option, full ceramic bearings can be chosen. On the contrary, if you want to put some color in your rides, alloy 7075 pulleys can be chosen as an options in black, red, gold or silver color.
| P/N | Compatibility | Guide/tension pulley Inertia | Bearings | Warranty | Optional |
| RD6 C26 | Dura-Ace R9200-9100-9150 Ultegra R8100-8000-8050 | 12/16 x2,4 | 689-C (12T) 699-C (16T) | 2 years | Alloy pulleys FC bearings |
| RD1 C26 | Dura-Ace 7900-9000-9070 Ultegra 6700-6800-6870 | 12/16 x2,4 | 689-C (12T) 699-C (16T) | 2 years | Alloy pulleys FC bearings |
| RD7 C26 | 105 R7000 | 12/16 x2,4 | 689-C (12T) 699-C (16T) | 2 years | Alloy pulleys FC bearings |
| RD2 C26 | 105 5700-5800 Tiagra 4600-4700 | 12/16 x2,4 | 689-C (12T) 699-C (16T) | 2 years | Alloy pulleys FC bearings |
*Bearings legend: FC are Full Ceramic bearings (ceramic balls and races); C are Ceramic ball bearings (steel races).
PHYSICS BEHIND BIG PULLEYS
The mass moment of inertia “I” is a measure of an object’s resistance to change in rotation direction. Its equation (I=mr2) where“m”is the mass (of the chain) and“r”is the radius (of the pulley) shows that with a bigger pulley (i.e. radius) you also get a bigger mass of the chain interacting with the pulley, resulting in a higher mass moment of inertia than with standard size pulleys.
The higher the mass moment of inertia is, the more momentum you can create and keep while pedaling at the same intensity. Therefore, Ridea OSPW evo helps you save energy to ride faster and longer.
FORGED CARBON COMPOSITE
Forged Carbon is the ultimate material for oversized pulley wheel systems and a far better alternative than alloys and plastics commonly used in the industry.
Forged Carbon is lighter than alloys to compensate the bigger size of the pulleys and cage system, while being harder and more durable than plastics.
Its elasticity and tensile strength allow a precise guiding and engagement of the chain. More importantly, we can design the bearings with minimum play to reduce friction, maximizing the energy savings of the overall system.
X-ODON
First developed by Ridea in 2010, the X-ODON technology of narrow-wide teeth is available for all pulleys with an even number of teeth (E60, F60, E48 and C26 series).
The teeth design, shaped with different lengths and angles, ensures a smooth engagement between the chain and the pulleys. Therefore, the X-ODON technology plays a fundamental role in making a rear derailleur cage with minimum play among its parts, reducing noise and increasing the overall performance of the system.