absoluteBLACK HOLLOWcage Carbon Ceramic Oversized Derailleur Pulley Shimano 9250

absoluteBLACK HOLLOWcage Carbon Ceramic - quiet and highly efficient oversized derailleur pulley system for Shimano R9250

The HOLLOWcage derailleur pulley system by absoluteBLACK - here in the version for the Shimano Shimano Dura-Ace Di2 R9250 12-speed rear derailleurs - has a super-light, single-sided carbon polymer cage and super-quiet running derailleur pulleys with oversized ceramic bearings. It is characterised by top shifting performance with extremely low noise development. The secret is the built-in Xring rubber ring, which dampens the impact of the chain on the teeth of the idler pulley, eliminating the biggest source of annoying rear derailleur noise. With the absoluteBLACK Silent-Xring pulleys, your bike ist therefore significantly quieter than with conventional polymer or aluminium derailleur pulleys and approx. 40% (or at least 5 decibels) quieter than with the original Shimano shifting cogs. Full ceramic bearings are used, i.e. both the bearing balls and the raceways are made of ceramic. This way you benefit from maximum efficiency, long durability and mileage. Ball bearing cage and seals are made of low-friction polymer. The minimalist HOLLOWcage made of carbon and polymer and its colour-contrasting lower lockring create a spectacular look. It also contributes significantly to the fact that the whole system does not weigh much more than 70 grams.

Specifications:

Application:

Road, Triathlon & Time Trial

Gearing:

12-speed

Cassette Teeth (max.):

34-tooth

Technical Information:

Derailleur Pulleys:

12 tooth (upper derailleur pulley), 18 tooth (lower derailleur pulley)

Cage Material:

carbon, polymer

Other Materials:

aluminium (7075), rubber

Bearings:

Ceramic

Compatibility:

• Shimano Dura-Ace Di2 RD-R9250

Features:

• derailleur pulley system with one-piece carbon polymer cage and oversized, ceramic bearing-mounted pulleys
• Silent-Xring idler: 5 to 7 decibels (or 40 %) quieter than original pulley thanks to the built-in X-ring rubber ring for damping chain guide noise
• highly efficient all-ceramic bearings (balls made of silicon nitride ceramic, raceways made of zirconium oxide ceramic) with cage and seals made of low-friction polymer
• top shifting performance at the same level as the original
• weight saving through open mono-plate construction of the carbon-polymer cage
• lower lock ring in contrasting colour for a spectacular look
• three spring tension options

Note from the manufacturer:

For Compact and Sub-Compact chainring increments (i.e. up to 34-50 t), select the lowest spring tension option (first hole from the left). However, when riding on rough surfaces such as cobblestones, roads with potholes, etc., it is recommended to set the high spring tension option (first hole from the right). Select the high spring tension for a chainring size of 52 teeth or larger.

Manufacturer Numbers:

black:

TCRCAGEDA92/BK-BK

titanium:

TCRCAGEDA92/BK-TI

red:

TCRCAGEDA92/BK-RD

gold:

TCRCAGEDA92/BK-GL

rainbow:

TCRCAGEDA92/BK-RB

Contents:

• 1 x absoluteBLACK HOLLOWcage Carbon Ceramic Oversized Shimano 9250 derailleur pulley system
• 1 x lockring tool
• 2 x absoluteBLACK Xring replacement rubber rings