OEM manufacturer SRAM Derailleur Kit - Factory Selling Plastic Roller With Steel Wheel For Sliding Door – Kactus Sports

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12/18T Oversized pulley system

Save up to 45% friction resistance, compare to 11T pulley

Ceramic bearing version saves more than 2.2 watt power on average, compare to original transmission

shifting speed increased by 20%-26%

Color: Anode red, enamel, blue, gold, green

Full carbon fiber cage

Full 7075 aluminum alloy CNC lightweight pulley

18TSRX suitable for SRAM X1 XX1 GX NX Ceramic bearing

Ceramic bearing version hybrid ceramic bearing version NSK steel bearing version

Weight: 59g

Ceramic bearing version weighs 1.2g less.

This is the only full carbon fiber oversized pulley system for SRAM 1X on the market, made of reinforced TORAY carbon fiber from Japan, thickened with OFFSET design, which keeps the position of the pulleys in perfect match with the original SRAM pulleys, ensures the shifting feel.

The RD base is 3D scanned, to make sure the contact parts are perfectly matched, leaving the RD stability intact.

Lower lotus tooth pulley, upper pulley maintains in the exact position as the SRAM original pulley, you can enjoy low friction resistance pedaling without having to worry about chain length or cassette compatibility.

Why replace derailleur pulley

First, replace the original pulleys with these would improve the weak stretch of the original set, and make the up and down chain tension between guide wheel and cogs much more adequate.

Second, the number of contact tooth or control tooth between chain and cogs of 17T is more during gear shifting, the more contact, the stronger the control power. 

Third, after redesign the cage’s rotation curve, the distance between upper guide wheel and the cogs is improved.

Long story short, with all the features mentioned above, you would save 2.2 watts or more with each pedaling. That’s the equivalent of shaving 100g off a 10KG bike.