Never one to miss a beat on new groups, the Kogel Kolossos GRX gives you an oversized pulley cage option for Shimano’s latest 12-speed GRX gravel group.
It uses a similar alloy cage construction as their others, but Kogel says this is their stiffest cage design yet. Inside are a 14-tooth upper pulley and 18-tooth lower, both rolling on ceramic bearings with low-drag road seals. Switch to their ‘cross seals for wet riding conditions.
The overall length of the Kolossos is within a few mm of the stock cage, so ground clearance remains similar, but you may need to add a bit of chain length, depending on your setup. Stock Shimano GRX RX820 derailleur pulleys both have 13 teeth, so the Kolossos GRX kit will require more chain wrap.
It comes in gold, red, and black. MSRP $475, available now.