CeramicSpeed OSPW X Shimano GRX RX820

$629⁰⁰

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Color

Black Gold Red

The CeramicSpeed OSPW X Shimano GRX RX820 typically ships in 5-8 business days

CeramicSpeed | SKU: 113777 | Option: Black

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

Usually ready in 24 hours

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CeramicSpeed OSPW X Shimano GRX RX820 Info

The CeramicSpeed OSPW X Shimano GRX RX820 is a direct pulley cage upgrade built specifically for gravel and cyclocross, sized to bolt onto Shimano's 2x-specific GRX RX820 and RX825 rear derailleurs. CeramicSpeed sets the OSPW X apart from a stock cage with a 13-tooth upper and 19-tooth lower pulley wheel design, a larger setup than stock that reduces the angle the chain wraps through and cuts friction as a result — CeramicSpeed rates the system at a 35-40% friction reduction over a stock pulley configuration.

The platform has been proven in some of the harshest conditions in the sport, with riders running OSPW X systems at races like Paris-Roubaix, Strade Bianche, and CX World Cups, events that put a drivetrain through mud, grit, and repeated hard impacts. The pulleys run on CeramicSpeed's handbuilt hybrid ceramic bearings, chosen for low friction that holds up over the kind of off-road miles a road-only pulley wheel was never designed to handle.

The cage itself is a custom molded carbon fiber build, kept lightweight without sacrificing the durability gravel and cross riding demands, and four spring tension settings let you dial in cage stability to match your terrain. If you're running a 1x setup off this cassette range, the system supports up to a 36-tooth cassette. It's available in Black, Gold, and Red, and it's a straightforward way to lower drivetrain friction on a GRX RX820 build without changing anything else in your groupset.

The RA Perspective

We sell this as the entry point into CeramicSpeed's OSPW X line for GRX riders — it gets you the same race-proven cage design and bearing performance as the coated version, just without the extra durability upgrade for riders who don't need it.

The 13/19 tooth pulley sizing is the detail that actually moves the needle here. It's a bigger change than swapping in aftermarket ceramic bearings alone, since the larger pulleys reduce chain wrap angle on top of the lower-friction bearings.

If you're riding in consistently wet or muddy conditions — cyclocross specifically comes to mind — it's worth considering the coated bearing upgrade instead, since standard bearings will show wear faster when they're regularly exposed to grit and moisture. For drier gravel riding, this standard version holds up well.

We'd recommend this to gravel riders running GRX RX820 who want a real friction reduction and don't need the added corrosion resistance of the coated bearing option.