Rotor Round Spidering Direct Mount Chainrings

Rotor Round Spidering Direct Mount Chainrings Info

Rotor’s Aldhu Direct Mount Q Ring Oval Chainrings, aka the Q Ring Spidering, is an impressive feat of machining. More importantly, it is light, stiff, simple, and durable, and adds up to a super-light, super-stiff drivetrain component.

The Spidering begins life as a block of 7075 aluminum. It is then machined down to create a one-piece four-arm spider and two chainrings. The teeth are machined to ease shifting. There are ramps and pins on the inside of the big ring to help lift and drop the chain quickly and securely.

The ovality of the Q Ring Spidering is 12.5%. Thanks to the design where you press the splined center of the Spidering onto the splines of the bottom bracket spindle, the Spidering can be adjusted in one-degree increments. Thanks to this, you can precisely time the largest point of the oval with the strongest point of your pedal stroke. You can find Rotor’s Optimal Chainring Position (OCP) 1, 2, 3, 4, and 5. You can even set up the rings to work like the ill-fated Biopace design of year’s past, which is pretty much the opposite of what Rotor has found to be most efficient.

The Spidering attaches to the Rotor Aldhu bottom bracket via a circle of splines at the center. It is then secured into place by the Aldhu right crank arm.

The Rotor has found this design saves 30g over a standard chainring plus spider. And that’s when comparing it to their already ultra-light offerings. The 52/36 NoQ Spidering weighs 178g. When you take 170mm Aldhu crankarms and add the 50/34 NoQ Spidering, the set weighs 599g.

The chainring ratios available for the Rotor Aldhu Q Ring Spidering Direct Mount are 53/39, 52/36, and 50/34.