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Ari Bike Rotor REX spiderless rings get official, available now

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After a sneak peek earlier this year, Ari bike is now spinning their newest CNC chainrings. This time, they’re for the Rotor REX 1 and 2 cranksets, which as a spiderless option Ari claims is an industry first. Why does that matter? Well, if you’re running a single chainring on the REX cranks it means you’re limited to their odd bolt pattern, and stuck using extra hardware in the form of chainring bolts to do the same job. Ari’s chainrings eliminate the spider and mount directly to the cranks in one of two offsets and in round or oval…


Made to fit the proprietary spline design for Rotor REX 1 and REX 2 cranksets, the Ari Spiderless rings are a direct replacement of the original spider. To do so, you’ll need to make sure you have the original Rotor spline tool, or order one from Ari Bike. Note that there are two different tools based on what size spindle the crank uses (24mm or 30mm). Ari sells both versions for €55 each.

In addition to the removal tool, you’ll have to decide whether you want to run a ring with the original offset, or what Ari claims is an improved offset with the chainline moved inboard an unspecified amount. The rings are available in round or oval profiles and in their typical STRONG or RACE build with the former billed as more durable and the latter being lighter weight. Available in even tooth counts with a narrow wide pattern from 26 to 46t for the round and 28 to 46t for the oval, rings are sold in one of 13 colors and in specific versions to fit 9, 10, 11, or 12 speed drivetrains (specify what speed when ordering). Pricing starts at €100 for the round rings, and €110 for the ovals, available now.


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7 years ago

Why the four holes ?
The design doesn’t look weight/strenght/stiffness optimized…

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