Product Condition The Dzero DUB XX1 Power Meter Spider is in Excellent condition The Quarq Dzero DUB XX1 Powermeter Spider is in Excellent condition The spider was previously owned for approximately 1 week The following observation has been made about this item The spider is very clean There are very light scratches from chainring installation Chainring bolts and crank arm mounting bolts are included Item sold as is All warranties voidSize Unisex 148mmColor BlackRetail Cost 61100Quarqs DZero platform has proven to be one of the most accurate and reliable power meters on the market with its ability to measure right and left side power within - 15 accuracy Recently Quarq decided to upgrade the power meter chassis by integrating SRAMs DUB technology into the crank arms The result is a stronger stiffer and lighter crankset that more efficiently transfers the effort from your legs into forward momentum on your mountain bike To take advantage of the complete setup you need this Dzero DUB XX1 Power Meter Spider as well as a set of the new DZero DUB XX1 crank arms Once you have these two components all you need is a SRAM X-Sync 2 chainring and youre ready to hit the trailsAlong with these hardware changes comes a new firmware that employs MagicZero auto-calibration technology With MagicZero the system automatically calibrates itself as you ride You no longer need to backpedal to zero the power meter and you no longer need to manually calibrate your head unit either We see this as a welcome relief as it simplifies the power meters operation allowing riders to shift more of their focus to riding and training Additionally all power meter related functions have been shifted to the SRAM AXS app Not only does this give you full control of all AXS components on your bike but it allows you to set the power meters zero offset check battery levels run diagnostics and perform firmware updates The previous software used for this function Qalvin BLE has been discontinuedThe DZero DUB Power Meter Spider uses a 4-bolt chainring pattern that pairs with SRAM X-Sync 2 chainrings Its designed to fit 11- and 12-speed SRAM mountain bike drivetrains And like we mentioned above it must be paired with the Quarq DZero DUB crank arm assembly The assembly is sold separately and comes with a set of carbon cranks arms in multiple length options as well as the SRAM DUB spindle You will also need to purchase a DUB bottom bracket that fits the bottom bracket shell of your frame if you dont already have one They are available in multiple standards to fit vitually any modern bicycle frameDzero DUB XX1 Power Meter Spider DWGAP2H