Miranda Spider for BOSCH Drive Units of the 4th generation is made of aluminium and is used to mount the chainring on bikes with Boost standard. The bolt circle is 104mm. The weight is 54gCompatible with the following drives:Cargo Line Cruise (BDU450 CX)Cargo Line Speed (BDU490 PPerformance Line Speed (BDU490P)Performance Line CX (BDU450 CX)If you have a Bosch Gen4 eBike with a narrow rear triangle (135mm hub installation width), you will generally need the Bosch Spider without Boost.

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