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 drivesCargo Line Cruise BDU450 CXCargo Line Speed BDU490 PPerformance Line Speed BDU490PPerformance Line CX BDU450 CXIf 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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