It surrounds / protect the driver sprocket, prevents building-up of mud and avoid chain-lock issues on the chain transmission system in extreme muddy conditions. This item is for the (BDU2XX) Bosch ebikes motor units. (NOTE: THE 4X PICTURES OF DEVICE FITTED and NOT FITTED ON MOTOR UNIT ARE FOR VISUAL REFERENCE ONLY).The item "ANTI CHAIN SUCK DEVICE FOR BOSCH ELECTRIC E-BIKE PERFORMANCE CX DRIVE MOTOR UNIT" is in sale since Sunday, December 22, 2019. This item is in the category "Sporting Goods\Cycling\Bike Components & Parts\Electric Bike Components". The seller is "scuffwheels" and is located in Stevenage, Hertfordshire. This item can be shipped worldwide.