The chain ring "B-SP" from CONTEC is intended as a replacement for the chainrings of Bosch drives of the 1st and 3rd generation. The 4-arm are made of aluminum and have a bolt circle of 104 mm accordingly. Available in the gradations with 36, 38, 40, 42 and 44 teeth. CONTEC recommends that the assembly be carried out by a specialist dealer.
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