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Works with 110 BCD chainrings with 38t-43tThe S!LVER guard sits close to the chainring, so it totally prevents the chain from jamming between the outer ring and itself.
Cartridge Bottom Bracket
Chainring - 110 x 34t
Chainring - 110 x 36t - 12013
Chainring - 110 x 38t - 12014