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Chainring holes with thread.
Shimano biopace 50 chainring , brown colour,BCD 110
53t. made for 39t. For 5 arm crank. Super deal !
Stronlight road chainring 53 , BCD110
TIOGA 5 arm 110BCD 52 Road chainring for 6-7-8 speed
chainring bolts included , BCD110 11 speed chainrings but wotks perfect with 10sp. chain also.