For Shimano

TIPS:1. Currently, the Double chainring products in production do not support small chainrign with small cog gears. In this case, using the chain will scrape the upper chain rivets of the larger Chainring2. The BCD110RB series Double chainring s support R71000/R81000/R9200 cranks, but the position and size of the claws of these cranks are different. The Chainring design is aligned with the claws of the R8000 cranks. Therefore, the positions of the other crank claws are not aligned.3. The product must be installed and used in one set, and cannot be used interchangeably with any other brand, and cannot be provided as repair parts for other brand products.For example: the products BCD110RB-5236 and BCD110RB5034 are dual-disk, which can only be used in 52T+36T, and do not support mixed use such as 50T+36T or 52T+34T.BCD110RB2 fit for R7100 R8100 R9200Includes: 1pcs double chainring ,come with alloy bolts.,Circle ( round ) shapeCompatible with BCD 110mm 4 arm chainring, fit for 105 R7100 , Ultegra R8100 Dura ace R9200 cranksMaterial: AL7075-T651 Full CNC madeTeeth&Weight:50/34T 159g, 52/36T 167g; fit for 9s 10s 11s, also shimano 12 speed, can NOT use for SRAM AXS 12 speedNew teeth 55-40TThe large chainring optimizes the winding efficiency, and the number of winding nails is increased to 10, which greatly improves the efficiency.On bike review: