Unique “thumb flange” makes it easy to apply pressure to the tire bead

linear straight line tread

outer rings have PowerGlide pins/ramps

allowing between 0-15 degrees of float

SHIMANO 105 R7100 Crankset - 2 x 12-Speed - 50-34t - 172.5mm garminpromo Unique “thumb flange” makes itThe newly designed crank arms offer an optimized balance between lightweight and efficiency. The crank, formed with hollow aluminum technology, is anodized with a beautiful gloss black anodized finish, giving it a luxurious look. The resin ribs on the back of the chainrings are SHIMANO 105's unique structural design that achieves both thorough weight reduction and crisp shifting performance.