SRAM X-SYNC 2 12 Speed Direct Mount Chainring - Direct Mount - SRAM Direct Mount - 3mm Boost - Round - 38T - 11-12 Speed - Grey - Alloy YGroup_7033397313581 they have BST technology which

they have BST technology which matches the profile of your tyre bead to lock tyres in place

Combined TPU/ripstop welded upper

Backsweep：9º

and comfortable• 4-way stretch provides freedom of movement and superior comfort• UPF 50+ is designed to provide excellent sun protection coverage against UVA and UVB rays• Exceptional Breathability promotes air flow to keep you cool

SRAM X-SYNC 2 12 Speed Direct Mount Chainring - Direct Mount - SRAM Direct Mount - 3mm Boost - Round - 38T - 11-12 Speed - Grey - Alloy YGroup_7033397313581 they have BST technology whichSince day one, SRAM has been dedicated to providing riders with component options that fit their own individual riding style. It's undeniable that some riders pedaling styles benefit from oval chainrings, so we've engineered the new X SYNC 2 Oval chainrings to give them the advantage they want. They are the only oval option available with our genuine X SYNC 2 teeth profile, so they are the only oval chainrings on the market that are 100 percent