E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Purple - 9-50T - 12 Speed YGroup_7033823756333 The inside of the flap

The inside of the flap is made from exterior material (so when folded up it's protected against the weather/sun) this does mean if you leave it down

Pockets Position and Quantity: Two slanted front zip pockets with locking YKK zippers

Works with all brakes available for Shimano STEPS (both disc and rim brakes)

Features suggested cut down marks

Fits all TWIST bases

E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Purple - 9-50T - 12 Speed YGroup_7033823756333 The inside of the flapThe HELIX R Cassette is an upgrade to any SRAM Eagle or Shimano drivetrain, with more range than any other cassette on the market. The 9 tooth cog lets you step down one chainring size while keeping the same top end gearing and provides not only better ground clearance but an overall lighter drivetrain. The improved tooth profile of the Helix cassette's features Shimano 12 speed level shifting performance with the improved reliability of a steel and