Adjustable Crossbar Top Tube Frame Adapter: Black Ground control Helix Race e*spec Chainrings merge

Helix Race e*spec Chainrings merge cutting-edge design and performance

Ideal for use 5 minutes before training or competition

T-slot attachments make adding gear mounts and accessories fast

Replacement 11t and 13t cogs for microSHIFT Advent X 10-Speed cassette

Adjustable Crossbar Top Tube Frame Adapter: Black Ground control Helix Race e*spec Chainrings mergeThe Crossbar Substitute works as a top tube for easier rack mounting for use with hang on type car racks and unconventional frames. For use with "hang on" type car racks Quick release clamps allow for quick and easy adjustment Thick rubber coating protects bike's finish Weight limit is 50lbs Distance limit from seat post to stem: max: 32. 25", min: 23"