Shimano deore m590 top swing 9sp front mechhigh performance components for serious cycling fun deore is designed to appeal to a wide range of cycling fans features easy access clamp design wide link design multi clamp dual pull construction hyperdrive system component 50mm chainline angled clamp bolt position better clearance between tire and fd inner chain guard refined for suspension designs a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura