Shimano ultegra fc6700 10sp double chainringsgenuine shimano replacement part for use with shimano ultegra fc 6700 10spd compact double chainset 52 39tcan also use 52t outer chainring from fc 7900 or fc 5700 these are a b match which indicates that the parts are usable but differ in materials appearance finish size etc featuresbcd 130mmhollow forged reduces flex for more responsive shifting and better power transfera 2 year warranty is offered with all shimano products from chain r