Shimano dura ace fc7800 double chainringsreplacement 10spd alloy chainring suitable for use with the shimano dura ace fc7800 double chainsets features10 speedbcd 130mmplease note type a and b are not cross compatible you must run a with a and b with compatible chainring ratiosa type 5342t54 42t for ttta55 42t for tttab type 5039t5239t53 39te type 56 44t for tttaa 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr p