Shimano tiagra fc4600 10sp double chainringsfor use with shimano tiagra fc 4600 10spd double chainset featuresteeth 52 39tbolt circle diameter 130mm 5 arm chainringweight 180ga 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano components from chain reaction cycles the worlds largest online bike store