The mechanic told me that I need to change the rotors for my brakes (which makes sense I guess, since the bike is 7 years old and has been used quite a lot). The bike is at 2016 giant reign, the brakes are Shimano Br-M615. The rear rotor says "Avid 180mm hs1", the front one is Shimano and is 203 mm wide. Both have six screws.
The mechanic charges me €30 for each rotor, which after a quick search seems like it's quite expensive. So my question is which specs do I have to watch out for when buying new rotors online. Also if you have any suggestions about where to buy them. I live in Europe and usual shop from bike discount. I found a few with the same diameter and number of screws, but the specific model for my brake is not listed as compatible.
Thank you