we are also going end of july and have spoken with the bardonecchia commune to clarify exactly which roads are opena nd which are not because i have found a lot of mixed info.
remember that nearly every military road that goes from italy to france are closed
you also may have heard the story of the guys that were caught on a closed road, the police took their bikes away with a helicopter and the guys had to walk back to the village for several hours and pay a huge fine.....
make 100% sure the roads you are going on are allowed as the signs are not always there to say the roads are closed - you just have to know!!
best to phone the commune or tourist info and they will give you the correct info - it will be safer!!