Original 
Shimano middle chainring for 
Sora 3503 triple cranks. The 
Sora 39t middle chainring is designed to be matched with the 
30t Sora inner chainring and the 
50t Sora outer chainring. The 
Sora 3503 triple middle chainring is not to be confused with the 
Sora 3500 39t double inner chainring. The triple chainring is designed to allow the chain to drop below it onto the inner chainring, while the double chainring it designed to be the stopping point. 
- Original Shimano equipment
 - For Sora 3503 triple cranks
 - Does not include chainring bolts