Shimano, Y1KN98040, 38T, 8sp, BCD: 104mm, 4 Bolt, Acera FC-M361, Middle Chainring, For 28/38/48, Steel, Black

Wheels Manufacturing, Chainring spacer kit 18-Compartment Plastic Box

Wheels Manufacturing, 3-Bolt T-Type, Chainring, Teeth: 30, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, Aluminum, Black

SRAM, X-SYNC 2 107mm, Chainring, Teeth: 40, Speed: 12, BCD: 107, Bolts: 4, Single, Aluminum, Black

SRAM, Road Thread Mount E1, Chainring, Teeth: 40, Speed: 12/13, BCD: Thread Mount, Aluminum