39T

 Precision CNC machined AL7075/T6 Laser etched logo with CNC machined silver detail 130mm 5-bolt 39T 7075AL 10s Triple Black/Silver 10sp StandardUPC/EAN/G...

 Precision CNC machined AL7075/T6 Laser etched logo with CNC machined silver detail 130mm 5-bolt 39T 7075AL 10s Triple Black/Silver 10sp StandardUPC/EAN/GTIN: 400310008428

 Precision CNC machined AL7075/T6 Laser etched logo with CNC machined silver detail 130mm 5-bolt 39T 7075AL 10/11s Black/Silver 10/11sp StandardUPC/EAN/GT...

 Precision CNC machined AL7075/T6 Laser etched logo with CNC machined silver detail 130mm 5-bolt 39T 7075AL 10/11s Black/Silver 10/11sp StandardUPC/EAN/GTIN: 400310065759

 Genuine Sram-Red replacement rings 110mm=Compact 130mm=Standard Road  130mm 5-bolt 39T Black 11sp StandardUPC/EAN/GTIN: 710845729904 ...

 Genuine Sram-Red replacement rings 110mm=Compact 130mm=Standard Road  130mm 5-bolt 39T Black 11sp StandardUPC/EAN/GTIN: 710845729904

 7075 alloy replacement rings 10 speed compatible 130mm 5-bolt 39T Black/Silver 10sp StandardUPC/EAN/GTIN: 4710944245226 ...

 7075 alloy replacement rings 10 speed compatible 130mm 5-bolt 39T Black/Silver 10sp StandardUPC/EAN/GTIN: 4710944245226

 10 speed 7075 alloy replacement rings 130mm 5-bolt 39T Alloy Black/Silver 10sp StandardUPC/EAN/GTIN: 4710944237863 ...

 10 speed 7075 alloy replacement rings 130mm 5-bolt 39T Alloy Black/Silver 10sp StandardUPC/EAN/GTIN: 4710944237863