Chainring, Gates CDX, STePS spider, 39TOptional 39t front sprocket for Nexus 5s Di2 The 39t front sprocket is meant for lowering the gear ratio just a little, to either move the use pattern to heavier gears or for a higher cadence. Shimano E bike systems will need to be reprogrammed when installing this 39t sprocket Contact either us or Shimano for this. 42t is the standard oem size for Nexus 5s Di2. Gates Carbon Drive CDX Size: 39t Content: Preassembled 1x Spider 4x chainring bolts 39t
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