Thread: Birdy thread
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Old 07-28-22, 03:35 AM
  #2062  
Jipe
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Shimano changed the spider of their crankset many years ago from 5 arms BCD130 for double like 53-39 and BCD110 for compact 53-36 and 50-34 to a proprietary 4 arms.

You need to find a 5 arm BCD 130 53-39 set of chainrings in Dura-Ace or Ultegra or 105.

There are also compatible sets of chainrings from Specialite TA or Stronglight you will also probably need longer chainrings mounting bolts (the original ones are for a single chainring) but your mechanivs will most probably have that in stock.

I definitely advise to not change the crankset as it will most probably change the chainline !
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