Bicycles Asked on October 13, 2020
I want to change to a 165 mm crank length on the drive side of my Dura Ace Octaplus FC7703 triple chain set. Can I use a drive side Dura Ace Octalink FC7710 track crank to do this? Are the two crank sets compatible? Thanks
The FC7703 triple crankset uses an Octalink 118.5mm bottom bracket
The FC7710 track crankset uses an Octalink 110mm bottom bracket
If you want to use the track crankset, you would need to change the bottom bracket to the correct one.
Answered by abdnChap on October 13, 2020
It looks like the FC7710 chainrings are 144mm BCD (from ebay chainring Y16S45001 listing) while the FC7703 has BCD 133mm (from ebay listing https://www.ebay.com/c/15025379322 ) Thus, OP could NOT replace his drive side FC7703 crankarm with a FC7710 165mm crankarm and transfer the chainrings over.
Answered by Armand on October 13, 2020
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