Technical Q&A with Lennard Zinn – Readers ask, Lennard answers
Dear Lennard,
I would like to change my Dura-Ace 7800 53/39 crank set for a compact 50/34 set and am considering the new Shimano 7950 but noticed that Shimano states that to run the 7900 crank set, the new 7900 chain and front derailleur are also required. Can I not simply put a 7950 compact crank set on my 7800 system and if so, will shifting be compromised? If indeed the new front derailleur is required, do I then need to change my shifters to 7900 as well?
Paul