po-YAHG-ee is how I would try to phoneticize it (if that's a word)...closer to 3 syllables, not 4, as the middle part gets "run together".

Japanese words usually are pronounced (correctly) with virtually NO stress to any syllables, so Nishiki has no accent on either the 1st, 2nd or 3rd...this is very difficult for English speakers to get the hang of, and probably even harder for Italian speakers!

3 (San) Rensho = commemorates 3 consecutive wins (victories) in one race-day for Yoshi Konno's bikes, there were probably lots on Ichi (1) Rensho and some Ni (2) Rensho, but they were not a big enough deal to name a bike for them...now let some Japanese speakers correct my spelling and grammar, I'm sure I got something wrong!

The "chucee" in Italian pronunciation clip above is for "Ciussi", the water bottle cage.