Well I would think "Bianchi" would be pronounced similarly to "Bee-on-key" like in "chianti." As for Mavic, I've always said something like "MAA-vick" or just "Ma-vik." They should know what you're talking about and I do speak French, and am a loss for words w/ "-ic" that are pronounced "-vee." Maybe it was like "MAA-veek" like in "electronique." Just my 2 cents.