I was taught that when selecting a replacement hub cone the profile/curve of the replacement cone has to be identical as well as all the other fit issues. There are situations when a replacement cone with a different profile can be installed. The only reason that I can think of for suggesting never using a cone with a different profile is that it would lead to premature bearing failure. Can anyone confirm this and explain why or offer a different reason? Is it related to scuffing? Has anyone tried installing cones with a different profile and had good luck?
Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Hase Kettweisel Tandem (redundent recumbent), Merin Bear Valley (The gopher).
Hub seals, dust covers and spacing can all be affected by mix-and-match cones. I can work around the spacing but I don't want to return to the days of hubs without sealed bearing mechanisms.
I just went through that with a customer bike last week. I didn't have the right replacement for his pitted cone so his decision was to leave his bike with me for another week until I could get the right one. If you have a Shimano hub they're get-able and they're affordable. It's just a PITA looking up the right one.
I've successfully replaced cones with ones of different profile, no problem. But it depends on how much you care about your bike. I don't really own any that I wouldn't mind buying new wheels for in 10 years.