Cassette mix&match

[E38]

So I have a 52/36 12-25 at the moment, but want a back up gear or two for the alps.

I have a new 11-28 sitting around, also 5700 like the slightly less new 12-25.

Im not sure if I need 52-11, I top out 60kph anyway so is it ok to make a combo of 12-28 and keep the 16T middle sprockets.... It should work, but shifting wont be affected?


So

12-13-14-15-16-17-19-21-23-25
+
11-12-13-14-15-17-19-21-24-28
=
12-13-14-15-16-17-19-21-24-28

?

[E38]

No faffing with rivets, I'm just proposing to use the the 12-25, just with the final 3 (joined) sprockets from the 11-28 (21,24,28 rather than the original 21,23,25). Its obvious it should work, I just didn't know if there was some kind of trademarked hyperglideshiftdoodlyperfectoshiftTM way the sprockets were machined for different cassette sizes that would cause a fit when shifting.....