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@user87446
Glad your interested, this is a neat conversion. As far as I can tell looking at a 11 tooth cog, there might be a problem getting it to work. There may not be enough room for the snap ring to be mounted. I had to open up the 12 t cog with a dremel type tool, and on the 11 t there probably isn't enough metal to grind away without getting into the teeth. But you could try designing a different way for the cogs to stay on the cassette body. Your 12-15-19 would work well as far as shifting. I have a smaller 42 on the front along with a 52. I very seldom use the 42, so it's a manual shift. I don't think it is worth to try and fit a front derailleur, plus the added weight, fold issues and busy like clutter. If you're currently using a 19 t with the titanium triangle you shouldn't have a problem fitting the triple. Actually the 19 will fit closer to the spokes (eliminated plastic spoke disk), so there is more clearance from the stay. Good luck, let me know how it works out. My 12-15-17 works flawless and is easy and quiet to shift.