CG; you’re going on about the TT on something like the RL being too short, yet your Ibis is actually a tiny bit shorter. 😕
???
I don’t understand what you really want here. As Mboy points out, the Sirius is quite heavy for 853, whereas the Lobster frame in 15″ is 4.25lb. Which is pretty bloody light for an 853 frame. It’s also fantastic value for money. Far less hyped than stuff like Cotic. You say the 14″ Inbred is too short, and the 16″ too long, so the Lobster would be perfect, as it sits in the middle.
The only downside to the Lobster is that it’s not an SS frame, but a tensioner works perfectly well, and you’ve still got the option of putting gears on. An Excentricker BB would do away with the need for a tensioner, as would something like a Phil Wood Eno eccentric hub.
You can adapt the fit of a bike far more by changing stems, using a layback seatpost, different width bars etc, than 1/2″ or so in the TT. Different width grips make a difference in the ‘feel’, even.
So, two frames you’ve had, which would’ve been perfect, you’ve sold.
I give up with you Love. You’re impossible. 🙄
X