Boost Road/Gravel Bikepacking Frames.

[Tijoe]

Has anyone ran across a Bikepacking frame that falls into the latest frame configuration of what is being called a "Boost Gravel" frame?    Closest frame geometry would be similar to a Cutthroat.     I had a Custom Waltly TI 1 X 12 frame fabricated over a year ago, and it is perfect for my bike camping trips, but now I want to build up a higher speed, lighter weight, rig that is a true "bikepacker"   Lower BB height, shorter wheelbase, less slack HT angle.  A full size frame triangle that lets one put in a larger frame bag, boost rear width, fits 29 X 2.3 tires, frame geometry matched to fit a 100mm travel suspension fork.   Plus has provisions for a rear rack, and numerous mounts for cages on the frame.
If I go for another custom TI frame, I will have sliders put in the back.  If I can find a Chiner Frame with these features, (in carbon) then I would prefer to purchase a production frame.

Thanks.

[repoman]

I think you are getting geos mixed up a bit?
Bikepacking bikes (like the Cutthroat) typically have fairly long wheelbases, slack front end geo, and higher BBs than a typical gravel bike.

[Tijoe]

I think you are getting geos mixed up a bit?
Bikepacking bikes (like the Cutthroat) typically have fairly long wheelbases, slack front end geo, and higher BBs than a typical gravel bike.

Not if you are approaching the problem from a hardtail boost mtb frame perspective. Many bikepacking rigs are being built these days using boost hardtail frames with small triangles that wont fit a decent size frame bag.  The Cutthroat is one of the few that bridges the gap between gravel bikes and mtb hardtail frame geometries.   
Many 29er hardtails have a BB-drop of 45 to about 60mm.  Most gravel bikes have a BB drop of 60 to 75mm.     Thus, from my perspective, a frame with  lower BB height

[jonathanf2]

Why not just get a Cutthroat? REI has full bike builds on sale right now.

[Tijoe]

Why not just get a Cutthroat? REI has full bike builds on sale right now.

I build all of my own bikes.  I haven't purchased an assembled bike in over 30 years.

The 56cm Cutthroat frame weights over 1.5kgs, with a retail frame price over $2500, ($2K street price.) 
The whole point of the exercise is to find an aliexpress/Chinese manufacturer that sells the equivalent frame for an equitable price.

In comparison my Seraph Gravel frame weighs in just around 1000 grams, with a fork that weights under 400 grams, and cost $500.  I have ridden this bike hard and it has performed excellent over the past 5 years.   Therefore in a carbon frame, equivalent to the Cutthroat's frame geometry, I would expect a frame that weighs at most 1200 grams, with around a 500 gram fork, and cost no more than around $1200 USD.   

I can layout my own frame geometry give the specs to Waltly, and pay less than 1/2 the Cutthroat frame price.  (Lilely there will be a weight penalty for the add-ons I want to add to the frame versus an engineered boost gravel frame.)

Cutthroats are the most popular on the TD race, followed by custom frames. 

[Machine]

I too have been looking for this. Haven’t found anything yet. I’m surprised no one has copied the cutthroat yet. I guess too niche.

[Tijoe]

I found a 29er hardtail with very similar geometry to the Cutthroat.   Except...    It does not have boost 148mm rear hub compatibility. (it uses a 142 rear hub), and its weight is a bit too heavy for what I am looking for.

It is the Trifox bike MFM200.  A frame design from 2019/2020 timeframe.

https://www.trifoxbike.com/carbon-mtb-hardtail-frame-mfm200?srsltid=AfmBOoowJJx-uqFd8q1AGPMPs1wGULA7vA2HBrsOCRINZXqp5aUcM_aS

I wrote them and they have no interest in updating this frame to fit a 148mm rear hub.  It appears they are still trying to sell off this older production run.
(Their 2 other newer hardtail offerings are a lot longer wheelbase frame, but these frames are in the 1000g or less weight range.)