Seen a lot of hate around the web about Tantan.
From my experience it is not justified.
I will do a cut & paste of what i've written else where then make more comments...
I have a TT X1 that I purchased through the help of SissyPants.
Ordering, delivery went smooth.
1st build... also smooth.
I like the bike. It has helped me get several KOMs including one that I took from a TDF rider by 12s over 1/2 mile. I even got a climbing KOM (albeit a not very popular one) & I am a sprinter (at anywhere from 165 to 195lbs depending on time of year).
It is fast. It's on ICAN 55m tubeless 25mm GP5000s. 105.
I don't have a "real" bike to compare it to. I went form a Trek Hybrid to an entry level Giant a size too big, to this.
My only complaints are
1 - Seat tube (didn't see that coming did you?) - Fix = Plastic Shim Stock .015"
2 - Not as stiff as I was hoping. I burned holes in the sidewalls of my 28mm GPs from hills & sprints. This also wore the paint away in the chain stays & even started cutting into the carbon itself... Hence the 25s now.
Other than that I dig it. I am now looking to build an aero disk with SRAM AXS. I like the looks of Seraph & Sissy is cool to work with.
I am not sure I am going this route though as this will likely be my last build & my "forever" bike (unless I get a Time Trial). I need it to be stiff. I want KOMs & I want to be able to ride a century a few times a year.
ok then.
that all still applies. maybe the company has changed, but i have had a very prompt email exchange with them in the last few days. the ONLY reason i am considering a different company is due to the stiffness factor. but i have strong legs & i'm heavy for a cyclist (165-195ishlbs depending). I can deadlift over 400lbs for reps. I don't squat often because of mobility issues from an accident... but using a specific squatting machine at my gym I can squat 460 (loaded w/olympic plates). so the flex issue may not be entirely their fault.
the bike has been in 1 major crash & 1 minor crash. still ticking, no damage what so ever (that i've observed). it has done 55mph descents & has me in the 50% timewise on one of the local steep climbs.... 3.2 miles, 7.2% avg gradient, 1221 vert ft.
it sucks on gravel but is a dream elsewhere.
the bottom bracket developed a squeek/creak & I was using a wheels mfg BB I couldn't get it worked out myself so I took it to guy & he put a bunch of goop in it & got it quiet.