wrcompositi wrote:Some alerting findings about FM066SL frames...
Recently I saw 2 instances of cracked seat tube of FM066 on Velobuild:http://www.velobuild.com/6-build-photos/5903-cracked-fm066-sl-after-2-rides
The 2 frames in question cracked in similar positions: behind the seat tube and about 12cm down the seat tube.
This seems to be an unusual location of failures, so I removed my seatpost to investigate, and guess what I found:
There's an abrupt transition from a smooth inner wall to a lower "gorge", and the thinner area starts about 11cm down the seat tube, coinciding with the aforementioned cases. My frame has only logged 700km and I 've seen no signs of cracks both inside and outside the seat tube so far, but I'm starting to worry my frame will crack the same way in the future.
My seatpost is cut to 260mm, with insertion depth of 105mm, maybe I should use a longer seatpost to lessen the possibility of cracking?
Has any FM066 user found the same issue of uneven wall thickness of seat tube?
I'm the guy who opened the topic on the FM066 cracked frame on Velobuild.
The topic has been deleted on velobuild, so, I hope you won't mind if I give my answer here.
For some reasons, there seems to be a fight between velobuild's moderator and some chinese vendors. I'm not here to blame anyone, let's just say frames like FM066, 98… are not sold there anymore, and every topic about those frames has been deleted by the moderator. Looks like censorship to me, but anyway…
So, yes my frame cracked, and yes, Mark from Honor Bikes did an excellent job, sending me promptly (and for free) the exact same new frame. He didn't even asked me to send my frame back, he only saw the pictures I took and solved my problem.
So, in my opinion, that's quite an excellent service. I have nothing to complain about. Problem solved, and thank you Mark for your work.
Here are a few pictures of my new freshly assembled frame : complete weight is 5.92kg.
And all the details :
Frame FM066 SL 56cm (UD Matte) 904g
Fork FM066 SL (steerer 215mm) 349g
Carbon spacers 4g
Headset (2 Neco bearings + cap + top cap carbon + aluminium bolt + expandeur ultrastar2) 82g
Front wheel by Topwheels (AMC Road 24 Tubeless + Alchemy ELF + CX-Ray) 522g
Rear wheel Topwheels (AMC Road 24 Tubeless + Alchemy ORC-UL + CX-Ray/Sprint) 683g
Crankset Hollowgram SiSL2 550g (with 50-34 FSA rings, spindle and all the spacers)
Roulements pédalier Cycling Ceramic BB30 45g
Front der Sram Red Black 70g
Rear der Sram Red Black 148g
Shifters Sram Red Black 302g
Cassette Sram Red Black OG 1090 11-23 155g
Brakes front/rear Zero Gravity Ti 196g
Bar Easton EC90 SLX3 44cm 208g
Stem Easton EA90 + Ti bolts 127g
SeatpostEaston EC90 (Ti bolts + M5 yokes J&L) 142g
Saddle Fizik Antares 00 140g
Chain KMC X10 SL 230g
Gear cables RIDE ON professional (NA)
Brake cables RIDE ON professional (NA)
Tape DSP Lizard Skin 2.5 60g
Water bottle cages Saso x2 30g (15g each)
Seatpost collar J&L 13g
Skewers X Lite Ti 68g
Pedals Speedplay CrMo with Ti spindle 164g
Front tire Atom Galactik 247g
Rear tire Atom Galactik 255g
Latex Notubes 40g (20g each)
Total (verified on a digital scale) : 5920g
It's a very nice ride, I love it. It's hard to tell, because this is actually my first road bike, but I really feel like the bike handles really well, is quite comfy and rigid enough.
Less than 6kg on the scale makes it a good climber, extremely responsive, with fast accelerations. I love it !