Thank you for your report Amuro. I also experienced the crack on the tube and got parts from Mayhem then replaced it by myself (but new crack starting to appear...now it's about 5mm length.)
My case.
I found a hairline crack one day and it became bigger and bigger. I continued riding, the rear tube quick release clip snapped and whole thing got wobbly. Angle of the saddle and everything gone wrong. Please see below animation GIF I made. (I guess
quick release was unclipped by my trousers then rear metal tube couldn't take the load with having the hairline crack, so the pipe started to tear and the crack opened, then a single screw of quick release was snapped by the force.
Since the rear upper tube is held by two button catches, my A-bike was somewhat ridable for a while even though it was very unstable --- so I could ride up to nearby pavement to save myself from cars. However, I saw reasonable numbers of reports on the crack on the net and thought there is a possible risk of fatal accident if users don't replace the cracked rear tube for long time.
(img. hairline crack on my A-bike)
(img. right after the incident. The opening of the crack was much bigger, but I pushed it back a little when I took this photo.)
Thank you for your report Amuro. I also experienced the crack on the tube and got parts from Mayhem then replaced it by myself (but new crack starting to appear...now it's about 5mm length.)
My case.
I found a hairline crack one day and it became bigger and bigger. I continued riding, the rear tube quick release clip snapped and whole thing got wobbly. Angle of the saddle and everything gone wrong. Please see below animation GIF I made. (I guess [color=red]quick release was unclipped by my trousers[/color] then rear metal tube couldn't take the load with having the hairline crack, so the pipe started to tear and the crack opened, then a single screw of quick release was snapped by the force.
[img]http://www.isseiyoshida.net/abike/forum/rearframebreak/00anime.gif[/img]
Since the rear upper tube is held by two button catches, my A-bike was somewhat ridable for a while even though it was very unstable --- so I could ride up to nearby pavement to save myself from cars. However, I saw reasonable numbers of reports on the crack on the net and thought there is a possible risk of fatal accident if users don't replace the cracked rear tube for long time.
(img. hairline crack on my A-bike)
[img]http://www.isseiyoshida.net/abike/forum/rearframebreak/crack.jpg[/img]
(img. right after the incident. The opening of the crack was much bigger, but I pushed it back a little when I took this photo.)
[img]http://www.isseiyoshida.net/abike/forum/rearframebreak/gone.jpg[/img]