Originally Posted by
Road Fan
Amazing, especially for three days + design!
I got a question if you don't mind: When one makes an Hellenic seatstay attachment, does one leave that TT butt at the seat tube long enough to link in the seatstays where the TT has more meat and greater strength? Seems to me nearly all the rider mass plus the shock load from rear wheel road shocks is going right into that poor little 0.4 mm tube section (depending on the tubeset and alloy of course). We know darn well these deigns have been done and with success, so I'm not suggesting it isn't feasible. But how is it normally done, or in your opinion, how should it be done??
The visible geometry certainly suggests the short length of TT opens up another degree of flex freedom compared to the grand conjunction of TT, ST, and seatstays. But it it really more flexy?
3 days?
Here's my
Flickr album for this build. First pic is July 17, 2016 showing the start of drawing it up, last one with me holding finished frame and fork is November 13 same year.
To be honest, I didn't give the Hellenic stays a lot of structural analysis, just knew that there are many examples from the past and present. I have a Jo Routens that attaches directly to the seat stays.
But it has 120mm dropout spacing, whereas the Hunquarohloff is 135. That splays the rear out wider, and [MENTION=543270]BoltBreaker[/MENTION] didn't want the chainstays bent, so I came up with the spacer idea.
Seeing as you did the potential for additional forces on a thin tube, I made a custom seat lug to reinforce the area.
How should it be done? Dunno, this was just my solution. YMMV.