I'm a new member here but have been reading along for a while now. I figured it'd be okay if I asked you about a problem I am trying to solve at the moment.
I do not know if it is placed correctly here in "frame building", but I thought the audience of this subforum might be appropriate- in any case, please move this thread if it does not belong here and sorry if so.
So let's get straight to it:
I want to have a rear disc brake on a new school aluminum track-style frame that is rather beefy and very stiff. I would appreciate if we do not get into the whole
"why would you wanna do such a stupid thing" discussion, but rather focus on the physics and the engineering involved in finding a solution that has the most advantages.
I want to have disc brakes and I will do it. And I love doing it for the hell of it. haha
So anyway, like I said, it is a track style frame, yet it has a mount for a rear road caliper brake in the short tube between the seatstays just above the tire. It also has track ends, sometimes called "horizontal dropouts" (yes, it has 120mm rear spacing, too). I have been thinking a lot about the optimal solution for the problem and I have so far come up with a couple of concepts.
I figured I'd share the three of them with you that seem to be the most diverse in design so we have different approaches to get started.
the first design seems to be the heaviest, the second could be lighter and the third is probably the lightest. I do not want to alter the frame, so welding or drilling is not an option.
the dimensions and proportions in these drawings are not meant to be absolutely correct.
here they are, I hope my explanations are not too messed up
I'd really appreciate any advice, thoughts or ideas from you! Thanks a lot in advance,
all the best