Hi,
I intend to get a custom frame built, based on my own geometry. I don't have any experience designing frames so I am interested in feedback from the experts here (I hope this is an appropriate sub-forum, as I suppose you guys know the best what to look out for). It's meant to be an allrounder (for I guess my definition of it :-)); I intend to use it for street trials, dirt jumping, single tracks, and a bit of touring. I modeled it after a Spank Alfonso (medium size) frame, which I currently have and love. It basically fits the bill and everything I want to do on it I can (with varying degrees of success, probably mostly limited by my own inabilities, though). But it's an old frame, it's difficult to find proper dropper posts (weird seat tube diameter), it's non-boost, no thru-axle, front-center is a bit too short (my toes touch the front tire occasionally), I'd rather it had a slightly lower top tube (i.e., lower stand over height), it has no tapered steerer, I'd *think* it's probably pretty heavy (as it's pretty beefy). Anyway, the build is going to be titanium. I've attached a model I've created with relevant measurements (in millimeters). Also happy to upload the model of the Spank frame I used as a baseline if that would be of interest.



As I said, I am curious to hear general comments & concerns. On top of that, I'd love recommendations on tube diameters and thickness to use (I have not yet inquired about certain details with the builder). Basically, I want to make sure that this thing can take *anything* I may or may not throw at it (I don't intend to ever buy another frame, if you will): falls, heavy cases, anything. Are double/triple butted titanium tubes a thing? I'd guess that the most common fracture zone on a jump frame is probably the head-tube down-tube connection (if you case heavily). On the Spank Alfonso this piece is beefed up like crazy (I've never been worried about it there). How could that area be strengthened on a titanium frame? What should I ask for? (the builder is a professional) Any other areas to watch out for? Any feedback is appreciated.

The model already includes a dropper post (I used it for measurements) and has a sketch of stem and handlebar. Feel free to ignore those details. Some numbers may change slightly (e.g., it's not quite clear at this point if the chainstay can accommodate my tires and that obviously depends on tube diameter and other factors, but if anything changes should be minor and with chainstay specifically not affect the majority of the geometry).