Well i was bored and thought this might be useful to some of you folks. Just a list of all the mod rims and mod tire weights(rear). However i couldnt find the weights for the Zhi and V!z rims, or the luna tire.
All listed from heaviest to lightest.
Rear Mod Rims
Arrow Racing - 19.36 oz
Echo '07 - 18.69 oz
Revell - 18.55 oz
Kris Holm - 18.41 oz
Onza Ronnie - 18.34 oz
Onza Hog - 17.91 oz
Try-all - 17.60 oz
Echo '06 - 16.79 oz
Monty- 15.73 oz
Monty 221 TI - 15.06 oz
Rear Mod Tires
Echo Supa Trial rear - 40.31 oz
Tryall Stiky rear - 39.25 oz
Monty Eagle Claw rear - 38.80 oz
Maxxis Creepy Crawler rear - 36.75 oz
I dont know much about titanium, so anyone here with any real knowlage, correct me. But my understanding would be if you made two identical rims, same weight, one aluminum one titanium the titanium one however would have a higher tensile strength, it wouldnt be as stiff as the aluminum, so you would get a lot of flex causing nipples to loosen, spokes to break, maybe bending in the hub flanges. however i may be wrong.
Dan Heaton has had Ti frames…I think he has one on his muni now and he had one on his trials uni that he rode in U2 I think then Zack Baldwin got it and rode it in Defect and now Isaac LeMasters has it.
Oh and I am pretty sure Miyata sells freestyle unis with Ti frames.
Welding titanium requires quite a rage of specialized tools, even more so than to weld steel or aluminum, And certainly more skill. Your best bet would be to find some titanium tubing for your legs and seat tube, and rig up a crown to secure them together out of a material you can better deal with than titanium.
A good source for general information on steel, aluminum, titanium and carbon fiber, check out this page on sheldonbrown.comHere. On a side note, titanium costs a f*ck load.