Well the project is at the begining.
The frame is a 1992 Trek 8900. I has carbon tubes boned into alloy bits. I have weighed the frame at 1737g with steel m5 nuts on the water bottle cage studs and the seat collar which is an odd size so I can't change it. I have on there way Ti canti bosses and have fitted alloy M5 nuts in place of the steel ones. The seat Q/R has been replaced by am M8 steel bolt saving 28g.
The build spec will be
PMP 26.8 TI post with coke can shim 191g
Sella Italia SLR XP saddle -185g I hope it survives XC riding.
Ti stem - have not sourced yet - eyeing a few 130g
Ti flat bars have not bought yet but eying a few -150g
No name cantilever brakes 344g with alloy mounting bolts and shimano link wire. I am on the hunt for lighter pad holder and the stud holders Ti again. SRP did some.
Rear wheel 28H X517 rim M950 hub sapim race spokes and alloy nipples -870g
Front wheel 28H X517 rim M950 front hub sapim race spoke and alloy nipples 690g
Conti X-king supersonic tyres 811g
Michelin Latex tubes 251g
Rim tape 24g
KMC 8-93 chain
Shimano M730 chainset with middleburn rings 24/34/46 170mm and alloy bolts 672g
Ti crank bolts 17g
Shimano M730 BB -320g but I have my eye on a Ti BB which is 170g.
XTR M950 medium cage rear mech 200g with alloy pivot bolt and alloy barrel adjuster
XTR M950 front mech 34.9 top pull 108g with alloy mounting bolt.
Cable stop 11g
Pace RC31 fork -777g I might be able to cut the steerer a bit and I have Ti canti bosses which will save some more weight.
Token headset 1 1/8" 117g with alloy top bolt
headset spacer will be carbon and I will use 10mm perhaps.
XT M737 shifters/brake levers 381g
Shiman0 HG50 12-25T casette with alloy lockring 304g but I want a cycledynamics Ti cassette.
Ti bottle cages -56g
XT M780 pedal 340g
Cables I have not weighed yet. Might go for Nokon but I will probably stick with standard transfil with jagwire alloy ferrules.
I expect the weight of the build to be 9.3-9.4kg but I get the Ti BB it will be less. I would be nice to get the build down to less than 9 kg but I might struggle there as I want to keep it a bit retro but weight weenie.
I have all the parts apart from the bars stem and canti bosses and I am still looking for Ti pad holders and stud holds.