In putting my bike on a diet, I don't want to reduce it's functionality in any noticeable way. For example, I'm not putting 21mm tires on it just to save weight So here's the plan so far...
- Crankset - (Done) - While not really done for weight savings reasons, I changed-out the factory Ultegra R8000 175mm cranks for 165mm cranks as an experiment with shorter cranks.
- Fork Tube - (Done) - Fork tube was cut shortly after buying the bike. I didn't want to poke my eye out!
- Handlebars - (Done) - I bought the bike used with 40cm Bontrager XXX Aero Handlebars, so I guess that weigh saving mod is "done" even though I probably wouldn't have done this mod if this bars weren't already on the bike.
- Seat - (Done) Stock seat is ~300g and while the quality is good, it just wasn't working for me despite all the padding. After trying several saddles, I've settled on a SQ Lab 612 Ergowave Carbon at 148g.
- Seat Post Mast - (Done) - Was able to swap the long 20mm offset seat post mast with the shorter version for a savings of ~10g.
- Brake Rotors - (Done) - Converted front and rear rotors from 160mm Ultegra center-lock rotor to 140mm XTR rotors which included removing the spacer on the rear of the bike to shave even more grams (front spacer must stay though.)
- Chain - (Done) - Per another thread here on WW, the Shimano XTR 12 speed chain will apparenlty work on my bike and is lighter than what came on the bike.
- Tubeless Valve Stems - (Done) - The previous owner had super long 70mm tubless valve stems on the bike for reasons I don't understand. I purchased 44mm Lindaret Titanium valve stems to drastically cut the valve stem length. As it turns out, the titanium stems don't really save any weight.
- Wheelset - (Done) - I love the Bontrager Aeolus Pro 3V wheelset that came on the bike and have repurposed them as my secondary, gravel-specific wheels. Current wheelset is a set of Light Bicycle WR50 custom build wheels with a "holeless rim" wheelset so I don't need rim tape to go tubeless and DT Swiss 240 hubs with the new EX36 freehub body which is lighter than previous models.
- Patch Kit / Tools - The tube, the Bontrager BITS multi-tool, and all the other stuff I have stored in the downtube is a bit hefty. I ditched the spare tube and CO2 for the Lezyne Pocket Drive ($30) mini pump which fits easily into the hole in the Domane downtube and is a quality pump for a pretty small price.
As an update, the photo below shows one of the main reason why I opted to start with a bike that prioritized comfort over weight. Not all the road I ride look like this, but a good portion of them do
Current state of the bike as of August 2020... Bike weights just under 18.5 lbs with pedals, bottle cages, tubeless setup and a few Blendr mounts. After having put over 1,750 miles on the bike so far this year, I've loved every ride. This is by far the best bike I've every owned, even if it's not the lightest.