Finally got round to upgrading the Trek today.
Removed the "old" Tiagra shifters and RD (I say old, they've done less than 1000mi and are in near mint condition) and put on a set of R7000 shifters I had in a cupboard and the new R7000 rear derailleur. Took the 10sp cassette off the wheel and was glad I'd ordered the 11sp cassette which fits on a 10sp freehub (it's 11-34 so nice wide range for climbing hills, and it looks like I'll be lending it to my Dad fairly often and he's in his 70s so the extra range will be good for him too).
I'm leaving the Tiagra crankset and front derailleur in place - they are perfectly fine with the new 105 for now - ultimately I will upgrade them too and then I'll likely sell the complete Tiagra groupset to recover some costs.
New inner cables for the brakes and gears too - a good thing too as the old cables were showing signs of corrosion as the previous owner had kept it in a barn for two years. Only minor problem was the nipple for the right shifter got stuck and then the ratchet wouldn't engage for the upshift or downshift. Took a bit to get the cable out and then cycled the levers both directions a few times to get it to reset. Annoying as I'd already cinched the bolt at the derailleur and I had to undo it and pull the cable out, lesson learnt - check the action works beforehand.
Re-used the bar tape as it was in good condition, and although I have new bar tape ready to go on, I'll leave it for now.
Overall not too bad a setup - I'll have to check the indexing on a ride tomorrow to make sure it's ok, but seems to shift no problem so far.
Weight has dropped to 9.8kg including pedals and all the mounts etc on the bike, which for an alloy 62cm frame I'm very happy with. Crankset upgrade should drop another couple hundred grams and I've got new tires coming tomorrow which should be a couple hundred grams lighter too. Should offset the mudguards nicely when I get to put them on.
Removed the "old" Tiagra shifters and RD (I say old, they've done less than 1000mi and are in near mint condition) and put on a set of R7000 shifters I had in a cupboard and the new R7000 rear derailleur. Took the 10sp cassette off the wheel and was glad I'd ordered the 11sp cassette which fits on a 10sp freehub (it's 11-34 so nice wide range for climbing hills, and it looks like I'll be lending it to my Dad fairly often and he's in his 70s so the extra range will be good for him too).
I'm leaving the Tiagra crankset and front derailleur in place - they are perfectly fine with the new 105 for now - ultimately I will upgrade them too and then I'll likely sell the complete Tiagra groupset to recover some costs.
New inner cables for the brakes and gears too - a good thing too as the old cables were showing signs of corrosion as the previous owner had kept it in a barn for two years. Only minor problem was the nipple for the right shifter got stuck and then the ratchet wouldn't engage for the upshift or downshift. Took a bit to get the cable out and then cycled the levers both directions a few times to get it to reset. Annoying as I'd already cinched the bolt at the derailleur and I had to undo it and pull the cable out, lesson learnt - check the action works beforehand.
Re-used the bar tape as it was in good condition, and although I have new bar tape ready to go on, I'll leave it for now.
Overall not too bad a setup - I'll have to check the indexing on a ride tomorrow to make sure it's ok, but seems to shift no problem so far.
Weight has dropped to 9.8kg including pedals and all the mounts etc on the bike, which for an alloy 62cm frame I'm very happy with. Crankset upgrade should drop another couple hundred grams and I've got new tires coming tomorrow which should be a couple hundred grams lighter too. Should offset the mudguards nicely when I get to put them on.