I have a Giant contend 2 2017, its been a great work horse but now it needs changing, I got an Ultegra groupset for cheaper than a 2nd hand Ultegra spec bike. I've started with swapping the crank over, but noticed a gap between the BB and crank arm on non drive side that wasn't there on the claris crank. I'm assuming I need spacers but none came with Ultegra crank.
What measurements do I need to take to know:
- crank is in right position to too far one side or other.
- what size spacers if needed and fitted which side,
Tried looking for build manual but so many different variants can't find what I need.