Firstly a quick hello as this is my fist post. Ive been into mountain biking since it first became popular in the uk and had my fair share of bad bikes that were not up to the task before getting my first half decent kona and then later a zaskar LE (wish i kept that now) and im now looking to add a retro bike to my now very modern bike collection and was wondering if there are any that are best left alone if i plan to use it fairly regularly for light xc duties. Im not looking for a mint example as wouldn't want to spoil it wearing out super rare parts but don't want something terrible to look at and i don't want a garage ornament. Are there certain materials or assembly processes that have not stood up well to the test of time eg certain alloys work hardening or bonded tubes letting go etc. Is Ti better than steel and alloy? any advise is appreciated thanks.