My rear wheel's overall tension droped and needed retruing after 3 weeks of riding. The mechanic claimed that it was because I was too heavy plus the fact that I have two D locks installed on the bike. First of all is it true that 100kg-110kg weight on a low range new road bike is too much? The mechanic then suggested i take one D lock off the bike and put it in my backpack instead. That would mean less wieght on the frame but I would have to carry it so I would be exerting more force downwards so no net decrease in tension in the wheel. Correct?