Couple of questions as of late.

1. As a way of variety, are there any dumbbell exercises which can be substituted for pullups and chinups?

2. Because I'm doing a lot of mountain biking on account of it being summer here, I am training my legs for endurance, and I don't want to be sending mixed messages to my muscle in regards to this.
So should I not do any weights exercises of legs, or should I modify them? Currently I do squats and lunges.

Thanks!

I train for endurance (triathlons) and work out with weights as well. I am not aware of any conflict.

As for doing leg weight work for cyclists, if you do a search, half of all cycling coaches will say that weights serve a cyclist well, especially during the off season, and the other half of the coaches say any time spent in a gym is wasted because it is not spent on the bike.

Who to believe? Personally, I believe that if you are currently doing a lot of cyling, then you currently don't need to do any leg weight work, i.e., squats or lunges.

Yeh, the reason I ask is because it doesn't seem right to constantly double fatigue my legs with weights after cycling or vise versa.