I found the following articles that support weight training and cycling performance. This is from the Journal of Applied Physiology:
http://jap.physiology.org/cgi/conten...ract/65/5/2285
The conclusion is:"These data do not demonstrate any negative performance effects of adding heavy-resistance training to ongoing endurance-training regimens. They indicate that certain types of endurance performance, particularly those requiring
fast-twitch fiber recruitment, can be improved by strength-training supplementation