Help. Trying to find an article

Hoping someone can help me. The P.E. teacher at the school I teach at has asked me to give a short talk to her Year 11 pupils. She is teaching how to get 'race ready' , and has taught the pupils about training and the psychological aspects of preparing to race, this is for all sports, not just cycling.
The topic she has moved on to now is equipment and what advantage can be gained by using the correct, or the best suited equipment. She sees me scooting around on my road bike in lycra, and wrongly assumes that I am an expert. Despite my protests she persuaded me to bring my bike to school and give a talk. I know enough to realize that this topic is a can of worms but I have looked everywhere for a simple article giving approximate percentage gains for various equipment, eg aero bars, skinsuit, shoe covers, aero helmet. if anyone can point me in the right direction I would be very grateful.
The topic she has moved on to now is equipment and what advantage can be gained by using the correct, or the best suited equipment. She sees me scooting around on my road bike in lycra, and wrongly assumes that I am an expert. Despite my protests she persuaded me to bring my bike to school and give a talk. I know enough to realize that this topic is a can of worms but I have looked everywhere for a simple article giving approximate percentage gains for various equipment, eg aero bars, skinsuit, shoe covers, aero helmet. if anyone can point me in the right direction I would be very grateful.
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Posts
Here's a couple to get you started...
http://cyclingtips.com.au/2010/04/biggest-bang-for-your-buck-in-time-trial-equipment/
http://www.bikeradar.com/road/gear/article/how-aero-is-aero-19273/
or there is this on aero stuff..... a reasonable article.
http://www.active.com/cycling/articles/ ... t-benefits
tbh if you can, I d stick with RR, they may have heard of tdf, Cav and Wiggins/Froome but possible not the BBAR, S46 (SC) first rider off at 0800.