T2 is just tri-speak for Transition number 2 (ie the place you get off the saddle and prepare for the run). When you try a run after a bike you'll understand why Fish is saying you'll be glad you practiced it before a race.
As for the rpm's, a higher rpm is generally more desirable, but there are exceptions. Ask yourself:
1. Are you generally strong or more of a lightweight? Your speed will be determined by the power you can exert on the pedals. Power is a function of strength (how hard you push on the pedals) and speed (your rpm's). If you are strong, you may feel more comfortable pushing hard with low rpms. If you are lacking strength (like me) you may do better at utilising the speed component of force. Of course, training your weaknesses is a good idea as well.
2. What is your current comfortable rpm? If you are currently turning the pedals at 60-80rpm, then a move to 100+ is a big jump. When you make such a big jump cyclists often lose the circular pattern of turning the pedals (ie it becomes choppy). Better to make changes in a progressive manner.
There is some thoughts amongst triathletes that a high turnover on the bike translates to a higher turnover (and therefore speed) on the run (the nervous system likes to fire at the same rate during this transition).
I've covered a few topics here. There are some other factors that might influence your cadence, but consider these first.
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"Maybe you're not as fast as the person in front of you, but certainly faster than the person who never started" - John Collins, creator of Ironman.
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