Stroke rate - yeah sorry was skimming, thought you were talking about stroke count - i.e it took me 19 strokes to swim 25m, used to take me 22 strokes therefore I'm better.
wrong - which is faster and what can you maintain for the chosen length?
Bike strength is key, so many people spin away then hit a hill, run out of gears and fly off the back but still insist on whizzing around at 110rpm.
Strong legs means less fatigue on bike, means quick run. Try hill reps where you drop a gear each rep until you're doing around 50-55rpm then hold that for the remainder, 8 x 4min climb is a good session, can be done on the turbo but best on an actual hill - top and tail with 15 min warm up / cool down