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The answer is - "it depends"
Lower ke trainers (ie traditional ones) replicate lower ke situations (ie hill climbs)
Higher ke trainers better replicate the requirements of lower gradients/tt'ingSo if your goal was the quickest time up Alpe D'Huez then you might want to stick with a low ke trainer. But if you are looking to improve your performance on the flat then a higher ke trainer makes sense.
So, are we saying that doing longish threshold efforts on one of these gives greater gains than on a fluid trainer? Watts are watts, Shirly?