Now that I think about it, the only issues I had with using a mountain bike were the gears being a little low and widely spread, as my trainer doesn't have manually adjustable resistance.
I use neighbourhood pets and small children fed into the bladed spokes of the rear wheel to increase resistance levels to what I require.
I expect everything just gets drawn in by the raw power.
@hippy started
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Now that I think about it, the only issues I had with using a mountain bike were the gears being a little low and widely spread, as my trainer doesn't have manually adjustable resistance.