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9 speed in rear has become my go-to. All my bikes are 9 speed Shimano.
>MTB and road interchangeability stops at 9 speed
>New parts are cheap
>Saturation of used parts
>Variety of parts (MTB and road and the ability to mix them into whatever you want)
>It's deemed too noobish so nicer old parts go on sale for cheap
>Durable shit dawg