When it's time to replace/rebuild things in the BB, an ISIS BB means buying a new one. Mr. Whirlies use regular Shimano type external bottom bracket cups, so replacement parts are easy to find and cheap.
With Mr. Whirlies the granny ring is moved to the middle position without moving the crank. With other cranks your middle chainring is usually at least 30 teeth, which is a bit large for crawling.
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