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What’s the between between the various types?
Different thread diameters, broadly road ones are a bigger thread than MTB because the MTB axle has a thicker wall for extra strength. There are ebay sellers doing road spec ones in pretty colours, or at least there were when I got a black one for my 5700 cranks.
EDIT: I think you need M20 for 5700 cranks, but measure before ordering. If you include the thread size in search (M20, M18 or M15 depending on crank type) you'll find the right ones, they are out there in all the sizes.
gbj_tester
AlexD
grams
Hollow tech fixing / preload bolts:
What’s the between between the various types? For instance, why won’t the colourful anodised ones on eBay fit my 5750 cranks?