pulleys and belts - sizes

I've read that 5mm seems to be the preferred size for pulleys, is there any specific reason for this? Would 3mm (15mm wide) cause any problems as I cant seem to squeeze 5mm pulleys (20t &40t) into the space I have available while keeping the number of teeth engaged at a reasonable number.

Any thoughts?

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Originally Posted by mocha

I've read that 5mm seems to be the preferred size for pulleys, is there any specific reason for this?

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Mainly because there more common and cost effective.! . . . 3mm will be fine so long has the belt width and engaged teeth is kept.

Thanks jazz, 9 and 22 teeth engaged on the 20t and 40t pulleys... should be enough for Z??

Quote:

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Originally Posted by mocha

Thanks jazz, 9 and 22 teeth engaged on the 20t and 40t pulleys... should be enough for Z??

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Yep thats fine.!