Hello
Looking at the Truvativ x0 2×10 crankset which appears to come with 2 crainring bolt circle options
I understand what ‘bolt circle’ means but could do with understanding why 2 options are available and what option I should be considering and why

Funnily, of all the sites I’ve looked at, ONLY ChainReaction seems to have that as a selection option

Thanks for any input
Andy

When I was looking at X9 setups, it seemed that you can’t get a very low geared 120BCD rings, 104 for the win! 😯
There maybe more technical reason, but that was the only one that mattered to me..
That and 104 chainrings are more common (cheaper)