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RO1. I enquired and got this response if it’s helpful to you :
‘All Middleburn spiders fit all our cranks but to get the correct chain line you should use the correct type for those cranks. RO1 spiders are for RO1 cranks and will give a certain size chain line whereas those cranks you have look like RS7 so you need the SP-SQ model spiders. Are you looking for a 110 bcd spider to run a certain chain ring on your bike?’
RO1 works well for me.And with Sqaure taper it was just a change in BB length to adjust chain line.
tom-g
@mustard
Which Middleburn spider did you get, the RO1 or RO2? I keep meaning to get mine useable with road rings.