This Middleburn spider is compatible with the Middleburn RO1 Square Taper cranks which require a double chainring set up with a 110 BCD outer and 58 BCD inner.
Middleburn 5 arm 110 and 58 BCD are machined from 7075 T6 aluminium for maximum strength.
The chain line is a standard road of 44mm between the outer and inner chainring as standard.
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