Location of Key Spoke
Black Crow Carbon rims are all left hand drilled. This means when the valve is at the top of the wheel, the spoke to the left of the valve hole goes to hub flange closest to you. The spoke to the right of the valve hole goes to the hub flange on the far side of the hub.
Spoke holes are drilled at an angle to provide a stable interface between the nipple head and the rim’s spoke bed. It is important that the spokes are laced to the correct holes to match the spoke hole angle.
When building a wheel, the first trailing spoke from the hub (the key spoke) will go to the 2nd hole to the right of the valve hole as seen here:
Since The XCO is an asymmetric rim the front and rear are laced differently.
Rear: The longer side of the rim (distance from rim lip to spokes) goes to the drive side.
Front: The longer side of the rim goes to the non-drive side (brake side)
For an excellent resource on wheelbuilding which explains the spoke lacing process, see Sheldon Brown’s website.
Measuring Spoke Length
The ERD (effective rim diameter) figure which we publish is for the plain brass DT Swiss nipples as provided in each rim.
If you plan to use different nipples we recommend measuring the ERD yourself with the nipples you plan to use.
Park Tool has a simple method outlined here.
Recommended spoke tension for The Enduro and The XCO is 120-130kgf (max).