The Spline Drive Spider for Outboard BB's is designed to improve your chain line.
It places the chainring over the bearing and cup itself, so that the chainline is closer to the centerline of the bicycle.
Machined from a thick plate of aluminium, the Spiders have a Heat Treated CrMo Steel insert pressed into them to mate with the splines on your Profile BB Spindle.
Four Arm (104bcd) and 5 arm (110bcd) versions are available now.
The Sinz 4 bolt chainrings do not fit our spiders. Profile, Sharp, Rennen, and Shimano 104bcd 4 arm chainrings all fit perfectly.