I thought some of the ridemonkey gowers would like this a bit of mtb history on a new school bmx bike. This bike weights 18.8 pounds with brakes ti spokes and a slew of ti bolts. The profile sprocket was cut out to match the spline for the spider on the xtr cranks. The bb was a modified xtr spindal with a mid 22mm bearings with two shims for chain line. Its sweet light and stiff.