Bart de Jong
Can a spline drive sprocket/spider work on a crank arm with a spider boss? Yes, it can. If using a crank arm with a sprocket bolt boss, the boss will sit flush against the sprocket/spider. Just make sure you take out the spider bolt. With Profile spline drive sprockets/spiders, you can also match up (or “time”) the crank’s spider boss with recesses in the sprocket. Basically, the sprocket bolt boss will sit inside the cut out of the sprocket. 
The Middenberm dirt spot in The Hague is hidden in the bush. On Saturday 23 June riders were invited to come over for a jam. Some sponsors were gathered so there was some prize money to give out at the end of the day and Monster Energy once again took care of the drinks and the BBQ. Catfish was flown in to commentate and Bob Manchester was brought over to join the session. It was windy, very windy, but with the trees around the jumps, the wind wasn't a factor. The weather was actually just right which gave the riders the opportunity to ride all day long. The main builders at "The Berm" are mtb riders, or 26" or however you call them, and during the jam the two just blended together. It was bikes doing runs and when it came down to the last set, the crowd enjoyed the stunts. Up on top the line started off with some rollers, a small double, a spine style jump followed by two sets into a hipped speed jump, double and straight into a down hill set-up jump of 8 meters. That's where it got tricky because the last set
After doing a BMX 'zine for ten years (1987 - 1996) FATBMX made it on the internet. The year was 1998. Here to stay.