Need some advice and preferences. I'm planning to design a CNC run of billet clamps to mount dirt forks on airheads. Ricky and I are working together on this and need three pair between us. I plan to offer some for sale to ADVriders as well. I'll solicit reservations when the design sorts out and costs are known. Time to explore some issues and make decisions. I'm partial to WP forks. We have two pair of 50mm Extremes, and two 43mm USD's. I know most folks would rather use 48's, so maybe there will be an easy way to use the same basic clamp to fit all three sizes. I'm pretty sure the hole centers are the same, assuming KTM axles (17, 20, 26mm) and wheels. The biggest question is whether to use an upper and lower spacer to spread the clamps. The mounting surfaces on the USD forks allow some variation, but not enough to work with the head on a BMW frame. An upper spacer will effectively lower the front end by dropping the head. A lower one will be fork length neutral. The spacers would be designed to rotate with the clamp and use BMW head bearings with no welding. A more radical alternative, which of course Ricky likes, is to redesign the steering head to use larger diameter stem and bigger bearings at the top and bottom. Essentially new bearing races would be welded to each end of the steering head. This approach would add rigidity (and stress to the frame) to the front end by spreading the bearing surfaces. Another possibility would be to use a BMW stem with no head modification. The triple would then angle down from the center at the lower, and maybe upward on top, to widen the spread and clamp in the correct area on the fork. I fear that this method will be too costly both in terms of material thickness and complex machine work. It is likely that the first method will be the simplest, but want to throw it out for discussion. Any ideas on how to best accommodate more than one hole size for different size fork tubes? The magnums are 50 top and bottom. The 43's are something like 57 and 55mm. I haven't measured the 48's but my guess is the larger hole is 60mm. That translates to a variation of about 5mm in wall thickness. Sounds manageable with spacers or different bores within the same shape. I'm planning to use anywhere from a 40 - 50mm offset on the clamps. This will assure that the resulting trail does not exceed stock figures for the R80. I'd like to bring it down to something in the 90-100mm range. I'll post some CAD drawings as the design comes along. What do you guys think?