Hi When I measured the top clamp for ordering a set of HDB set for my Sm610 (2009) I found the sizes to be 86/50 bolt pattern. However I didnt see any such size on the HDB web site. Can any of you who has a SM610 pls clarify if my sizing is correct or not? Rajan
The 86mm is correct, but HDB only offers the 38/40mm to fit their lower clamps, or equivalent. The stock clamps are much deeper than normal as their method of offering forward placement of the bars. You can rotate the HDB clamps for a bit of forward placement also. So you will want to get both upper and lower clamps. Other model bikes and aftermarket clamps have bolt holes equi-distant to the bar centerline so ordering only a top clamp can make sense for them. The 86mm is very narrow and creates a slight challenge to fit an underbar mounted steering damper, but it is possible, I have a prototype HDB submount with modified lower clamps. The lower clamps have to have clearance machined into them on the approprate side for forward or rearward bar position. He is working on final versions. In the image below you can see the HDB lower clamps with an offset triple clamp bolt. More HDB pictures on my bike here for the curious
