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Old 10-05-2012, 06:20 AM   #22
adventure950
Anglo-Saxon
 
Joined: Sep 2005
Location: Northumberland UK
Oddometer: 506
Hi Prutser, when I did the calculations regarding the driveshaft length and the amount of travel tha Maximum on a 100mm extension was theoretically 260mm doing ( a rough bit of working out 244 at 50mm extension) really would be the maximum travel so to achieve 248 you need to be carefull your not pushing two areas too far. Firstly the uj will be running very tight at those angles, and even though these are extremes if the shaft is revolving at any speed the wear and stress on the joint will be very high. Also the internal dimensions of the shaft tube mixed up with the offset pivot between the uj and the swing arm pivot mean the more extreme the angle the closer the shaft gets to the edge of the internal area of the tube which in turn puts pressure on the UJ and swing arm pivots. This clearance I believe runs out before the above measurements. Which would indicate your drive shaft could well be rubbing on the internal metal of the tube. Both these factors are part of the reason why HPN run a maximum of 240 travel on a 100mm extension and take into account they also machine the internal area of the tube as well as machine part of the the bevel box cup end of the shaft to lighten and reduce the diameter of the shaft which may give them a slight advantage over the standard sizes. I wanted to go a bit safer again and so reduced that travel to 234mm travel in real terms but doubt it would ever get beyond 230. I am not being critical here at all just hope you are aware of the problems that may be encountered and ( i hope are not a problem for you) if your informed you can prevent a failure of the components or damage to your bike or even worse yourself. Jake.
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