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               Originally Posted by 
              stoic bloke  
              hi ,yep you got it it's a 520 ''x''or''o''ring.
              
 mine had a regina x ring from new which wore out and had tight spots even though a scott oiler was used.though on one occasion the bike was washed with an very high pressure hose which may have forced water passed the x ring.the chain was really shagged at 5500mls.
 
 im sure you will check yours thoroughly, no point risking a breakdown
 
 bye
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         Although i don't have a Tenere (i have the pegaso with the same motor) mine came with Regina X ring 520\110 and after 15,000 km it has tight spots 
        
 although i use an oiler and i clean the chain from time to time, other with the same chain report the same.
         
        
 After some investigating on the net DID VM2 and AFAM XHR are getting good reviews