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               Originally Posted by 
              jiauka  
              It would be ok, but it is a nonesense to carry a 21" tube on abike with both wheels being 17". 
              
 Get a tube for the front wheel (17" 120/70), you could use it on the rear wheel too.
 
 have fun,
 
 j.
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         Cheers dude. I think you missed my first post though, I do have a 17incher, I just don't know if it will work on the front as well as the back 
        
 
         
         
         
         
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               Originally Posted by 
              Denny  
              ...I've got a spare Metzeler, which was used in the rear, with the following text on the tyre...
              
 4.50, 5.10, 130/70, 120/80, 130/80, 110/90, 120/90 - 17
 
 Also, ME-F17M/C(B)
 
 Can this be used for front & rear, if not, what size inner tyre can be used for both on an XTX?
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