Which rear tyre sizes for off road racing

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Bensien

Race Dog
Joined
Mar 16, 2010
Messages
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Location
Centurion
Bike
KTM 990 Adventure
I’m trying to make sense of the manufacturers’ recommendations. The Europeans seem to favour a 140/80 rear, but recommend anything from 120-140. The Yamaha WR450 comes fitted with a 110 and the 250 with a 120, The Honda 450X has a 110 rear tyre and the 250X a 100 or 120, depending on who you chose to believe. There doesn’t seem to be any correlation between bike and tyre size.

So my question is, if you could get your tyres for free, what rear size and compound would you choose for trail riding, enduros and rallies?
 
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