I've got one. You'd need a 112link chain when new. If your 110link chain is already a bit worn and stretched it might take the 47t sprocket (depends on how much play for the rearwheel adjustment is available)

Check this table: http://www.off-the-road.de/XT-660/We...ins-Sprockets/

For all the math: http://www.gearingcommander.com/

HJ

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Riding the Mad Mule !! ... no more... went orange...