A little different slant to an existing thread, but when is the best time to replace both forward and rear tires? I have over 10K miles on my bike, and am showing interior tread to the wear bars on the rear tire, but so far tread looks good on the front ones. Should I go for 12K on the rear one? Do you generally replace all 3 tires at once or wait for front tires to display greater wear? The forum always gives good advice!