Yes to the tube flap
Hi David
Yes you will probably want to use tube flaps to protect the tube. Depending on how the tires were stored you may also have to open them up so that the mounting lip will slide on the rims. Will look for the thread where this was discussed. It's in the Hammond Barn Series.
The problem is if the tires have been stacked they may have closed down at the opening. One of the things I have done is to put the tubes in with the tire laying on the floor and just inflate until the tire opens up to about the width of the rim and let them sit for a day or two. Seems to save on wrestling match.
I've been running 11:00x20s non-directionals on my C60S for 27 years with out problems. The 12:00x20s should give you a little more rubber over drive.
Cheers Phil
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