Join Date: May 2010
Location: Madison, Wisconsin
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I bought a new-old-stock pair of clincher 20s once for like $10. Terrible idea. They were ok on glass smooth roads, but other than that they were awful.
The OP mentioned tricks. If that's the case, get the widest tire (within reason) you can fit in your frame. I would definitely not recommend tricks on a 20 or 23 tire. I'd want something at least in the 32-35 range. IMO 28s are good for all around use.
Any of the tire sizes I mentioned should fit fine on the rims mentioned in the OP.