Yea pears can get pretty tall, they are an indererminate. Last year I had my tallest tomato ever. A sun gold it got over 15' tall and it was in a POT. Had it attached to the deck with an 8' stake to begin with then had to add 2 extentions before a strong storm knocked it down. Planted another sungold there this year with a stronger stake and its already taller than I am :)

Yellow Pear will be one of the tallest growing plants (10+') and it will also send out a prolific networking of lateral branches that make any support system chalanging. Red pear doesn't seem to grow as tall but will still grow well over 6'.

I always had severe fruit cracking problems with yellow pear until I started growing it in a high tunnel. Now I find that it is one of most productive, although lacking in taste IMO, varieties that I grow. A few plants provide an abundant supply of fruit throughout the season if well cared for.