Please help. I am in a quandry. I want to suprise my dad with a recumbent trike. He has a very bad arthritic knee and probably weighs about 325 pounds. The two that I am looking at for him is are the EZ-3 SX and the EZ-3 USX. The portability isn't a big factor. He'll ride it around his house. For an older person with a bad knee, which would be better?
Thanks.