My husband received a 26" Men's Safari from his job. (brand new) After riding it for less than an hour the left crank arm fell off. The nut holding it in place was stripped. (He brought it back home) Upon inspection the left crank arm would not fit fully on the axle. (When I looked on the inside I could see irregular groves. Here is a picture of the section of the crank arm that has the groves; sorry groves cannot be seen in photo.)
We called the company and after shipping us the wrong part, twice, they sent us another new bike.
Here is a picture of the "new" new bike's problem area:
There is a noticeable gap (~1/2") between the left crank arm and the bottom bracket.
Is this a defect in manufacturing/design error or just the way some bikes are? My fear is that if he rides the bike the same problem will reoccur.