Hello people.
 We are looking to implement some  bike parking on campus but we just got the news that we  won't be able to have the inverted U on stainless steel so we are looking for any insides on what kinf of material doesn't require a lot of maintance and can resist a lot of heavy use, the idea is to keep the inverted U's since are the once that we consider more reliable on securing the bikes.
Any thoughts? Experiences?

Saludos!
Raquel Treviño
-TigreBici