Thus , like other security equipment , bicycle locks must balance the competing interests of security , portability , and cost .
Locking devices vary in size and security , the most secure tending to be the largest , heaviest and least portable .
Like other security equipment , bicycle locks must balance the competing interests of security , portability , and cost .
Locking devices vary in size and security , the most secure tending to be the largest , heaviest and least portable .