I bought my bike about 1 1/2 years ago. At the time, I had a shed in which to store it. I´m now in an apartment and it is stored in my parents´ garage about 2 1/2 hours away from where I live. I´d like to get it closer so I can actually ride it. I´ve been told I could get a front disc brake lock. I have found one but I want to be sure it will fit before I purchase it. How can I find out how thick the front disc brake is without standing next to it and measuring?