It defo shouldn't be too small, you have to load the wheel in at an angle, it is really really tough to pull the wheel in, must make sure all cable are in right place and in there recesses push the springs completely in on wheel housing and load the wheel in at an angle, it won't go in square, never in a month of Sundays. You have to get at an angle the bottom edge of wheel in housing and use leverage to pull wheel in. It is really hard to load but should go in. All I can say is if not loaded correctly it will seem 1cm-2cm too short, it requires high tension.