Too short and the stem will not have enough clamping surface area on the steerer, making for a very dangerous situation. Always measure the steerer tube length of any used fork to be positive that it is long enough to fit your bike. If purchasing a used fork, you'll need to make sure that the steerer tube hasn't been cut too short by the previous owner, making it perfect for their bike but too short for yours. A new fork will come with a steerer tube that will be too long, meaning that you'll have to cut it shorter once you know the length that you require.
An integrated headset, with its headset bearings set into the cups that are hidden within the bike's head tube, will feature a lower stack height, while a standard headset with external bearings will take up more length. The phrase "stack height" often refers to the total steerer tube length that is taken up by a headset, although it can also refer to the same thing in a stem.If the bike or fork is new you may want to leave extra steerer tube length for more spacers than usual, allowing you to adjust the bar height and fine tune your position. Make sure to factor in how many spacers are required to achieve the desired bar height. While this Tech Tuesday shows you how determine the correct steerer tube length, it doesn't take into account your preferred handlebar height position.This passes through your bike's head tube, along with all of the headset parts, and the stem is clamped in place at the top end. The steerer tube, in this case a tapered version on a Magura Thor fork, is highlighted above in red.
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