The cutting operation is one that needs to be done carefully. If you do not execute it properly you may have problems when mounting the stem and the upper cap of the headset.
Why is it needed to shorten the fork’s steerer?
Firstly you can do this when you buy a new fork. Others do it to lower the position of the handlebar but I do not recommend this as it will become much harder to sell the newly cut fork. Anyone who buys a second hand fork will appreciate a longer steerer especially due to the fact that then it will be easier to adapt it to the new bike.
How is this done?
You have two possibilities which are both as efficient. From our point of view using a special tool is recommended because of the precision and ease of use. Such a tool is priced between 10 and 50 euro depending on the producer or how the cutting is done (more or less simple, precise etc.). It is important that the tool is going to cut the steerer perfectly straight as otherwise you will face problems when putting the stem and tightening the upper cap. The second possibility is to use a hacksaw after fixing the fork but we do not recommend this as the result may not be as expected.
Step 1: in the image you can see the tool we will use to cut the steerer. Draw a clear sign on the steerer where you want to cut it. Consider the following: the length of the headtube, the height of the headset (if they are not on the interior of the headtube), the spacers (depending on how many you want to use) and the stem.
Step 2: Fix the tool where you drew the sign.
Step 3: With your left hand hold the tool; then with the other hand execute a rotation around the steerer. Ensure you are cutting it straight.
Step 4: Execute the rotation movement until the steerer is completely cut.
Step 5: Now you will have to finish the steerer. Use an abrasive brick as wide as possible (in the image there is a thin one. The process will take a long time with it.) File off the metal surplus that has remained after cutting.