The reason to test fit the fork is so you know exactly where to cut the steerer tube. For most all bikes, it's best to use a minimum of 30mm of headset spacers to allow you to adjust the handlebar height on your bike.
Note that the top of the stem sits roughly 5mm above the top of the steerer tube, leaving enough contact area between the stem and steerer tube for a solid grip. It isn't recommended to have more then 5mm of gap between the top of the stem and the top of the steerer tub
It's important that the steerer tube is cut at least 5mm shorter than the top of the highest headset spacer
Your steerer tube needs to be long enough to account for your headtube length , plus the stack height of your headset, plust the height of your stem clamp, plus any spacers you plan on using, minus about 3mm. Putting spacers below the stem is optional. They allow you to raise the stem a littl
The instructions state that the compression gap between the top of the steerer tube and the top of the stem should be 2mm min and 3mm max (Talk about fine tolerences :shock: ). When I took the stock Giant stem off the gap is about 5m
It isn't recommended to have more then 5mm of gap between the top of the stem and the top of the steerer tube. Step 4 - Install the headset top cap, turning the preload bolt clockwise to tighten the headset, compressing the parts togethe
The reason to test fit the fork is so you know exactly where to cut the steerer tube. For most all bikes, it's best to use a minimum of 30mm of headset spacers to allow you to adjust the handlebar height on your bik
You should always leave some length of the steering tube above the stem and put a spacer above the stem so that the entire stem clamp is clamped around a cylinder of constant diameter. The extension above the stem clamp can be as little as 1mm.
NOTE: Headset spacers can be positioned both above and below the stem (for aesthetic reasons some riders prefer to have no spacers above), but it's important to use enough spacers so that the lip of the top spacer sits a little (1-2mm) above the top of the steerer tube so everything is compressed together when the SFN .
The steerer tube must not be so long as to protrude from the top of the stem , preventing the headset from being tightened, but also must be long enough to allow for enough clamping contact with the ste
31.8mm is normally the diameter of the handlebar clamp not the steerer tube. Most steerer tubes will be 1 and 1/8th of an inch or 28.6mm some are 1 and 1/4 of an inch or 31.75mm but much rarer. Just measure the inside diameter of your existing stem by taking off the top ca
The standard sizes are 1 inch, 1 1/8 inch, 1.25 inch and 1.5 inch steerers . You may occasionally come across a 1-inch threadless steerer, but you're more likely to find a threaded steerer in this size. 1 1/8 inch threaded steerers are, however, quite commo
The stem or spacers should be slightly above the top of the steerer tube ( approximately 3mm ). If they are flush with or below the steerer tube, headset adjustment will be impossible. Acquire additional or differently-sized spacers to reach the appropriate heigh