Raising handlebars is usually a matter of loosening bolts, sliding the stem up, and tightening again

Most handlebars sit on a stem—the metal tube that connects them to your fork. To raise them, you loosen the bolts that clamp the stem to the fork, slide the stem upward along the fork's steerer tube, and tighten the bolts again. The whole job takes five to ten minutes and requires only an Allen wrench or two. You do not need to remove the handlebars or fork.

How far you can raise them depends on how much spacer stack is already above the stem. Spacers are thin rings that sit on the steerer tube. If there are spacers below the stem, you can move some above it to gain height. If the stem is already at the top of the spacer stack, you have reached the limit and cannot go higher without replacing the stem itself.

Before you start, check what type of stem you have. Most modern bikes use a threadless stem (also called an ahead stem), which is the easiest to adjust. Older bikes sometimes have a threaded stem, which requires a different approach and is less common on bikes made after the 1990s.

Key Takeaways

  • Loosen the four bolts on the front of the stem (the clamp bolts), then slide the stem up the steerer tube and tighten them again to raise threadless handlebars.
  • You can only raise handlebars as high as the spacer stack allows; if spacers sit below the stem, move some above it to gain more height.
  • If the stem is already at the top of the spacers and you need it higher, you will need to replace the stem with a longer one or use a different angle.
  • Tighten the bolts evenly in a cross pattern (like tightening a car wheel) so the stem clamps straight and does not twist.
  • If your bike has a threaded stem (rare on modern bikes), you will need to loosen a top cap bolt instead and may need a headset wrench.

What you need to raise threadless handlebars

You need an Allen wrench (also called a hex key) that fits the bolts on your stem. Most stems use 4mm or 5mm bolts, so a small multi-tool or a set of Allen wrenches will cover you. Check the bolt heads before you buy—they are usually marked with the size.

You may also need a second person to hold the front wheel steady while you work, though it is not essential. Some people use a bike stand to hold the frame, which makes the job easier but is not required.

If you plan to move spacers from below the stem to above it, you will need to remove the stem first. In that case, you may also want a small container to keep the bolts and spacers organized so you do not lose them.

Step-by-step: raising a threadless stem

Step 1: Loosen the stem bolts. Locate the four bolts on the front face of the stem (the side facing you). These are the clamp bolts that hold the handlebars in place. Using your Allen wrench, turn each bolt counterclockwise about one full turn. You do not need to remove them completely—just loosen them enough that the stem can slide.

Step 2: Slide the stem upward. Gently pull the handlebars and stem upward along the fork's steerer tube. Move them to the height you want. The stem will slide smoothly if the bolts are loose enough. Do not force it; if it sticks, loosen the bolts a bit more.

Step 3: Tighten the bolts evenly. Once the stem is at the right height, tighten the four bolts in a cross pattern: top-left, bottom-right, top-right, bottom-left. This ensures the stem clamps evenly and does not twist. Tighten each bolt a quarter turn at a time until they are snug. Do not overtighten—you should feel resistance, but you should not need to strain.

Step 4: Check alignment. Look down at the handlebars from above. They should point straight ahead, parallel to the front wheel. If they are twisted, loosen the bolts slightly and adjust, then tighten again in the cross pattern.

Moving spacers to gain more height

If the stem is already high but you need it higher still, check whether spacers sit below it. Spacers are thin metal or plastic rings stacked on the steerer tube. If some are below the stem, you can move them above it to raise the handlebars further.

To do this, you will need to remove the stem. Loosen the four clamp bolts completely and slide the stem off the steerer tube. The spacers will come loose. Rearrange them so more sit above the stem than below it, then slide the stem back on and tighten the bolts. This is a bit more involved than a straightforward raise, but it takes only a few extra minutes.

There is a limit: the stem cannot go higher than the top of the spacer stack. Once all spacers are above the stem, you have reached the maximum height. If you need the handlebars even higher, you will need to replace the stem with one that has a greater rise (the angle of the stem affects how high the handlebars sit) or use a different stem design altogether.

Threaded stems: a less common alternative

If your bike is older, it may have a threaded stem instead of a threadless one. These are less common now but still appear on vintage or entry-level bikes. A threaded stem screws into the fork's steerer tube rather than clamping around it.

To raise a threaded stem, you loosen the top cap bolt (a single bolt on top of the stem) by turning it counterclockwise. This releases tension on the headset. Then you unscrew the stem itself by turning it counterclockwise and pulling it upward. Once it is at the height you want, you screw it back in clockwise and retighten the top cap bolt. You may need a headset wrench (a specialized tool) to do this properly, and the process is more fiddly than a threadless stem.

If you are unsure whether your stem is threaded or threadless, look at the top of the fork. A threadless stem has a cap bolt on top and four bolts on the front. A threaded stem has only a cap bolt on top and no front bolts.

When you have reached the limit

If the stem is already at the top of the spacer stack and you still need the handlebars higher, you have a few options. The simplest is to replace the stem with one that has a greater rise—stems come in different angles, and a stem angled more upward will raise the handlebars without moving the stem higher on the fork.

Another option is to use a stem riser or shim, which is an adapter that sits between the stem and the steerer tube to add height. These are inexpensive and work well if you only need a small increase.

If you are uncomfortable replacing the stem yourself, a bike shop can do it for you in a few minutes. Bring your bike and tell them the current stem size and angle; they can recommend a replacement that will give you the height you want.

Frequently Asked Questions

How tight should the stem bolts be?

Tight enough that the stem does not slip when you pull on the handlebars, but not so tight that you strain to turn the wrench. A good rule of thumb: tighten until you feel solid resistance, then stop. If the stem slips during a ride, tighten the bolts a bit more next time. If you strip a bolt (the wrench spins without tightening), you tightened too hard.

Can I raise the handlebars on any bike?

Yes, but how much you can raise them depends on the spacer stack. Most bikes have at least a little room to raise the handlebars. If you have already moved all spacers above the stem and it is still not high enough, you will need a new stem or riser.

Will raising the handlebars affect how the bike handles?

Raising the handlebars makes the bike feel more upright and relaxed, which is more comfortable for casual riding. It may feel slightly less responsive in tight turns because the weight distribution changes slightly, but the difference is usually small and most riders do not notice it.

Do I need to adjust anything else after raising the handlebars?

Usually not. The brake and gear cables may need a tiny bit of slack if you raise the handlebars a lot, but most bikes have enough cable length built in. If the cables feel tight or the brakes or shifters feel stiff after you raise the handlebars, take the bike to a shop to have the cables adjusted.

What if the stem is stuck and will not slide?

Loosen the bolts more and wait a minute—sometimes the stem is just tight from friction. If it still will not budge, explore a small amount of penetrating oil (like WD-40) around the base of the stem where it meets the steerer tube, wait 15 minutes, and try again. Do not force it or you may damage the fork.