Are BMX Stem Bolts Universal? (Explained!)

Stem bolts are being used for many years to fasten the objects more tightly. The stem bolts come in different sizes and shapes but are they universal when it comes to BMX stem fasteners.

Are BMX stem bolts universal?

The BMX stem bolts are only universal for BMX bikes. The different sizes of stem bolts includes 5/16″, M5, M6, M8, etc. but for a perfect stem set up it is better if you measure diameter of your stem bolt. Otherwise, the stem bolt will not be tighten perfectly and may cause twist on the steerer.

BMX stem bolts come up with different sizes and measurements. So, it can be universal for only the BMX bikes or else they aren’t universal. If you do want to fit them in other bikes, you need to take the actual measurement of the bolts.

Due to variation in the diameter of the head, all stems do not fit the forks of all types of bikes. While replacing your stem, make sure the stem holds the bars tightly, and the stem is according to your size.

What size are BMX stem bolts?

There are different sizes of BMX stem bolts out there. Such as 5/16″, M5, M6, M8, etc.

For the M5 BMX stem bolt, M refers to the Metric designation for bolts, and 5refers to the bolt’s diameter measured in millimeters. For M5 bolts, the thread’s standard pitch is 0.8mm.

For the M6 BMX stem bolt, its diameter is 6mm, and the thread’s standard pitch is 1.0mm.

For the M8 BMX stem bolt, its diameter is 8mm. For M8 bolts, the thread’s standard pitch is either 1.0mm or 1.25mm. Here, 1.25mm is the standard measurement. The threaded portion’s length is about 24mm, but overall its length is 33mm. The diameter of the head is 11mm.

Are stem bolts universal for all bikes?

Stem bolts are not universal for all bikes. All types of stem bolt cannot easily fit into all bikes as it varies the size of the thread. So, if you want to use stem bolts on any bike, it is required to take the proper measurement of the size of the bolts first.

The stem bolts are of many sizes. Each size has a different thread pitch and standard measurement. The diameter of the head is different for every stem bolt.

Different brands have stem bolts of various sizes.

Most of the stem bolts thread matches with M5 or M6, but it is better to measure the size of the bolt first.

All kinds of stem bolts will not fit in every bike around there. You should have taken the exact measurement of your stem bolts and look forward to buying them from shops. Measuring a stem bolt is a must to get the desired stem bolt for your bike.

How tight should stem bolts be on BMX?

The stem bolt should not be very much tight on your BMX. Tight your bolt as much it is said on the stem. Making your bolt very much tight can make your stem twist on the steerer. Overtightening may cause severe damage to your stem.

While you are tightening your bolt, tighten it just for a few turns in the right direction. Continue the tightening and make sure you are doing it right. When you reach a maximum of 8.5nm (75inch/pounds), just stop there. That’s enough for a stem bolt.

There is not only a single bolt in your bike. You should tight each of the bolts with the same load. It makes your bolt durable. If you tight your stem bolt more than the current load, you may lead your stem to damage.

What is a self-sealing stem bolt?

A self-sealing stem bolt is not like all other bolts out there. It is a type of stem bolt that seals itself. These bolts bear a primary component of a technology that is used for construction purposes. That technology is named reverse-ratcheting routing planers.

In a self-sealing stem bolt, there exists 80% mixed uranium, mixed alloys, aluminum, 11% electrically modulated ceramic, and 9% thermally stabilized plastic.

How tight should stem bolts be?

The stem bolt should not be tight very much. Tight your bolt as much it is said on the stem. Making your bolt very much tight can make your stem twist on the steerer. While you are tightening your bolt, tighten it just for a few turns in the right direction.

Continue the tightening and make sure you are doing it right. When you reach a maximum of 8.5nm (75inch/pounds), just stop there. That’s enough for a stem bolt. Overtightening may cause severe damage to your stem. There is not only a single bolt in your bike.

You should tight each of the bolts with the same load. It makes your stem durable. If you tight your stem bolt more than the current load, you may lead your stem to damage.

Do all stems fit all bikes?

No, all the stems cannot fit all bikes. Only the stems made for the BMX bike fit the bike easily. Different manufacturers manufacture different length stems. Based on frames, stems are selected for a bike. For smaller frames, shorter stem fits, and for larger frames, longer stem fits.

In the market, you can find both shorter and longer stems for your BMX bike. You buy any stem which is preferred according to your height.

How to replace BMX stem?

Replacing the BMX stem is not a hard task. Let us start with the removal of the old stem:

Most of the BMX stem are nowadays very similar. It does not matter whether they are top-load or front-load; they have a four bolts system.

The four bolts system bolts the bars on tightly. Here we are going to replace an FSA black eye stem for the BMX bike, which is a threadless stem.

While you remove the stem, you may use a bike stand, or you can just keep the bike on the ground. Mainly, there are three things to loosen and tighten: the compression bolt into the fork, the stem bolts that clamp it onto the fork, and the bolts that clamp the bars.

Start by loosening the bolt that clamps to the forks. Then loosen the compression bolt. This is done because the compression bolt holds the headset and everything tightened together.

Loosen all the bolts carefully and quickly. Next, loosen the bars. When you loosen the handlebars, give it a turn in a star pattern. It helps to save your bolts from damage. Take off everything smoothly and straightly.

Then, by loosening the bolts, take out the back-right bolt completely. Remove the handlebars, then. Then remove the top cap and take off the stem completely.

Next is the installation of a new stem:

If your new stem has a different thickness than your old stem, you may need to add or remove spacers. Make sure that your fork is a little bit shorter than your stem. You don’t want the top cap nut to actually hit the fork.

Put the spacer into the fork. Then put the stem in its position correctly. Line up the stem so that it installs on the fork easily. Then put the compression stem bolt back in.

Remove the front stem cap by taking out the top right bolt completely. Install the handlebars in their desired position. Put the front stem cap to its correct position. You can apply a little bit of grease to the threads of these bolts. Get all the bolts to the thread in straight. Then tighten it just a little bit. Make you’re your handlebar is put in the center position.

If needed, you can get on your bike and see everything is perfect and comfortable. Then tighten the bolts fully so that there is no gap between the cap and the actual stem on the top and bottom and make sure they are the same. Get all the bolts at the same tightness. You may use a torque wrench for that. Tightening up to 8nm is perfect.

I hope you did well!

How do you tighten a BMX stem?

While replacing a stem, it is required to tighten the BMX stem. Configuring the stem to the fork, putting the compression stem bolt-on, and putting the handlebars to their desired position, it’s now required to tighten the bolts of the front stem cap.

Ensure that your bars and forks do not move at all. Then the stem bolts ats per needed.

A BMX stem should not be tightened very much. Use a torque wrench and tight up to 4-6nm. Don’t use anything except the torque wrench as it would damage the stem. While tightening, ensure that the distance between the cap and stem body is equal.

How long should my bike stem be?

Your bike stem should not be that long. It should be comfortable for you to ride your bike and adjust to everything properly. If you are taller, you may choose a larger stem.

And, if you are shorter, you may choose a smaller stem. It depends on you. There are different types of stems with different lengths available in the market.

A BMX bike stem has a different length. The length mainly varies from 80 to 140mm. Among these, the most common bike stems length ranges from 100 to 110mm.

Frequently Asked Questions:

Are BMX bikes good for cruising?

Are BMX bikes good for commuting?

Are BMX bikes good for exercise?

Are BMX bikes good for mountain biking?

Are BMX bikes good for dirt jumping?

Are BMX bikes good for off road?

Are BMX bikes fast?