
To determine the stroke length of a rear shock, you need to measure the amount of travel on your shock, also known as the shock stroke. This is the total distance the shock compresses from being fully extended to fully compressed. The stroke length is usually printed on the side of the shock, but if not, you can measure it yourself. The process differs depending on whether you have a coil or air shock. For coil shocks, you need to remove the spring and measure the exposed shaft. For air shocks, you need to pull the air can off and measure the piston on the inside. Alternatively, you can refer to the manufacturer's website or manual, which should list the specifications, including the eye-to-eye length and the stroke length.
Characteristics | Values |
---|---|
How to find stroke length | Refer to the manufacturer, or measure the distance between the eyelets on the shock |
Eye-to-eye length | Measure the distance between the centres of the bolts holding the shock at each end |
Stroke length | Measure the distance the shaft travels between full extension and full compression |
Shock sizing | The overall length of the shock (eye-to-eye) and how much it can be compressed (the stroke) |
Air shocks | Pull the air can off to measure the piston on the inside |
Coil shocks | Remove the spring and measure from where the shaft goes into the shock body to the start of the eye on the shaft |
What You'll Learn
Check the shock for an ID sticker
To check the stroke length of your rear shock, you can refer to the ID sticker on your shock. This sticker will provide detailed information about your bike's shock absorber.
ID stickers are usually found on the shock itself, either on the back side of the crown or on the lower leg of the right side. If you have a spring-loaded rear shock, the service number will be located on the expansion tank or adjustment block. The ID sticker will provide the eye-to-eye length of the shock, which is the distance between the eyelets, as well as the stroke length, which is the distance the shaft travels between full extension and full compression.
For example, a shock with a 230mm x 60mm specification has an eye-to-eye length of 230mm and a stroke length of 60mm. This information is crucial when upgrading to a new shock or servicing your existing one.
If you cannot locate the ID sticker, you may need to refer to the technical description of your bike to gather information such as the full model name, wheel size, travel, and year of manufacture. This information can then be used to identify the correct shock absorber for your bike.
Additionally, some manufacturers provide websites where you can input the serial number or model code to obtain detailed information about your shock, including the stroke length. This can be a helpful resource if you are unable to find the ID sticker or if the sticker is illegible.
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Look up the ID on the manufacturer's website
If you are looking to find the stroke length of your rear shock, you can look up the ID on the manufacturer's website. This will give you all the information about your shock.
For example, if you have a FOX shock, you can find the shock custom tune ID printed on the label around the air sleeve. This will be a 3-digit code, for example, C372. Once you have this code, you can go to the FOX website and enter the information on the help page. The page will then list all the information regarding the specific code.
If you have a ROCKSHOX shock, you can find the serial number on the back of the crown or on the lower leg of the right side. You can then go to the RockShox TrailHead website and enter the serial number. This will take you to a page with information about your shock.
If you cannot find the serial number or ID on your shock, you will need to find the full model name, wheel size, travel, and year of manufacture. This information can usually be found in the technical description of your bike. With this information, you can then search for the correct service kit or spare parts for your shock on the manufacturer's website.
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Measure the eye-to-eye length
Measuring the eye-to-eye length of your rear shock is a simple process. This measurement refers to the total length of your shock, or the effective overall length, and is among the easier things to measure. Simply take a measurement from the centre of each shock eyelet to find the overall length of your shock. This is the eye-to-eye length.
It is important to note that this measurement is different from the stroke length. The eye-to-eye length is the measurement of the shock at full extension. The stroke length is how far the shaft travels between full extension and full compression.
If your shock mounts are rotated 90 degrees from each other, or it bolts directly into the yoke from its end, rather than pivoting on a bolt and bearings, then the eye-to-eye measurement is a little more difficult. In this case, measure from the outside edge of one hole to the inside edge of the other (at the 9 o'clock position on both holes).
You can also measure the eye-to-eye length by removing the shock and using a video guide to take you through the basic process of removal and reinstallation. This will also show you how to measure travel, eyelet hardware width, and bolt diameter. This information is important when upgrading to a new shock or removing a shock for service.
It is important to always wear safety glasses and protective gloves during service to prevent potential injury. Failure to wear protective equipment during service may lead to serious injury or death.
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Measure the stroke length
The stroke length of a rear shock is the total length that the shock can compress on bottoming out. This is different from the eye-to-eye length, which is the distance between the centre of the eyelets on the standard mounting when the shock is fully extended.
To measure the stroke length, you will need to know the eye-to-eye length of the fully extended shock. Then, completely compress the shock by letting out the air or removing the coil. Measure the eye-to-eye length again and subtract this second measurement from the original eye-to-eye length. The resulting value is the stroke length.
It is important to note that you should not increase the stroke beyond what the frame manufacturer recommends. Doing so can cause issues with the frame bottoming out and potentially damaging it.
The stroke length of a rear shock can usually be found printed on the side of the shock. It is often included in the form of "fitting length" or "eye-to-eye distance", followed by a measurement in millimetres. For example, "230X60" indicates a shock with a 230mm eye-to-eye distance and a 60mm stroke.
Additionally, some manufacturers, such as Fox, provide an ID sticker on their shocks. By entering the ID into the manufacturer's website, you can access detailed information about your specific shock, including the stroke length.
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Check the manufacturer's specifications
When it comes to determining the stroke length of your rear shock, consulting the manufacturer's specifications is crucial. This information is typically available on the manufacturer's website or in the bike's manual, making it easily accessible. For instance, RockShox provides detailed specifications for its rear shocks, including the eye-to-eye length, stroke, and mounting hardware.
By referring to the manufacturer's specifications, you can ensure that you have the correct measurements for your specific bike model. This is essential, as using the wrong shock length can lead to irreparable damage to your bike and significantly alter its geometry. It's worth noting that some manufacturers may not provide this information readily, so it's helpful to know how to measure the stroke length yourself as a backup option.
In addition to the stroke length, manufacturers' specifications will also provide other critical measurements, such as the eye-to-eye length, which refers to the total length of the shock from one mounting bolt to the other. This measurement is vital for ensuring a proper fit and optimal bike performance. Using a shock that is too long or too short can have adverse effects on your bike's performance and may even void the warranty.
When consulting the manufacturer's specifications, pay close attention to the specific model of your bike, as different models may have varying requirements. Additionally, be mindful of the type of shock you intend to use, such as an inline or reservoir shock, as this can impact the compatibility and performance of your bike.
It's also important to consider the mounting hardware, as it plays a crucial role in ensuring a secure fit for your shock. The type and specifications of the mounting hardware will be determined by the specific frame design provided by the manufacturer. This includes factors such as the use of bushings, bearings, or other mounting options. By cross-referencing the manufacturer's specifications with your own measurements, you can ensure that you select the appropriate shock and hardware for your bike.
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Frequently asked questions
The stroke length is usually printed on the side of the shock. It can also be found by measuring the eye-to-eye length, which is the distance between the centres of the bolts holding the shock at each end.
The eye-to-eye length is the total length of the shock, while the stroke length measures the total distance the shock compresses from fully extended to fully compressed.
Remove the spring and measure from where the shaft goes into the shock body to where the eye starts on the shaft.
Pull the air can off and measure the piston on the inside. Alternatively, measure from the lip of the wiper seal to the end of the air shaft.
Knowing the stroke length is important when upgrading to a new shock or removing a shock for service. It is also necessary to set the correct sag.