FAQ: ShockStop Seatpost: Add Suspension to Your Bike
For the most up-to-date information about the status of our project, check our project updates on Kickstarter!

What if my weight fluctuates between two of the ranges?

If your weight fluctuates, choose the higher weight category.

Last updated: June 20, 2018 06:50

How do I choose the right stem angle and length?

We put together a set of instructions that can help you determine the length and angle of your existing stem and provide guidance on what to chose based on riding style - check it out here: https://redshiftsports.com/how-to-choose-length-angle-shims

Last updated: June 20, 2018 06:49

How do I know if I need handlebar shims for the stem?

We put together a set of instructions that can help you determine if you need handlebar shims - check it out here: https://redshiftsports.com/how-to-choose-length-angle-shims

Last updated: June 14, 2018 14:58

Will my saddle bag fit with the ShockStop Seatpost / What bags work best?

Since the saddle rails move relative to the post as the suspension compresses, many standard saddle bags might not work well with the ShockStop Seatpost. (typically these bags connect to both the rails and the post in a rigid or semi-rigid manner)

We've partnered with Silca to offer their line of Seat Rolls and Seat Capsule bags, which attach to the seat rails using the super-secure Boa lacing system. These bags work perfectly with the ShockStop Seatpost and you can add them to your order in BackerKit when filling out the survey.

Last updated: June 14, 2018 11:27

Is the ShockStop compatible with a Di2 battery BT-DN110?

Yes, the seatpost is compatible with mounting a Di2 battery - we have a ShockStop-specific mounting option that you can add to your order as an add-on in Backerkit when you fill out your survey.

Last updated: June 13, 2018 15:55

If I order the ShockStop System, when will I get the Stem?

If you’d like to get the ShockStop Stem shipped right away, just add the "Early Stem Shipping" add-on when filling out the survey in Backerkit. Otherwise the stem will ship with the Seatpost.

Last updated: June 13, 2018 15:55

Is the ShockStop Seatpost compatible with my folding bike?

The ShockStop Seatpost is 27.2mm in diameter and 350mm long. Typically, folding bikes use very long seatposts in larger diameters, but many folding bikes come with and can work with telescopic seatposts. These allow you to use a standard seatpost like the ShockStop by adding an extension that fits into the bike and accepts the standard seatpost. Check with you local bike shop or bike manufacturer to see if one of these is available and if it accepts 27.2mm seatposts. An example of one that accepts 27.2mm seatposts is the Tern telescopic seatpost: https://www.ternbicycles.com/us/gear/471/telescopic-seatpost.

Last updated: June 14, 2018 11:31

What is the minimum installation height?

The ShockStop Seatpost requires at least 90mm from the top of the seat tube collar (the part on your bike that holds the seatpost in place) to the center of the saddle rail in the saddle clamp.

Last updated: April 10, 2018 10:45

How does international shipping work? Will I be responsible for VAT?

All international rewards will be shipped from the US and will have a declared value of the amount that you pledged, including shipping costs.

We will offer a prepaid option for those who would prefer to pay the taxes & duties up front. The shipping provider charges a fee of €10 for the prepaid VAT service (in addition to the tax and duty amount). We are continuing to look for cheaper options to prepay VAT and will update if we find some. If you don't choose the prepaid service you will be responsible for any taxes, duties, and fees that are due on import.

Last updated: June 13, 2018 14:57

Will the ShockStop Seatpost fit in bikes with seatpost diameters larger than 27.2mm?

Yes! The ShockStop Seatpost will fit any bike with a seatpost diameter of 27.2mm or larger. If your seatpost size is larger than 27.2mm you will need to use a shim which is a very common way to allow bikes to accept different size posts. If needed, you can add a shims to your order when filling out your survey or anytime before shipping. Shims are available in all standard sizes: 28.6, 29.8, 30.0, 30.9, 31.6, and 31.8 mm - just match up the size of your current seatpost and you are all set.

Last updated: June 14, 2018 11:34

Is there any damping in the system?

Damping is important for MTB because you're trying to absorb larger amplitude impacts. For high-frequency, small amplitude perturbations, it's better to have a very lightly damped system to maximize responsiveness. The plunger seals provide enough damping to prevent unwanted movement of the post, but otherwise, the system is free to respond quickly.

Last updated: April 10, 2018 09:09

Will the seatpost work with 7mm x 9mm carbon saddle rails?

Yes, we are offering 7mm x 9mm compatible saddle clamps as an add-on option that you can add to your order in Backerkit when you fill out your survey.

Last updated: June 13, 2018 15:56

How does it hold up to mud and sand?

The internal mechanism uses a custom seal to provide a robust barrier to mud, grit and water. They come from the same family of seals that you see on mountain bike front fork suspensions. While we expect these to hold up to heavy off-road usage, this will be a user-serviceable part if the need should arise.

Last updated: June 14, 2018 14:55

Will this work for aero seatposts/Trek seat mast?

Unfortunately, no, the ShockStop Seatpost only fits standard round seatposts that are 27.2mm or larger in diameter.

Last updated: April 10, 2018 05:45

Will this work for bikes with 25.4mm seat tubes like the Cannondale Synapse?

Unfortunately, no, the ShockStop Seatpost will only fit bikes that have seatpost diameters of 27.2mm or larger.

Last updated: April 10, 2018 05:45

Do you plan to offer a carbon fiber version?

Currently we do not have plans to release a carbon version. We’re keeping our efforts focused on delivering a fantastic product as soon as possible. If we get enough interest in a carbon version, we will consider adding it to our development roadmap once we’ve fulfilled all Kickstarter orders.

Last updated: April 10, 2018 11:59

How is the product tested?

The seatpost is tested to the latest ISO 4210 standard for Racing & Mountain Bicycles. These standards typically specify "Static Strength" tests (i.e. one-time application of force) as well as "Fatigue" tests (i.e. repeated application of force) for different bicycle components. We also run our own independent tests to better understand lifespan which typically involve cycling well beyond the specifications in the ISO 4210 standard.

Last updated: April 10, 2018 05:45

What is the warranty?

We stand behind every product that we sell, and we pride ourselves on the quality of our products, as well as the support that we provide to our customers. Redshift Sports warrants that all of our products are free from defects in material and workmanship for two years from the date of original retail purchase.

Last updated: April 10, 2018 05:45

Will the spring need to be replaced?

No, the spring is designed to last the lifetime of the seatpost. We’ve tested the performance of the springs extensively and selected the geometry and material of the spring specifically to withstand the rigors of daily riding without degradation.

Last updated: April 10, 2018 05:45

All about springs.

The seatpost uses an internal spring as the suspension element which can be replaced to adjust stiffness. During the survey we will collect rider weight and based on that we will send an appropriate set of springs with each seatpost.

If, in the future, you decide that you want to try a different stiffness spring, we will have other spring stiffnesses available for purchase at a substantial discount for Kickstarter backers.

Last updated: June 13, 2018 16:04

Is the stiffness adjustable?

Absolutely - We designed the ShockStop Seatpost so that you can adjust it to perfectly match your weight and riding style. The internal spring can be changed so you can can choose the spring stiffness. And you can use the preload adjustment knob at the bottom of the seatpost to adjust the spring preload - the amount of force required to cause the saddle to start moving. Together, the stiffness and preload allow you to dial in the feel to your exact preference.

Last updated: June 13, 2018 16:01

Shipping Updates
For the most up-to-date information about the status of our project, check our project updates on Kickstarter!
No shipping updates are provided.
BackerKit FAQ

What is BackerKit?

BackerKit is a service that crowdfunded project creators use to keep track of hundreds to tens of thousands of backers—from shipping details, pledge levels, preferences and quantities, whether they have paid or had their card declined, special notes, and everything in between!

The BackerKit software and support team is independent from the campaign’s project team—BackerKit does not handle the actual reward shipping. For more information about the preparation or delivery status of your rewards, please check the project's updates page.

How does BackerKit work?

After the campaign ends, the project creator will send you an email with a unique link to your survey. You can check out a walkthrough of the process here.

How do I update my shipping address?

BackerKit allows you to update your shipping address until the shipping addresses are locked by the project creator. To update your address, go back to your BackerKit survey by inputting your email here.

I completed the survey, but haven't received my rewards yet. When will they arrive?

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Why can’t I log into my account?

Request a login link to your survey by entering your email here:
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BackerKit will send you an automated email with an invite link to whatever email you pledged with.

I never received my invitation. How do I complete the survey?

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When will my order be shipped, charged or locked?

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Can I upgrade or get multiple copies of my pledge?

This depends on the project creator’s decision. If you are unable to see the ‘Want to switch your pledge level?’ after clicking on your pledge amount under “Pledge Level” in your survey, then the project creator would prefer people not to switch pledge levels.

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