So here is a curious one to pop up on Kickstarter. How to lessen road vibrations before they impact the rider in as few parts as possible. Those of us here at BikeRumor with backgrounds in the shop have seen tons of customers complain about seat discomfort. Sometimes it was about a recent back procedure, other times it was simply a pain in their butt. The one common thread though, was that there weren’t a ton of different options besides thickly padded saddles, so it’s nice to see another take on the issue.

The designers and engineers behind the new Rinsten Spring have managed to develop a device that does that with just five individual parts, and on top of that the design will work on pretty much any bike out on the road or trail that has a few extra cms of seatpost showing. The concept and execution are both incredibly simple – Rinsten has created a looped leaf spring that clamps inside the saddle clamp of your existing seatpost, then cantilevers your saddle on a second rail clamp about 6cm higher up…


It doesn’t get much more simple…

The leaf spring that supports the saddle (and this the rider) is a simple loop of spring steel that is rated for rider weights up to 150kg/330lb.

Then it just has a 2-part alloy clamping mechanism and 2 bolts that hold it together. By adjusting how far back from the bend the two clamps are attached, you adjust the arm of the cantilever, and thus the stiffness of the spring.

Sure there isn’t a huge amount of damping in a steel spring (at least not unless it is exceeding its elastic limit, which this shouldn’t do before 400kg based on their test data), but this could even out some rough and regular vibration. It also might be able to help riders who have some other biometric or pedaling issues.

In any case, it is a simple device at a reasonably affordable price that will likely deliver a ride much like a classic springer saddle, all while working with your current saddle and seatpost.

If that sounds interesting give their Kickstarter campaign a further look. At just $25 for the earliest bird backers and topping out at $31 per spring it is an affordable experiment to make. And one that they are backing with a full 30 day money back satisfaction guarantee, and a lifetime warranty if you keep it. The crowdfunding just went live today and will run for a month. It’s on its way with 17% of its funding goal being achieved within the first couple of hours live. If they get their funding, you should have a spring in your saddle by the end of July 2017.


  1. Juanny on

    So, is the idea to have the saddle at 0-degrees once under the load of the rider’s weight? How is that done? Trial and error?

  2. killa cam on

    Assuming no one pulls up on clipless pedals unless climbing, would this reduce power output? I know a rear shock would, but is it different when it comes to butts? I know the iso speed decoupler is supposed to do the same thing…

    • gringo on

      (deleted), next time that you want to whine about the way others ride, perhaps you should watch the whole video first. Plenty of helmets to be seen.
      Why do Americans always cry about helmets in videos?

      • Paulette on

        Thank you.. maybe want to ask if they want cheese with that whine…. Americans complain about pictures on cereal boxes.. lol. And I am American!!

    • Tomi on

      None of the helmetless riders in that video were riding faster than an average runner. Do you put an helmet when you run and would you advise runners to wear helmets too ?

      • george on

        so by your logic kids shouldn’t wear helmets cause they aren’t riding faster than runners. Sure that makes sense. Send everyone out to play in traffic without a helmet.

  3. Anonymous on

    It’s a spring saddle converter.

    It would see slightly safer if installed upside down. I’ve seen lots of saddles slide back, not so many slide forward.

  4. chase on

    There are several other post suspension designs currently out there for purchase.
    I don’t think I want my saddle rotating back at an angle as it compresses. That would be very odd. Not to mention the twisting you would get into mounting and dismounting or putting a foot down. Needs more control to keep it level and in a single plane. This is for sure simple. Too simple if you ask me.

    Look at this-

  5. Jami on

    Don’t know if this was even made up by cyclists or just by engineers looking to throw out an easy product. Nobody wearing a helmet and all the cycling in that video was super impractical and awkward. Not saying it’s a bad idea, just bad marketing.

    • Colin M on

      Jami, did you not see the pack of 10 roadies go by in the video? They were all wearing helmets.

      BTW I love getting saddle sores so I’m buying this RINSTEN SPRING. Such high quality!

  6. Rippin Ronnie on

    Hey lets stick a bottle cage between our seatpost and saddle and sell in on Kickstarter. Or sell it for 19.95 and have the Slap Chop guy promote it on QVC

  7. Slacker on

    And the photos above, look how well the seat height is adjusted, her legs are at the perfect angle, these guys know cycling.

  8. Bill on

    I think I just realized sometimes BikeRumor posts stupid things pretending to be news as a deadpan way of making fun of them…

  9. Dtronn on

    I think it would be effective for an occasional large bump.. or to soften some hard chatter.
    There wouldn’t be any boing boing boing … hence the ability to shorten the spring arms.. think before speak.

  10. Mikey on

    I actually think this in an ok idea. It also gives huge fore-aft adjustment possibilities. But the price is crazy for a bent steel tube…

  11. Oli on

    Seriously, none of these riders are wearing any form of ballistic protection. You’re statistically more likely to die from gunshot wound in USA, than from head wounds sustained whilst riding a bike. These people are just asking to get shot!

  12. Dan on

    Going to buy 2 for my road bike and install between the hubs and frame/fork. Cheap way to make a dual suspension bike. The mtb industry is going to go out of business.

  13. Steveroot on

    I have one on my Tern Verge S11i (folder with 20″ wheels) and have ridden it to work for 2 days (about 15 miles). I have it set for a fairly high spring rate to match my weight. It actually makes the saddle feel slightly “plush”. Although there is no damping in the mechanism itself, there is no “pogo-sticking”… damping is effectively provided by the rider’s (m)ass. The saddle flattens out as soon as I sit on it, and does not feel as if it is rocking side-to-side. I have not snagged my (work) pants on the prongs, and my legs do not come anywhere near the spring. It’s a bent steel *rod*, not a tube. I can imagine that this is not something that *everyone* will want, but it is not a gimmick.


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