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Carbon fiber solid seat pan by strips.

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    Carbon fiber solid seat pan by strips.

    Hi guys.

    Finally here is the result, very cool for my taste and the best of all, they work like a suspension.
    I want to say if something works for me, be sure that will work for you, because i take things to the limit, i don`t like been sitting in a chair been carefully and going down curbs slow because i`m afraid if it breaks.

    Before i have did test with playwood strips, and all was ok until i start going down curbs, no problem if i did it slow but if i jump it the strips crack, so i was changing sizes of strips and thickness until they don`t crack.
    After that knowing how strong was the strip of playwood and comparing with carbon fiber i did some calculations, and i wasn`t sure that the solid seat pan with 3mm thickness that Oracing was going to give me will work for strips, so i told them that i didn`t want it because i was going for a thicker sheet for my strips.

    My weight is around 180lbs, so depending weights we will have to go for differents sizes of strips or thickness.
    Now what i have to see is the lifetime of this, but i don`t think there will be any problem, because CF have a good fatigue life, so that, i will see it with the time.

    Another thing i want to say, is that all carbon fiber are not the same, they are differents ways to do it, putting the CF layers in different directions, different CF clothes, etc. So maybe you think is the same, but sheets with the same thickness could be very different, i post a pic where you can see two sheet done different, look the layers in the sides, one is much stronger than the other and you could go with a thinner sheet with the sheet of the top.

    I did this video for you can see what i`m speaking about, sorry for my english.

    Here you`ve got a bunch of pics.

    Last edited by totoL1; 9 Oct 2010, 12:12 PM.

    #2
    Another few pics, i only add 239 grames to my chair.

    Comment


      #3
      Totally cool. You're amazing!!

      And it's all held on with Velcro? That gives me some pause. How well will that hold up over time?

      You might want to add some protective edge guard stripping around some of the strips, at least the one in the front to keep it from scratching you.
      stephen@bike-on.com

      Comment


        #4
        Originally posted by stephen212 View Post
        Totally cool. You're amazing!!

        And it's all held on with Velcro? That gives me some pause. How well will that hold up over time?

        You might want to add some protective edge guard stripping around some of the strips, at least the one in the front to keep it from scratching you.
        Well, this is just an experiment, so the easiest way to fix it was with velcro, anyway it works ok, i was the last month with the playwood strips fixed with velcro without any problem and the advantage you`ve got it`s that you can take out your seat pan in a second for clean better all the frame.
        You can understand that i`m not going to open holes in my frame for fix it with bolts, if i have problems in a future i will think another way, maybe with bridas, i don`t know the name in english.

        About the edges of the strips don`t worry, you don`t see it, but all they are sanded, so you can`t get scrath with them.

        Comment


          #5
          What thickness CF did you choose for the seat strips? Do you feel that you could have gone thinner? Are you a now a fan of suspension, this version of it anyway?

          And, again, Bravo!! With locking hubs, CF back rest and single-sided caster forks, your chair is pretty much my ideal.
          stephen@bike-on.com

          Comment


            #6
            Originally posted by stephen212 View Post
            What thickness CF did you choose for the seat strips? Do you feel that you could have gone thinner? Are you a now a fan of suspension, this version of it anyway?
            Originally posted by stephen212 View Post

            And, again, Bravo!! With locking hubs, CF back rest and single-sided caster forks, your chair is pretty much my ideal.

            i use .017", going for thinner? Not recommend for 180lbs.



            I`m not a fan of suspension chairs, i think i will never buy a chair with suspension, for my daily use i don`t need a bike suspension, but this is different, i only add 239 grames, the rigidity of my frame still exactly the same and you don`t see nothing, even the frame look cleaner now, i don`t have clothes strips around the tubes.




            P.D: And your chair with CF sideguards will be near to my ideal too

            Last edited by totoL1; 9 Oct 2010, 1:09 PM.

            Comment


              #7
              That looks great. Nice job. I bet you could go thicker in the rear and thinner behind the knees. I might want a little less flex, since I have access to a suspension chair if I want to use one. My therapist recommended an ergo seat for me, and this is a terrific mod for that frame style, in particular. Kudos!
              "I have great faith in fools; self-confidence my friends call it." - Edgar Allen Poe

              "If you only know your side of an issue, you know nothing." -John Stuart Mill, On Liberty

              Comment


                #8
                Originally posted by DaleB View Post
                That looks great. Nice job. I bet you could go thicker in the rear and thinner behind the knees. !
                That is what i thought too, and i did it with playwood and have a few cracks in the front strips in transfers, remember when you transfer to the chair, usually all the weight of your body go to the front part of the seat, and after you go behind.

                What you can see is that the rear strip of the ergo part is deeper than the others.

                Originally posted by DaleB View Post
                . I might want a little less flex, !
                Don`t think that you are going to be like a yoyo in the chair, i did this morning my 10km ride and was perfect, you only will notice the flex over bumps, transfers to the chair and going up and down curbs, but in good paviments you don`t feel nothing, just like normal uphostery.
                Last edited by totoL1; 9 Oct 2010, 2:44 PM.

                Comment


                  #9
                  Originally posted by DaleB View Post
                  My therapist recommended an ergo seat for me, and this is a terrific mod for that frame style, in particular. Kudos!
                  What did they tout as a benefit of the ergo seat?

                  Comment


                    #10
                    Very innovative work toto! And, I might add, a very welcome distraction from the other major thread that's going on right now!

                    I'd be up for trying something like that when my upholstery wears out. I'd add a couple additional cf strips longitudinally just inside the seat rails could hold everything together and prevent side to side movement.

                    I'm not a big fan of Velcro, however. 3M Exterior Mounting tape would attach it to the frame better than Velcro, yet it can still be removed without leaving a bunch of goo.

                    Comment


                      #11
                      Originally posted by SCI_OTR View Post
                      What did they tout as a benefit of the ergo seat?
                      You know the line, straight off the marketing brochure. No different.
                      "I have great faith in fools; self-confidence my friends call it." - Edgar Allen Poe

                      "If you only know your side of an issue, you know nothing." -John Stuart Mill, On Liberty

                      Comment


                        #12
                        Originally posted by SCI_OTR View Post

                        I'd be up for trying something like that when my upholstery wears out. I'd add a couple additional cf strips longitudinally just inside the seat rails could hold everything together and prevent side to side movement.

                        I'm not a big fan of Velcro, however. 3M Exterior Mounting tape would attach it to the frame better than Velcro, yet it can still be removed without leaving a bunch of goo.

                        Something like this will work fine, because all the strips are only one piece and if you don`t like velcro it will be easier to fix to the frame because is just one piece and you will not need a lot of mounting tape.
                        Of course is bit more difficult to do, because you have to drill the sheet and after make the cuts inside with a jigsaw for example.

                        Comment


                          #13
                          Originally posted by totoL1 View Post
                          Something like this will work fine, because all the strips are only one piece and if you don`t like velcro it will be easier to fix to the frame because is just one piece and you will not need a lot of mounting tape.
                          Of course is bit more difficult to do, because you have to drill the sheet and after make the cuts inside with a jigsaw for example.
                          Very innovative - i bet you could get a nice side business going selling something like that! How long before I can get one through sportaid?

                          Comment


                            #14
                            Originally posted by taziar View Post
                            Very innovative - i bet you could get a nice side business going selling something like that! How long before I can get one through sportaid?
                            Agreed. I wanted to do this on my chairs but finding someone with the know-how. . .
                            stephen@bike-on.com

                            Comment


                              #15
                              Originally posted by taziar View Post
                              Very innovative - i bet you could get a nice side business going selling something like that! How long before I can get one through sportaid?
                              Toto,

                              Just make sure you charge charge almost as much as the entire assembly for any replacement components and require them to ship their chair to Spain if new Velcro is required. After all, it could be considered an integral part of the frame and proprietary!

                              Comment

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