Announcement

Collapse
No announcement yet.

Schlumpf 2014

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #46
    I just finished building another 36er, for mostly offroad and fast gravel riding. I really love how a 36er tracks and maintains inertia, it is incredibly fun to roll big obstacles from up high, BUT it is also really tough to get up steep grades with such tall "gearing".

    I makes me wonder why a downshifting hub has not been a more talked about option.

    All of us have struggled with climbing and all of us have walked hills that were too steep to climb.

    If you think about the biggest advantages that bikes have over unicycling, really we're talking about two things: coasting and downshifting for climbing

    The coasting thing, well, I've been there and it's waaay above my pay grade.

    The downshifting thing, now that would really be something, it would increase the versatility of all my wheel sizes, allowing me to ride a bigger wheel in most situations.

    It's a pipe dream for sure, but if a downshifting hub were available, I'd have one on every unicycle I own. One caveat, it's got to be a "rideable" gear ratio, i.e. a 24-33% reduction.

    Unlike some people (Terry), I don't always want to push the envelope and work hard when I ride, sometimes I just want to chill out and spin along.

    I would expect that the reason the Schlumpf hub has not been more widely accepted is that folks like me just don't feel all that comfortable with a 50% step.
    I dream of hamsters and elderberries

    Comment


    • #47
      Just to clarify, I have never considered gearing up my 36er and have no interest in falling at 25mph, when doing so/upd-ing at 15mph can be bad enough! And yeah, 1:2 would be a huge jump and not very practical. I think the current 1:1:5 is the perfect ratio, at least for a G26er, IMO.
      Last edited by MuniAddict; 2014-09-09, 04:11 PM.
      Happy Birthday Terry! Every year you get cooler, younger and unicyclier!
      Be our muniprohpet for many years more.
      -Dani Buron


      Website
      Videos
      Facebook

      Comment


      • #48
        Originally posted by Nurse Ben View Post
        I just finished building another 36er, for mostly offroad and fast gravel riding. I really love how a 36er tracks and maintains inertia, it is incredibly fun to roll big obstacles from up high, BUT it is also really tough to get up steep grades with such tall "gearing".

        I makes me wonder why a downshifting hub has not been a more talked about option.
        What do you mean, you've talked about it forever. The reasons why it's a stupid idea have been covered forever as well. You want to take a uni with 2.5 extra pounds of rotating weight, and put in a hub with 2 pounds additional weight, so you can ride it in 29er mode, because you want to climb hills better? It's a completely bassackwards idea.

        Comment


        • #49
          Originally posted by Nurse Ben View Post
          If you think about the biggest advantages that bikes have over unicycling, really we're talking about two things: coasting and downshifting for climbing
          Only advantages I feel a bike has over me, is ease of use, and speed (higher gear). I think I speak for quite a few people here when I say I can crank up hills on my uni faster than my bike, so not sure how you think a uni doesn't have a low enough gear for hill-spinning!
          It is well known that a vital ingredient of success is not knowing that what you're attempting can't be done. A person ignorant of the possibility of failure can be a half-brick in the path of the bicycle of history.

          Comment


          • #50
            I'm agree with nurse Ben regarding a downshifting hub. I recently started doing cross country on my 36er and there's nothing quite like the feel of the 36er on a fast trail including down hill runs, the speed, the roll over advantage of the big wheel, and being high up there feeling like a champion

            For me the 36er is the optimum wheel size for cross country so it's the size I want to be on. I have a 24" a26" a 29" etc., but I think the 36er is king and the ideal size wheel for fast rolling trails.

            The only time I feel compromised is when I come to the occasional hill that I have to climb. This is when, instead of having to dismount and walk I would prefer to simply click into a lower gear, using a 1:0.5 gear ratio.

            So for road cycling I would run the existing schlumpf but for cross country I would go for a 1:0.5 downshifting hub.
            Last edited by unibokk; 2014-09-09, 07:26 PM.

            Comment


            • #51
              Originally posted by unibokk View Post
              The only time I feel compromised is when I come to the occasional hill that I have to climb. This is when, instead of having to dismount and walk I would prefer to simply click into a lower gear, using a 1:0.5 gear ratio.
              My experience on group rides is, the people who have to dismount and walk on off-road uphills have to dismount and walk whatever their effective gear ratio is, and the people who can make the climb can make it whatever their effective gear ratio is.

              Comment


              • #52
                My experience on group rides is, the people who have to dismount and walk on off-road uphills have to dismount and walk whatever their effective gear ratio is, and the people who can make the climb can make it whatever their effective gear ratio is.
                Yeah, downshifting on a unicycle, that would be totally impractical, shifting down to reduce effort on descents, shifting down to improve cadence on climbs, yeah, that would be a complete waste of time.

                I'm gonna go home and fix all my bikes so they aren't so inconvenient and heavy
                I dream of hamsters and elderberries

                Comment


                • #53
                  Originally posted by Nurse Ben View Post
                  Yeah, downshifting on a unicycle, that would be totally impractical, shifting down to reduce effort on descents, shifting down to improve cadence on climbs, yeah, that would be a complete waste of time.

                  I'm gonna go home and fix all my bikes so they aren't so inconvenient and heavy
                  How many of your bikes have 36" wheels?

                  Comment


                  • #54
                    Hello tholub, I've yet to ride a schlumpf geared uni but I've found that with longer cranks I can climb better.

                    If you apply the 1:0.5 ratio to a 150mm crank set, then on the lower gear you would in effect be riding with 300mm cranks but without a huge rotational axis. I reckon that setting would get get you up most hills even on a 36er

                    I wonder would it be an easy task for florian to just simply invert the current setting thus creating a new 1:0.5 approx..ratio hub??
                    Last edited by unibokk; 2014-09-09, 08:21 PM.

                    Comment


                    • #55
                      How many of your bikes have 36" wheels?
                      All of them, also my truck, and the baby carriage, but after reading your comments I am finally going to take the plunge!

                      No more gears for me, I am finally seeing the light, the koolaid was blinding me to my weakness, how could I be so foolish for so long.

                      But, I'm wondering how many RPM's my truck will run going 1:1 down the freeway at 60mph... but hey, if it blows I can always ride my 36er
                      I dream of hamsters and elderberries

                      Comment


                      • #56
                        Originally posted by unibokk View Post
                        Hello tholub, I've yet to ride a schlumpf geared uni but I've found that with longer cranks I can climb better.

                        If you apply the 1:0.5 ratio to a 150mm crank set, then on the lower gear you would in effect be riding with 300mm cranks but without a huge rotational axis. I reckon that setting would get get you up most hills even on a 36er

                        I wonder would it be an easy task for florian to just simply invert the current setting thus creating a new 1:0.5 approx..ratio hub??
                        Creating a downgeared hub would be different engineering; you'd have to change what part of the hub is connected to the frame and what part spins freely.

                        The good thing about a geared-up Schlumpf is that you can run longer cranks, and therefore climb better in the low gear than you could on a short-crank uni of the same wheel diameter, while still having speed.

                        And again, the people who don't get up hills off-road won't suddenly start getting up hills because they added two pounds of hub with crank slop to give them a lower effective gear. Even just having a smaller wheel (and thus lower effective gear) won't make very much difference on anything non-trivial.

                        Comment


                        • #57
                          Originally posted by tholub View Post
                          Creating a downgeared hub would be different engineering; you'd have to change what part of the hub is connected to the frame and what part spins freely.

                          The good thing about a geared-up Schlumpf is that you can run longer cranks, and therefore climb better in the low gear than you could on a short-crank uni of the same wheel diameter, while still having speed.

                          And again, the people who don't get up hills off-road won't suddenly start getting up hills because they added two pounds of hub with crank slop to give them a lower effective gear. Even just having a smaller wheel (and thus lower effective gear) won't make very much difference on anything non-trivial.

                          #But I'm guessing the internal planetary parts needn't change??

                          #Using longer cranks is fine on a 24" but on a 36" the crank length required for steep hills is prohibitive.

                          #btw... what is crank slop

                          Comment


                          • #58
                            Originally posted by unibokk View Post
                            #But I'm guessing the internal planetary parts needn't change??

                            #Using longer cranks is fine on a 24" but on a 36" the crank length required for steep hills is prohibitive.

                            #btw... what is crank slop
                            You could probably use the same planetary gears, but the sun gear, planet cage, and shifting mechanism would have to change.

                            The best way to climb steep hills is to bring a smaller, lighter wheel. Fortunately, with a Schlumpf you can do that, and then go into high gear when you want to go faster.

                            Schlumpf hubs are sloppy. You get used to it, but riding a Schlumpf always takes extra energy, and it never climbs as well as a non-Schlumpf at the same gear ratio and crank length (not even including the fact that it weighs two more pounds).

                            Comment


                            • #59
                              Originally posted by tholub View Post

                              The best way to climb steep hills is to bring a smaller, lighter wheel. Fortunately, with a Schlumpf you can do that, and then go into high gear when you want to go faster.

                              Thanks tholub, for the feedback. I have no argument with this point, but..... I wanna ride my 36er on the trails, hills n' all. I want my bread buttered on both sides. I want to have my cake and eat it. But hey! isn't that what schlumpfing is all about.

                              Comment


                              • #60
                                Originally posted by tholub View Post
                                What do you mean, you've talked about it forever. The reasons why it's a stupid idea have been covered forever as well. You want to take a uni with 2.5 extra pounds of rotating weight, and put in a hub with 2 pounds additional weight, so you can ride it in 29er mode, because you want to climb hills better? It's a completely bassackwards idea.
                                "I used to watch Highway Patrol whittlin' with my knife..." - NY

                                Comment

                                Working...
                                X