Gear-slip in Schlumpf Gen-2 hub

Yes, the "sweet spot" of the shift button is an issue, just like with
Florian's bicycle bottom brackets. It is possible to do a sorta-shift
with the button. If the button it is not fully engaged, free play can
result. And regardless of how many shift pins are in your hub. (Gen 2
have more than Gen. 1)
Pete

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Did it coast for a little bit or for more than a fraction of a rotation?

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Did it coast for a little bit or for more than a fraction of a rotation?

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Sounds more like a missed shift or a failure to engage than a gear slip.
Not the same thing as what happened to me with the Gen-1 hub, which
was a gear slip.

The Gen-2 hub was designed to keep the gears meshing together tightly
once engaged.

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You could learn how to engage the sweet spot at will and be able to
coast down hills?

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I didn't spell it wrong, you just read it wrong!

kington99 said:

A hobnob is an oaty biscuit, the fact that they don't exist in america
just goes to show that you have no culinary heritage 🙂

Quoted message said:

Quoted message said:

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Can I please see a photo of a geared uni?

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The.Mars.Volta said:

Can I please see a photo of a geared uni?

[image: http://www.schlumpf.ch/bilder/g_Einradb15.JPG]

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thejdw

I didn't spell it wrong, you just read it wrong!

kington99 said:

A hobnob is an oaty biscuit, the fact that they don't exist in america
just goes to show that you have no culinary heritage 🙂

Quoted message said:

Quoted message said:

don't follow Jesus, follow me!<<

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I -think -this happened to me a couple of times when I first got my
Schlumpf. Engaging the button was a bit hit and miss, and I'm sure
that a couple of my UPDs weren't completely my fault. However, if
you're turning the cranks at just the right speed, then the moment of
freewheeling can last for half a revolution or so.

But there certainly is a 'sweet spot' though where the cranks totally
disengage from the hub. I've only found this for sure when pushing the
button with my fingers and moving the cranks by hand when the uni is
stationary though. I would expect that the additional forces involved
when it is travelling would cause it to bounce in to one gear or the
other though.

STM

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Ken, I really can't say whether it was a gear-slip or a missed shift.
What is the difference?

On my first-generation hub, I had a very nasty splat at the top of a
hill when I tried to up-shift. The gears temporarily didn't catch, and
I fell back like a stick; the only time I've ever needed my helmet (tho
only a bit, since I bent my head upwards as I fell). That's basically
what happened this time.

So I'd guess that you'd call it a missed shift?

Semach, I don't think it's possible for the cranks to freely coast for
a half-rev. Basically the most they'll do is go thru 30 degrees (there
are 12 pins), which is a LOT less than 180 degrees of a half
revolution, tho occasionally those 30 degrees feel like a lot. A
twelfth of a rotation on a geared-up 29" uni is good for about a foot
of coasting -- but that's it. On the old hub, it didn't always engage
until the end of a sixth of a rev, which could be two feet. That was
disconcerting and caused some UPDs. But this recent slip of mine was
worse -- it didn't engage at all.

But when I picked myself and the uni up, I checked it out, and it
seemed ok; it wasn't still in slip mode.

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thejdw said:

[image: http://www.schlumpf.ch/bilder/g_Einradb15.JPG]

How does that have gears?
How does it work?
How fast can you go?
How much do they cost?

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David_Stone said:

Semach, I don't think it's possible for the cranks to freely coast for
a half-rev. Basically the most they'll do is go thru 30 degrees (there
are 12 pins), which is a LOT less than 180 degrees of a half
revolution, tho occasionally those 30 degrees feel like a lot. A
twelfth of a rotation on a geared-up 29" uni is good for about a foot
of coasting

What I meant was that if the cranks are turning slightly slower than
the wheel, then that 30' arc of non-engagement will move around with
the wheel enough for it to effectively be larger than 30'. I guess
that in theory, shifting at exactly the right moment, and keeping the
cranks in the middle of the 30' then you could keep them disengaged for
ever - but the skill/luck involved there would be incredible!

STM

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The.Mars.Volta said:

How does that have gears?
How does it work?
How fast can you go?
How much do they cost?

'GIYF' (http://tinyurl.com/33hpyx)

STM

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Thanks I didn't think of that.

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The.Mars.Volta said:

How does that have gears?
How does it work?

They're in the hub - which is why it's chunky. They use a planetary
gearing system; bicycle geared hubs work the same way. You need a
frame which can accommodate the gearing mechanism by providing a torque
arm attachment.

The shifter mechanism works by you kicking the button that sticks out
where the crank bolt usually is. Kick one side for high gear, the
other side for low gear.

Quoted message said:

How fast can you go?

The gear ratio is something like 1:1.4 (?) on the standard Schlumpf
hubs. On the KH/Schlumpf splined hubs it's going to be 1:1.5.

If you put a 1:1.5 hub on a 20" wheel it gears it up so that you get a
"virtual" wheel of 30". For a 24", you get a virtual 36" - coker size.
On a 29er (or 36er!) this would translate to something huge 😉

Schlumpf 29ers are currently reckoned to be faster than a coker on the
straight flat ground, though this varies depending on the rider.

nb: although the virtual wheel size is very big, it's still not the
same as having a real wheel that big. A 24" with 1:1.5 gearing will
behave a bit like a coker, in terms of cadence vs ground speed.
However, you don't have the large diameter and mass of the Coker wheel
there so it's still not going to be as smooth. I've not ridden a
geared uni yet but personally, I'd be very very surprised if you could
get a geared 24" to come close to a coker in terms of speedy cruising.

The cool thing would be that if one were to buy a 24" KH/Schlumpf, it'd
go *quite* fast (e.g. for less technical riding, and for getting to
muni trails), but could shift down for technical sections, natural
trials etc. Also you could probably just about manage urban trials and
street on it too: an all rounder with a particular aptitude for muni.

Quoted message said:

How much do they cost?

Lots and lots 🙁 And the KH Schlumpfs will probably cost even more.
Best to look on your local UDC to find out what they're quoting for
Schlumpfs in your local currency, but it's fairly steep at the moment.

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FWIW here, the term "sweet spot" usually refers to something nirvanic.
Like a fully engaged shift. Missing the shift means to me that the
"sweet spot" in the shift button actuation was not achieved.

In other words, what happened to Dave (and Semach and Ken and ...) was
not sweet!

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Another possible issue, this from Florian's site:

"Indeed, each SCHLUMPF gearing system (like the ones for bicycles) has
a slot screw, where you can add some drops of bicycle oil or some
special SCHLUMPF grease once or twice a year, if you want to keep
highest efficiency for many ten thousand miles."

Those of you who have had a Schlumpf for more than a year, have you
ever added any grease?

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unisk8r said:

FWIW here, the term "sweet spot" usually refers to something nirvanic.
Like a fully engaged shift. Missing the shift means to me that the
"sweet spot" in the shift button actuation was not achieved.

In other words, what happened to Dave (and Semach and Ken and ...) was
not sweet!

It should be called the [censored] spot.

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James_Potter said:

It should be called the [censored] spot.

A unique case of pedals out of position.

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The.Mars.Volta said:

How does that have gears?
How does it work?
How fast can you go?
How much do they cost?

The hub has 'epicyclic gearing'
(http://en.wikipedia.org/wiki/Epicyclic_gearing) (a.k.a. planetary
gearing). There is an animation of epicyclic gearing 'here'
(http://science.howstuffworks.com/gear7.htm) that should give you an
idea how it works.

Greg Harper made an epicyclic geared hub. You can see the project and
an inside view of the gears at the 'Greg Harper Fletcher Memorial Home'
(http://staff.washington.edu/gharper/).

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