Purchasing Schlumpf Unicycle.

I'm gonna get the 28" model too. I have no reservations about it, I
simply pointed out that a 28/29" wheel (i.e. 700c rim) is as big a rim
as I'd care to mount the hub to.

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I think it would work OK with a 700c rim. It's not ideal, but should be
OK. You might have a problem if you run a brake because the narrow hub
will make the wheel more flexy which could allow the rim to rub the
brake pads. For road riding and cruising it should be fine. If you do
want to run a brake then you might end up needing to fuss with the wheel
build to make sure it's as good as possible and fuss with the brake to
make sure the pads retract from the rim as far as possible. But that's
just speculation right now. Till someone actually builds one with a
700c wheel and finds out through experience whether the wheel is too
flexy to work well with a brake. Using a good strong and stiff rim
should minimize the issues.

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unisk8r said:

I'm gonna get the 28" model too. I have no reservations about it, I
simply pointed out that a 28/29" wheel (i.e. 700c rim) is as big a rim
as I'd care to mount the hub to.

1. Who else have already ordered a Schlumpf geared uni? What wheel
size?

2. Has the Schlumpf uni been given a colloquial name yet? I read about
"shifty". Lame if you ask me.

Based in part on the posts with positive experiences gained during
Florian's USA tour, I'm strongly considering to order a 28" (actually
29" with Big Apple). I was in doubt whether I'd want to wait for a 36"
version but reading about the narrow hub and the possibility that a
wider hub may be made at some point, I think 28" is the better option
now. The next doubting point is crank length - input welcome. (I
prefer 125 mm on a 1:1 29".)

In the other Schlumpf thread Gizmoduck asked about service life. The
Schlumpf website's heartening prose about this:

"Durability: - The unicycle hub is made similar to our bicycle gearing
systems. They have a life expectance of at least 50'000km without
weared out parts. You can expect a very high quality of all gears,
bearings and shifting parts."

and:

"Maintenance: - After assembly, we lubricate with a special grease,
good for many thousand miles.
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."

and:

"Warranty: - 5 years for perfect function"

Sounds good enough to me.

Klaas Bil - Newsgroup Addict
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Klaas Bil said:

*Schlumpf website's heartening prose about this:

"Durability: - The unicycle hub is made similar to our bicycle
gearing
systems. They have a life expectance of at least 50'000km without
weared out parts. You can expect a very high quality of all gears,
bearings and shifting parts."

and:

"Maintenance: - After assembly, we lubricate with a special grease,
good for many thousand miles.
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."

and:

"Warranty: - 5 years for perfect function"

Sounds good enough to me.

Klaas Bil - Newsgroup Addict*

Wow that makes me all the more want to get one of them. I think it would
be realy cool to have.

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john_childs said:

*You might have a problem if you run a brake*

Schlumpf offer an optional brake off-factory so at least they have
confidence that it will work.

Klaas Bil

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john_childs said:

*I think it would work OK with a 700c rim. It's not ideal, but should
be OK. You might have a problem if you run a brake because the narrow
hub will make the wheel more flexy which could allow the rim to rub
the brake pads. For road riding and cruising it should be fine. If
you do want to run a brake then you might end up needing to fuss with
the wheel build to make sure it's as good as possible and fuss with
the brake to make sure the pads retract from the rim as far as
possible. But that's just speculation right now. Till someone
actually builds one with a 700c wheel and finds out through experience
whether the wheel is too flexy to work well with a brake. Using a
good strong and stiff rim should minimize the issues. *

I reckon it should be fine for a 700c rim, and maybe a well built Coker.
After all, my Coker had a narrow Suzue hub on it before and it worked
fine for me (60kg). I don't know how much narrower the Schlumpf is
compared to a Suzue though. It might be worth seeing if a disc brake
tabs could be fitted if you're worried about wheel flex causing the
wheel to rub on rim brakes.

How many spokes are in the Schulmpf? 36? That would basically get you
a touring or 29" MTB rim, which should be plenty strong. My new Road
Bike which I'm getting tomorrow (2004 Cervelo Super Prodigy) only has 16
spokes/wheel :p

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GizmoDuck said:

*I reckon it should be fine for a 700c rim, and maybe a well built
Coker. After all, my Coker had a narrow Suzue hub on it before and it
worked fine for me (60kg). I don't know how much narrower the
Schlumpf is compared to a Suzue though. It might be worth seeing if a
disc brake tabs could be fitted if you're worried about wheel flex
causing the wheel to rub on rim brakes.

How many spokes are in the Schulmpf? 36? That would basically get
you a touring or 29" MTB rim, which should be plenty strong. My new
Road Bike which I'm getting tomorrow (2004 Cervelo Super Prodigy) only
has 16 spokes/wheel :p *

There are specs for the hub on the Schlumpf Innovations web page:
http://www.schlumpf.ch/uni_engl.htm
It has 36 spoke holes.

I'm thinking in terms of ultimate wheel strength. A wheel built with a
narrower hub isn't going to be as strong as one built with a wider hub.
That becomes more important the larger the wheel is.

There have been Coker wheels built with the Suzue hub and other narrow
hubs. With the Airfoil rim it's an adequate wheel. Just not as strong
or as stiff as it could be. The flex would only be a problem with a rim
brake. But the flex would also lead to premature spoke failure due to
the flex putting more stresses on the spokes.

It may be possible to custom machine an adapter to fit a disk brake on
the hub. The hub is designed so that it can be taken apart. On one
side of the hub is an access plate held on with about 10 screws. When
you remove the screws and plate you can access the guts of the hub to do
servicing. You could design a disk rotor mount that would bolt on over
that access plate. That just might work.

A Coker wheel with that hub would work. I wouldn't let the narrow hub
prevent you from doing it if you really wanted a geared up Coker wheel.
Just be aware of the limitations.

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Loads of people have big apples on suzue hubs without problems, even in
very tight clearance frames, which suggests that the flex is minimal if
you have a well built wheel. I know I've never had tyre rub on my 29er.
If you do 5 foot sidehop drops on a 29er you might want a wider hub.
However you'd probably want a stronger rim than a 29er rim too and would
probably be best off with a 26" or 24" wheel.

Agree that on a coker, if you wanted to fit a brake you'd need to be
pretty careful about truing the wheel nice and tight.

I'm really tempted by this, but I just don't really have the money spare
right now. Grr. I'm hoping someone will get one to bring to the British
Unicycle Convention or something so I can play on it.

Joe

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Klaas Bil said:

*1. Who else have already ordered a Schlumpf geared uni? What wheel
size?*

Schlumpf said that there are 30 people that have pre-ordered them.

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What's the chance of just buying the hub so you can build a 36 incher
around it?

JL

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You can't buy just the hub because it requires a special modified frame.
I guess Mr Schlumpf doesn't want to sell it on it's own because a badly
built frame could make the hub not work so well, or break.

Joe

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joemarshall said:

*
I'm really tempted by this, but I just don't really have the money
spare right now. Grr. I'm hoping someone will get one to bring to the
British Unicycle Convention or something so I can play on it.

Joe *

...ideally the 29er variant.

Until this week I wasn't too tempted, however, after reading "Florian
Schlumpf in Seattle" thread and seeing the videos of the mechanism, the
on the fly shifting, the engineering, the positive comments, the.... I
suppose I will need to start saving, and working out an excuse for the
other half, Coker speeds without taking over the car boot (trunk) on
holidays probably won't be acceptable.

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Klaas Bil said:

2. Has the Schlumpf uni been given a colloquial name yet? I read
about
"shifty". Lame if you ask me.

It's Schluni of course!

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keg said:

*
Until this week I wasn't too tempted, however, after reading "Florian
Schlumpf in Seattle" thread and seeing the videos of the mechanism,
the on the fly shifting, the engineering, the positive comments,
the.... I suppose I will need to start saving, and working out an
excuse for the other half, Coker speeds without taking over the car
boot (trunk) on holidays probably won't be acceptable. *

That's one of the reasons this forum is so cool and useful. You can find
out so much about what's going on in the global unicycling community.

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