Note: This is a wiki post, so (almost) anyone can edit.
I found myself curious about the different generations of Schlumpfs.
I compiled some notes and I’m sharing in case others have the same interest.
3/2004
Schlumpf street hub prototype
- 2 gear ratios: direct drive1:1, overdrive 1:1.5
- Shifting: direct shifting via push buttons on both ends of the spindle. No cables, no rods.
- Housing: corrosion resistant, completely encased and protected against dust and spray water.
- Hub: for 36-hole rims
- Axle length: 140mm
- Crankarms with standard square end
- Crankarms available: 104, 125, 127, 152, 165, 170, 172.5 180mm
- Distance from outer side of ball bearing to outer side of ball bearing: 102mm
- Designed for bearings with width 40mm, diameter 12mm
9/2004
Production suggested for spring 2005
12/2004
Suggesting price of $1300 USD
2/2005
Schlumpf street hub
ordering begins
8/2005
Some Schlumpf frame production issues and delays
25 of 100 were good enough, so I assume they were shipped around this time
4/2006
Kris is testing the KH/Schlumpf for muni
7/2007
Kris talks about his KH Schlumpf
The intent was to make a geared hub with ISIS spline that’s good for both on and offroad riding. Here are the some of goals we had for this hub:
-Standard 100 mm bearing spacing with flanges as widely spaced as possible,
-1:1 or 1.5:1 gear ratios
-ISIS spline axle and internals strong enough for offroad riding
-Snappier, easier shifting with improved round shifter button shape and a stronger shift rod and bash-resistant shifter system
-No requirement for a lever arm bolted to the saddle frame, replaced instead by a knurled 42 mm sleeve over the right bearing. The bearing clamp becomes the “lever arm” required for gearing- no need for bolt holes in the frame.
12/2007
KH Schlumpf price posted $1268 USD
1/2008
KH/Schlumpf Generation 1
hubs will ship in days
5/2008
Recall on planetary carrier of KH/Schlumpf hub
3/2009
KH/Schlumpf Generation 2
will have stronger bearings, slightly longer axle
2 mm longer each side to solve crank compatibility issues
7/2011
KH/Schlumpf Generation 3
adding protection rings (external dust/water guards)
reinforced rim to avoid broken spoke holes
spoke holes countersunk on both sides
PDF
10/2012
“next year’s edition (coming out summer 2013) will have more lateral clearance between body and frame to make installation easier.”
I don’t believe this actually happened
3/2016
KH/Schlumpf Generation 4
crank stops
More room between the hub body and the bearings
A new supplementary torque interface
And a neat enneagon shape
Notch for frame
2016 dimensions
- Axle and bearing spacer updates for compatibility with the External Disc Brake standard. Axle length is now identical to the Spirit, Moment and Nimbus hubs and (unlike the previous version) the bearings now have a spacer on the outside. So you can switch out geared or ungeared wheelsets without having to adjust the disc brake.
- Improved bearing durability
- Flanges are slightly thicker for more durability
- Physical block (small protruding nubs - see photo) prevents possible slippage of the knurled bearing side in the bearing housing. This requires that the bottom half of the inside edge of the bearing housing does not have a lip. All KH frames have been this way since 2012. It is an easy modification on other frames - just grind it off.
- Greater flange-frame clearance for compatibility with more frame types.
- Axle bolt hex key now increased to 8 mm to prevent stripping. The axle is now M14 instead of M12 to accommodate this.
supplement to manual
4/2016
Kris describing KH/Schlumpf generations:
First: some bearing durability issues, quite a few returns.
Second (year or so after initial release): bearing durability issues fixed. Hard to tell the difference from the First gen visually.
Third: dust cap added, bearing durability further increased. This is a fine and durable choice unless you plan to run a disc brake, in which case you’re better off with the 2016 model.
Fourth: 2016 model
M08xx is generation 4
Eric’s right - here’s a stab at the post-2020 chapter in the same format, including the quirks that turned up with the 2022 model. Corrections and additions very welcome.
2020-21
- Hubs no longer being produced - KH-Schlumpf hub wanted
- Florian looking for a partner company to continue manufacturing
12/2021
- âš™ Schlumpf hubs produced again
- Florian hasn’t sold production and will build the hubs himself, in his own workshop
- Disc-brake ready
- First hubs planned for summer 2022
3/2022
- Florian’s update: final stage ⚙ Schlumpf hubs produced again
- Disc mounting
- New pin to stop the gear spinning unintentionally
- Delayed by how complex the hub is to manufacture
- Disc-side flange sits 11.5 mm off the axle centreline - Schlumpf 2022 Build Questions - #14 by Hammer
- Wheel needs dishing, and an offset rim helps even out spoke tension
4/2022
- Frame compatibility wiki started - 📜 [Wiki] Schlumpf 2022 Hubs - Frame Compatibility ⚙️ )
- Kris: 6 mm hole rather than 8 mm - 📜 [Wiki] Schlumpf 2022 Hubs - Frame Compatibility ⚙️ - #19 by bouin-bouin - for the hub’s blocking nub
- Flansberrium frames will ship pre-drilled, older frames need drilling
6/2022
- Minimum price reported as €2800 Schlumpf 2022 Build Questions - #34 by bouin-bouin
2022
- Schlumpf 2022 Hub Order Poll ⚙️📊
- UDC UK pre-order page for the redesigned hub - https://www.unicycle.co.uk/product/schlumpf-geared-unicycle-hub-pre-order/)
11/2022
Production running, shipping expected from 2/2023 - Florian Schlumpf - Unicycle Hub
This followed a tolerance problem in final assembly that meant remaking the central axle
1/2023
- Shipping begins 28 January - Florian Schlumpf - Unicycle Hub
- Symmetric (no-brake) hubs first
- Integrated disc mount for 160, 180, 190 and 203 mm rotors
- 100 or 125 mm bearing spacing
- 36 or 32 holes
- New anti-twist protection
- Optional freewheel versions
3/2023
- Blocking nub is 6 mm, not 8 mm - Schlumpf 2022 Build Questions - #83 by mindbalance
- Some early frames were drilled to 8 mm, so Florian supplied shims
- Jakob’s alternative: drill 6-6.5 mm in the bearing cap - Schlumpf 2022 Build Questions - #95 by jaco_flans
- Spoke direction - Schlumpf 2022 Build Questions - #116 by mindbalance
- Only alternate flange holes are countersunk - spoke heads go on the flat (non-countersunk) side, with the bend coming out through the countersunk side
- Florian later said direction doesn’t matter on this hub - Schlumpf 2022 Build Questions - #159 by Becky98 - but manual was later updated to confirm the need to lace this way
4/2023
- First 100 mm hubs: spokes clash with the caliper on the disc side - Schlumpf 2022 Build Questions - #163 by toutestbon
- Rotor sits closer to the flange than the drawing (about 13 mm, not 17 mm), 180 mm rotors worst affected, 1-3 mm of spacers behind the rotor needed
- Florian: spacers behind the rotor are fine - Schlumpf 2022 Build Questions - #158 by mindbalance
- Crank install quirks - Schlumpf 2022 Build Questions - #146 by mindbalance
- Axle bolt rounding reported while seating cranks, manual torque is 45-55 Nm
- Crank stops are “pressure rings” to protect the bearings, so a gap to the crank at spec torque is expected
- Florian: bolt is very hard, 55 Nm is fine Schlumpf 2022 Build Questions - #158 by mindbalance
- Kris Holm responds - Schlumpf 2022 Build Questions - #191 by danger_uni
- Assembly instructions to be updated
- Spacers (1x1 or 2x1 mm, unlikely more than 3x1 mm) to ship with hubs
- Flange spacing about 2 mm wider than most hubs, so frames may need slight filing, KH frames should clear
- 203 mm rotors recommended
- Florian: hub body modified for 2 mm more clearance on future hubs- Schlumpf 2022 Build Questions - #194 by gmerick
- Non-disc flange doesn’t move - Schlumpf 2022 Build Questions - #197 by rogeratunicycledotcom
- Spacer rings (1, 2, 3 mm) and the first 125 mm hubs - Florian Schlumpf - Unicycle Hub
5/2023
- Florian Schlumpf - Unicycle Hub
- Housings give 2 mm more disc clearance, countersunk disc screws
2023
From - đź“ś [Wiki] Schlumpf hub serial numbers reference
- On-hub disc compatibility
- 6 mm circular bearing stop
- About 1650 g
From - KH 2023 model - Kh Schlumpf | Kris Holm Unicycles
- Needs a left-side frame disc mount and only works with Schlumpf’s own rotors
7/2023
-
Supplied rotor reported to bend easily and brake poorly - Schlumpf 2022 Build Questions - #312 by unicycleharry
-
BrakeStuff making prototype rotors for the new hubs - BrakeStuff Rotors for Schlumpf - Who’s Interested?
-
Swept 203 and 220 mm designs discussed
Fall 2024
- Production of disc hub at full speed again - Florian Schlumpf - Unicycle Hub - Non-disc version available again also (2015 version)
12/2025
- Jakob Flansberry starts training with Schlumpf - Florian Schlumpf - Unicycle Hub to help with service and repairs
2026
- Florian making the last gear hubs - Florian Schlumpf - Unicycle Hub
- Both non-disc and disc models, 125 mm option, ordering by email
