What is Kindernay?

Kindernay is our brand and registered trademark. K’ay and K are short for Kindernay, pronounced “K”.
Kindernay Corporation is a Norwegian limited liability corporation that develops, makes, and markets advanced internal gear systems.

Kindernay XIV is our product: the lightest, and most versatile, and advanced full range internal gear system.

In roman numerals, XIV denotes the number 14 (fourteen). X is 10, I is 1, V is 5. IV is “1 less than 5” = 4. XIV = 14.

Kindernay HYSEQ is another one of our products, a simple and durable, low-maintenance, low-weight, direct feedback shifter, for shifting two-way Kindernay gear systems.

HYSEQ is short for “hydraulic and sequential”.

Kindernay SWAP is another one of our products, a new and innovative detachable wheel system, for ease of tyre and rim swap.

Just like other components on the bike that are actually two different parts that can be put together, SWAP makes the gearbox and fully laced wheel detachable from each other.

Hence, the wheel and the gearbox may be removed and changed for another. You may change to different rim diameter (29”, 650, 26”), different width, material (carbon/alu), or different purpose rim / wheel (training/competitive).

Product information XIV

The Kindernay XIV has 14 speeds, with even steps of 13.9% (XIV=14).
This gives a total range is 543%, which is greater than normal external gear systems of today, for example a 2×11 system with 38/11 in the hardest gear and 26/42 in the lightest would have 511%, and there the narrow chain also has to bend all over the place.

For the techies:
1*1,139*1,139*… etc how many times?
1*1,139^13 = how much?
why 13 and not 14? 🙂

The Kindernay XIV is the first and only multispeed gear hub that is compatible with a full-length 12mm (or 10mm) through-axle, via a full-length tunnel stretching from side to side.
Clutches with 24 engagement points give rapid pedal engagement, and clutches with large diameter allow high torque, and instant / rapid pedal engagement, no pedal slack or spongy feeling in the pedals. The clutches can handle DH, freeride, and e-bike at max torque.

Shift through the whole gear range, without even turning the pedals.

…and alot more, you gotta try it.

The Kindernay XIV hubgear is designed to withstand the rigors of mountainbiking. It is designed to handle a nominal torque of 150Nm on the hub and a chain tension of 3000N, though the maximum peak torque capacity is higher.

A good general guideline to cog sizes would be as follows: The minimum sprocket that the hub can handle is 13T, however riders expecting to use the hub up to its upper torque capacity should use larger sprockets, preferable 15T or larger to avoid overload and premature wear both on the hub and crank bearings and the drive line itself. The crank/hub sprocket ratio should be chosen in the range of 1.9 to 3.0.

Use rear hub sprockets that are compatible with Shimano DX/DXR.
Cogs no thicker than 2.3mm.

The Kindernay XIV is the lightest full-range internal gear system on the market.
XIV gearhub raw weight (approx): 1400 grams
HYSEQ shifter raw weight (approx): 365 grams (actuator, cables, right and left operators)
SWAP wheel shell weight (approx): 101 grams
+ some peripheral components depending on frame setup

Total system weight for the standard (135/142/148mm) version is approx. 1960g.
In order to compare that with a derailleur setup, one must add the weights of  the following parts:
Derailleur(s), shifters(s), shifter cables and housing, cassette and rear hub.

Kindernay XIV fits on frames with rear spacing 135mm with a 5mm quick release or 10mm axle, 142mm spacing and a 12mm axle, 148mm boost, 190mm spacing and a 10mm axle or 197 spacing and a 12mm axle. 170mm/177mm x 12 is in the works.

You’ll need a HYSEQ trigger shifter.
The current system is not compatible with integrated drop bar shifters.

The Kindernay XIV is available in 135/10, 142/12, 148/12, 190/10 or 197/12 axle spacings.

Note that the hub can be easily converted between the 135-142-148 standards and between the 190 and 197 standards, by using the conversion kits that we have available

The Kindernay XIV comes with a custom brake disc, in either 173 or 193mm:

The custom 173mm disc is for bikes with 160mm stock, and put 193mm is for bikes with 180mm stock. Some bikes come with 203mm stock, but they usually have an adapter/spacer, so by removing that adapter, our 190mm disc works great.

The extra 13mm diameter of the Kindernay specific rotors comes from the extra height that the custom caliper mount/torque reaction bracket adds to the mounting point of the caliper.

135/142/148mm versions  : 48.5mm
190/197mm version            : 76.0mm

Some form of chain tensioning is neccessary, for example:

  • Frame with sliding dropouts
  • Eccentric bottom bracket
  • Single pulley chain tensioner (OK for hardtail frames)
  • Dual pulley chain tensioner (required for most full suspension frames, and will work great on hardtails too. In fact, it is often easier to get a clean install with a dual pulley tensioner, as it can be tucked closer to the chainstay than is the case with a single pulley tensioner.)

Upshift: It is possible to upshift (to a higher/heavier gear) under close to full pedal power.
Downshifts: It is possible to downshift (to a lower/easier gear) under load, but the rider must slightly reduce the load on the pedals during the shift.

The SWAP shell/cage is currently available in 28h only, but we are working on a 32h version as well.
Fatbike version is 32h.

Note: Due to the short spokes (due to 100mm hub flanges) and symmetric build of the wheel (ie. spoke lengths and spoke tension is equal on both sides), our 28h wheels are often stronger than a traditional 32h wheel.

In general: a single speed setup usually have an efficiency of around 97%, while a typical derailleur system will be at around 96% efficiency, since the chain has to go through the pulleys of the derailleur cage. Note that clutched (1X) derailleurs have slightly lower efficiency due to the higher spring rate required.

Internal gear hubs will range from low 80%  up to approx. 95% for the most efficient internal gear hubs. We will have official efficiency data for the Kindernay XIV when our own in-house dyno is ready; we are working on designing and building our own dyno for efficiency testing.

However, from a theoretical point of view, due to the internal layout and (low) number of interfering cogs, etc. it should be as efficient or more efficient than any other IGH on the market. Feedback from Kindernay customers who own several types of IGHs confirm that.

The Kindernay XIV comes with a 2 year warranty against manufacturing defects. 

The Kindernay Warranty Policy can be found here.

The Kindernay XIV is built to withstand very high loads. However, we do not yet recommend it for expedition use, as we currently only offer SWAP shells with 28 spokes, and the hub shell is sealed, so service in the field is not possible.

Pretty much any 5-speed to 11-speed chain can be used.
It is likely that some single speed chains as well, but note that some of them are too wide

It will likely start shipping in March / April 2020

  • Extra SWAP shell(s) for use on multiple bikes or wheelsets
  • Extra cogs
  • Chain tensioner
  • Extra brake rotors
  • Gear oil (we use a special formulation, custom made for the hub)

For best performance and longevity, we recommend that you use our specially formulated  Kindernay oil. The hub is delivered with oil (shipped in a bottle due to shipping regulations)

Recommended (hub) oil change interval is 5000km or 1 year, and we also recommend an initial oil change after 500km to flush out particles, etc. from break-in.

We sell oil change kits that consist of flushing/cleaning oil and lubricating oil. 

Three different oil change kits are available

Belt drive is possible. As of now, there is one Gates cog that will fit, the 22T so called 6 bolt cog:

                Gates Carbon drive

Note that we are now cooperating with Gates in order to develop more cog sizes that will work with our hub. 
Note: The beltline with the above Gates cog is 45.5mm

Determining the proper front ring size with a Gates system is a little more complicated than in the case with a regular chain, since there is a difference in pitch, ie. the tooth count of the cogs can’t directly compare to those of a chainring.

However, here is a way to do it:

The pitch of the Gates system is 11mm, and that of a regular chain/cog is 1/2’=12.7mm

In other words, the ratio of the Gates pitch vs. chainring pitch is approx. 1.15:1, so the 22T Gates should equal a ”19T” regular (chaindrive) cog.

Such a 19T drive cog would mean that the XIV would have the ratios of a 14 speed 13-70T cassette (as you can see in the chart above)

Use that info to find the chainring that you would run with a 13-70T cassette, and divide that chainring size by 19T

This gives you the proper front/rear cog ratio, and that is unaffected by means of power transfer (belt vs. chain).

The number that you get, you will multiply with the 22T size of the gates cog, and you should have your front Gates cog size.

Let us know if you need any assistance with that calculation

What you will need to run a Gates system would  be the rear cog, belt and front ring.

In addition, you must have a frame with a rear triangle that splits, in order to insert the belt. 

Plus: some way to tension the belt, ie- sliding dropouts of eccentric bottom bracket.

What you need is:

Two plastic syringes and two short sections of thin plastic hose.

Note that the system is delivered pre-bled, so no need to bleed unless you want to cut/shorten the hoses.

We are getting many requests for this, so we might consider making a 31.8mm clamp so that the levers can mount on top of the bars.

Our own clamp is currently limited to the MTB handlebar standard of 22.2mm, but Paul Components in the USA makes such a 31.8mm clamp for SRAM triggers. 

Some slight modifications to these clamps, and they will likely work with the Kindernay triggers as well. Note: these would preferably be combined with a drop bar with a fairly wide 31.8mm section, so that the shifters can be placed sufficiently far apart so that the hydraulic hoses will not interfere with each other.

It is possible to use Kindernay XIV on a Brompton, but it requires a custom rear frame triangle from Kinetics. 

With the hub internals in a sealed oil bath, there is very little wear on the these components, so the need for replacing planetary gears, etc is practically non-existent, even after very extended use.

The internals are not user serviceable, but like a gearbox in a car, replacement of these components is not common.

The (external) drive cog is a standard Shimano DX type, and is available from virtually any bike shop, typically at a cost of less than $10.

The only scheduled maintenance is an oil change every 5000km (3100 miles) or once a year, whatever comes first.

Do NOT use a pressure washer, and if you use a garden hose, avoid directing the spray at the bearings/seals, as water will get into the internals. Also, do not use any chemicals harsher than soapy water.

The Kindernay torque reaction bracket is made to mount on a disc brake frame, but there are adapters out there that might work: https://www.wiggle.co.uk/a2z-universal-disc-mount/

The Kindernay XIV will bolt onto most standard frames on the market. Note that on some bikes, some simple modifications to the torque arm and/or torque reaction bracket might be necessary. 

The Kindernay can be fitted to pretty much any normal 135mm frame, the 135/10 option is in fact one

 of the most common ones that we sell.

Note that the hub can easily be converted from 135/10 to 142/12 or 148/12 at a later stage.

The 135/10 hub is shipped with a 10mm through axle that creates a perfect fit in a standard 135 frame that normally uses 5mm QR.

Here is a picture of that through axle that we include for the traditional MTB frames:

With the above through axle, the frame rests on the 10mm thru axle rather than on the 10mm endcap tabs of a traditional hub.

A major advantage is that we achieve much higher stiffness with the 10mm TA vs. the old 5mm QR, but with the QR function of the TA and the open dropouts of the (traditional 135mm) frame, wheel changes are just as fast as before

The drive cog on the Kindernay XIV hub is a standard Shimano DX type.                                                 Available from most bike shops.

To remove the cog, you will need to use a chain whip and a 38mm socket.                                         Note: grind down the outer flange of the socket somewhat, so that it is flat and provides more overlap and a better grip on the locknut.We will offer a special 38mm tool later, but a slightly modified socket 38mm socket works extremely well.

Possible in the future, but no immediate plans.

Not likely, due to very few requests

Planned launch in mid 2020.

Possible, but no immediate plans

Not likely, due to very few requests.

It will stand up to tandem levels of torque,  but note that the SWAP shell is currently limited to 28h. (32h planned for 2020)

Not likely, due to very few requests.

The numerical ratios from 1 through 14 is as follows:

1: 0.272
2: 0.309
3: 0.353
4: 0.402
5: 0.458
6: 0.521
7: 0.594
8: 0.676
9: 0.770
10: 0.878
11: 1.000
12: 1.138
13: 1.297
14: 1.477 

Total range/span is 543 % 


Below is a chart that shows the ”virtual cassette” ratios of the XIV with cogs ranging from 14T to 22T and compared to SRAM Eagle 10-50 and Shimano 10-51 and 10-45.

As we can see, with a 14T cog, the XIV is the equivalent of a virtual 14 speed (9.5T-51.4T) cassette, ie. both higher and lower ratios than any cassette, and shorter gaps between the gears due to 14 speed vs. 12speed.

The HYSEQ shifters use mineral oil. Do not, under any circumstance, use DOT fluid, as it will damage the seals and void the warranty.

The Kindernay XIV hub uses straight cut gears in order to ensure its substantial torque handling capability and high efficiency. This is the sort of gears that are used in gearboxes in most racing cars. As is the case in a racing car gearbox, these gears exhibit a somewhat higher sound level than traditional, helical cut gears.

All oil lubricated internal gear hubs will sweat a small amount of oil through the oil seals due to variations in temperature and resulting pressure differences.                                                               In order to minimize oil loss, it is a good idea to store the bike as upright as possible, as this will prevent oil from collecting over one of the seals. If the bike is transported laying on its side, return it to an upright position as soon as possible, and be aware that some oil might drip from the hub when it is laying on its side.

Yes you can, but because of the lower air pressure, you should drain the gear oil into a suitable container (for example a small plastic bottle) before boarding. Refill the hub when you reach your desitination.

The Kindernay XIV is hydraulically activated for many of the same reasons that performance braking systems on bicycles, motorcycles and cars are hydraulic, and not cable operated.

The hydraulic system is sealed against the elements, and not affected by corrosion, mud, sand, etc, ensuring a consistent level of performance over time.

With mineral oil as the hydraulic fluid, virtually no maintenance is required.

Hydraulics make cable routing much easier, as hydraulic cables can be routed through tight bends, etc. without affecting performance, unlike steel cables, which see a significant rise in friction and wear rate, if routed through a tight bend.

Hydraulic hoses and oil is significantly lighter than traditional steel shifter cables and housing. Last, but not least, the hydraulic setup is able to transfer much more force than a cable operated system, this allows the Kindernay XIV to shift gears under much higher load than would be possible with a cable operated system.

General technical questions

The gear mechanisms of internal gear systems are packed up inside a metal casing.
The inner mechanisms are therefore less likely to be influenced by anything happening outside the casing. Mud, dust, dirt, branches, rocks, shaking, and jolts won’t mess things up easily.

In principle, internal gear systems are more robust than external gear systems are. They also require less maintenance.

Here at K’ay, we believe more in the use of internal gears than external gears in sports such as motocross and most types of mountain biking.

Most internal gear systems are of the “planetary gear” type, you may read more about this type of gear system bellow.

True, most internal gear hubs are made to handle only city biking.
But not this one. The Kindernay XIV is tough and ready, designed to handle rough mountainbiking: enduro, freeride, DH, and trail riding.

‘Planetary gears’, or an ‘epicyclic gear train’ is a type of mechanical system with cogged wheels that run within each other.
An epicyclical gear train can be imagined by picturing the solar system.
In the center of the system is a sun. Surrounding the sun are planets, that revolve around the sun.

In an empicycical gear train, there is also a sentral sun, in the shape of a cogged “sun gear” with outwards pointing gear teeth. Surrounding the sun gear are cogged “planet gears”, with outwards pointing gear teeth, that mesh with the gear teeth of the sun gear. These planet gears are held in place relative to each other by a “planet carrier”.

By locking the planet carrier to the sun gear, the system will revolve with the same speed. Now, by releasing the carrier from the sun gear, the planet gears begin to roll around the sun gear. Thus, the system provides two different speeds. First there’s a 1-1 speed, where the sun and planet rotate at the same velocity. Second, there’s a speed where the sun and planet carrier have different velocities, yet always the same ratio in between the two.

A more complex planetary gear has also a cogged outer ring, called an “annular gear”, with gear teeth pointing inwards. The annular gear teeth mesh with the planets, so that the planets mesh not only with the sun gear in the center, but also with the annular gear outwards.

Such a planetary series, with a sun gear, planetary gears held together by a carrier, and an annular outer gear, can yields multiple useful speeds.


We ship by DHL Worldwide Express.

The shipment is fully insured and tracked.

The Kindernay XIV comes with a 2 year warranty against manufacturing defects. 

The Kindernay Warranty Policy can be found here.

  • The Kindernay XIV is to be installed by a skilled bicycle mechanic.                                                 
  • Tightening torque for the seven M4 (SWAP cage to shell) bolts is 2.5Nm.
  • The HYSEQ shifter unit uses Mineral oil. Using DOT fluid will void the warranty.
  • The torque limit is 150Nm. Torque levels above this limit will void the warranty.
  • The ratio between the drive sprocket and the front chainring must be 1.9 or bigger. For example, with the stock 14T drive cog, the minimum front chainring size is 27T.
  •  Make sure the uncaged hub is never dropped, as there is a risk of the shell separating.
  • Always use a new chain when installing the hub, as a used chain might cause skipping.
This product is guaranteed against manufacturing defects for two (2) years from the original date of purchase.  This warranty does not cover damage or failure resulting from misuse, abuse, alteration, neglect, normal and reasonable wear and tear, crash or impact, failure to perform routine maintenance as instructed, improper installation, or use other than that for which the product was intended. Kindernay’s sole obligation in the event of such defects during this period is to repair or replace the defective part or product with a comparable part or product at Kindernay’s sole discretion. Except for such replacement, the sale, or other handling of this product is without warranty, condition or other liability even though the defect or loss is caused by negligence or other fault. Kindernay assumes no liability for any accident, injury, death, loss, or other claim related to or resulting from the use of this product. In no event shall Kindernay be liable for incidental or consequential damages related to or resulting from the use of this product or any of its parts.

Our technologies are protected with patents that have been granted in several jurisdictions.
We’ve also registered designs and trademarks.

Yes, just go to our online store and start the ordering process, we’ll help you out and make sure all is correct when the order is received. 

Just go to our online shop and make the order! You can always access the online store though the Buy Now button in the main menu.

Other Question?

Go to the contact page, drop us an email and we’ll be happy to answer.

Developed in Norway, Made in Europe

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