Do you like this website? Help us do better.

At road.cc, every product is thoroughly tested, as long as you need to understand its working conditions correctly. Our reviewers are experienced cyclists and we believe they are objective. Although we strive to ensure that the opinions expressed are supported by facts, the comments are essentially an informed opinion, not a final ruling. We will not deliberately try to destroy anything (except locks), but we do try to find any weaknesses in the design. The total score is not just the average of the other scores: it reflects the function and value of the product-the value depends on how the product compares with items of similar specifications, quality, and price.

Good grades are more common than bad, because fortunately good products are more common than bad.

The Kasai FS wheel hub quick release 6-bolt disc is a low-cost, field-repairable (to a certain extent) entry into the world of generator power. Provides a series of axle types, number of spokes, brake type options and colors, which is a good choice for ultra-wilderness or related riders.

Taiwan’s Kasai is well-known for its Dynacoil hubs, but almost the entire series is factory sealed. This means that if they stop working or need a new bearing, that is to untie it from your wheel and send it back to Kasai-a pain to say the least. If you are in a remote place during a long bike tour, your trip may be over.

> Buy online here

Dynamo hubs fail for many reasons, but the main reason must be immersion in water. When you are riding a bicycle, it may be inevitable or accidental. Dirty water and "leccy" will not mix. However, anyone who has made a phone call or spilled tea on a laptop knows that electronic products can be brought back to life with large amounts of drying, rice, and fume hoods... But these things are sadly in short supply in many remote places.

In order to do this, you need to disassemble the wheel hub, which is where FS (Field Repairable) comes in. However, you do need to carry a 30mm wrench. Obviously a flat wrench designed for it (thankfully still common) is a threaded headset; a normal 30mm wrench is not small or light. And make it high in quality. Although it is very easy to disassemble this hub, it is also very strict when it leaves the factory.

Please remember to unscrew the disc side end cap first, otherwise you will conflict with the shaft thread, which may cause destructive consequences.

After removing the 30 mm nut, you will see the exposed coil of the generator-at this time you can clean/dry as needed.

There are many styles of FS hubs: black or silver, disc or rim brake, QR or thru-shaft, and 32 or 36 spokes. Please note that the through-shaft version requires a 36 mm wrench because the shaft is thicker (15 mm shaft is required, or 12 mm with adapters). You will also need a dedicated 17 mm drive tube tool and a hammer to disassemble the components.

The through-shaft boosted fork (110 mm pitch) requires a conversion kit worth 22.76 pounds to properly space the hub and disc rotor.

The rotor side bearing-the conventional 6000RS bearing on the QR shaft version we have here-is easy to replace. However, you cannot change the other bearing of the generator itself because it is buried in the coil and the electrical contacts pass through it. If this bearing fails, it is the job of the factory, although it is at least exposed to dust and water less than the disc-side bearing.

Or, Kasai sells the entire generator assembly (including bearings) for £82. If the generator at work is absolutely mission-critical, you can carry a relatively small 340g backup generator.

> 26 best bicycle backpacks-how to choose a lightweight suitcase

The FS hub is very easy to build around the wheel because the spokes on both sides are the same length, and detailed and accurate technical documentation is available. I installed it effortlessly into the 45mm wide, 650b WTB Scraper rim of my bicycle packaging machine.

Plastic connectors are easy to install, and if you happen to pull the wires off—such as a stick sandwiched between a wheel and a fork blade—the wires are easy to peel off and reinstall in the connector without soldering.

Kasai said that the FS wheel achieves an efficiency of 72% at a speed of 16kph/10mph, which I think is a good average for bicycle travel. Under the nominal 6V/3W output, this is 2.16W. This provides your AC-DC converter with 0.36 amps of current, which in turn provides you with USB charging-let's face it, this is what most people want. Using a digital USB charging dongle to measure the current output, I am very close to that number.

I plugged the Kasai hub into a 75 Euro Cycle2Charge USB converter and it outputs 500-1000mAh between 12 to 21kph (7.5 to 13.1mph).

As the speed changes, many changes occur between the hub, converter, and battery, so the easiest way is to see the actual results. After riding for more than two hours at an average speed of 10 mph (490 meters climb over 36 kilometers) on my 3-inch 650B tires, I charged the battery pack with 1,000 mAh. Therefore, after 8 to 10 hours of riding at 10 mph in a day, you might even fill up a lot of money for the phone/bike computer/fairy lamp at night.

In other rides throughout the summer, the results are almost in line with the average of 500mAh per hour.

Of course, it will not do well on hilly terrain, because you will hardly use a pack of wrenches and hammers to charge on a long mountain at a speed of three or four miles per hour, and the booster you come down from the other side is premature End, unless you are braking to maximize it. In general, the Kasai FS hub has done the job, and during the field trip, I never fell into the literal or figurative darkness.

> The 19 best gravel bikes and adventure road bikes of 2021

After several good long dunks, which caused deep burns to my calves, I opened the hub and found that there was no moisture in it. This is not to say that it is 100% leak-proof-it is to say that there will be no traces after a few days. I think the wheels will warm up slightly over time, which helps evaporate and drain water.

I don't know of any other "field repairable" generator hubs on the market, so the price of Kasai FS is £155. You can buy a non-repairable QR generator hub from companies such as Panasonic for approximately £80, while the industry-leading SON hub will cost you approximately £250.

It weighs 480 grams, but only 40 grams heavier than the irreparable SON 28.

Although one of the two bearings is still inaccessible, the ability to pack and ship it for maintenance and repair without having to unravel it from the wheel can be very valuable. In fact, it is unique among these hubs. If you really want to experience the atmosphere of the zombie apocalypse, bringing your own spare coil assembly is the ultimate solution.

For just £155, Kasai has created an excellent choice for you to use the amplifier to your heart's content.

Repairable by the owner, ideal for long-distance travel or long-term, low-cost generator hub ownership

If you are considering using a cashback transaction to purchase this product, why not use the road.cc Top Cashback page and get some of the highest cashbacks while helping to support your favorite independent bicycle website

Brand and model: Kasai FS Hub Quick Release 6-Bolt Disc

Test size: 26 inches to 700 inches

Tell us the purpose of the product and the target audience. What is the manufacturer's comment on this? How does this compare to your own feelings?

It is suitable for people who want ultimate reusability and/or cost-effective ownership in remote areas.

Kasai said: "Standard Kasai Dynacoil wheels like SON and SP cannot be repaired by dealers or consumers. They are sealed at the factory. Dynamo wheels can fail in some cases, usually due to water pollution. If on site If this happens, you can’t fix it. If it happens in a store or at home, you still need to cut the wheel from the wheel and ship it to the factory with a dime, and then wait for them to fix it.

"FS Dynacoil has a detachable coil assembly that can be taken out with a 36mm headphone wrench. The coil can be replaced, including the plug, without tearing off the spokes. Most importantly, it can be done on site, so FS (field repairable). "

Tell us more about the technical aspects of the product?

Lightweight and efficient power generation. Achieve 72% efficiency at 10 miles per hour.

– Compatible with wheels from 26in to 700c

Will the work be charged over time, but not as good as the best hub.

I think the connector can be stronger, but it did not disappoint me. The rest felt very difficult and survived many rough assaults off-road.

Nearly half a kilo is not light, but it is a unique design. It is 40 grams heavier than SON 28 QR.

Its price is 155 pounds, which is about twice the price of the cheapest well-known wheel, but they do not require wheel modification, postage and repair costs. It is also cheaper than other famous bicycle generators, and they can only be repaired in the factory.

Tell us how the product performs as a whole when used for its design purpose

Continue the truck, and did not stop. Can't blame it.

Tell us which aspects of this product you particularly like

Easy to disassemble and assemble into a wheel.

Tell us what aspects of the product you particularly dislike

The initial challenge to let it loose.

How does the price compare to similar products on the market (including those tested recently on road.cc)?

Since it is clearly the only generator on the market that can be repaired by the user, this is a tricky problem. But even compared to non-repairable hubs, its price is reasonable.

Do you like to use this product? Yes

Would you consider buying this product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your total score

The power output at low speeds is not the best, but if you value maintainability, then this is a good choice in terms of price.

Age: 47 Height: 183cm Weight: 77kg

I usually ride: Sonder Camino Gravelaxe. My best bike is: Nah bro. That’s it

I have been riding: for more than 20 years I have been riding: a few times a week I classify myself as: expert

I often do the following types of cycling: cross-country bikes, general fitness cycling, mountain bikes, GRAVEL

We noticed that you are using an ad blocker. If you like road.cc but don't like ads, please consider subscribing to the site to directly support us. As a subscriber, you can read road.cc without ads for only £1.99. 

If you don’t want to subscribe, please turn off the ad blocker. Advertising revenue helps fund our website.

If you like this article, please consider subscribing to road.cc for as low as £1.99. Our mission is to provide you with all news, independent reviews, unbiased buying advice, etc. related to you as a cyclist. Your subscription will help us do more.

I think the nomination is selected by a panel of sports reporters; the Olympics is the definition of cycling with them; this means track and field competitions...

Interestingly, my height is still about the same-due to age and weight of responsibility, I may be shorter. ...

I agree that they have failed to achieve their goals in many ways. I'm not even sure that they have done a good job of "raising the issue of national consciousness." for what...

Consultation-mixed good and bad. When it is clear that a decision has been made and will not change, this often seems like a tick exercise...

This is too simple... so #1 Obviously, if there is no motor, #2 will never reach 25kph in the beginning, and #2 exceeds the limit? Dangerously fast! ...

I think the road looks familiar and I'm not surprised by this behavior, cars are always there in a hurry and never like to slow down unless...

I'm sure I have sent a thank-you letter before. I also ordered a rotor parking tool as a Christmas gift (otherwise I won't get anything!)

My 2014 Genesis Equilibrium commuter. It was originally a metallic dark gray with green and yellow stripes-I asked Mercian to repaint it; the decal...

I sometimes cross that intersection in the middle of the night, and there are usually some drunk pedestrians around. Being near the arch is worse because they...

Editorial, general: information [at] road.cc Tech, comment: tech [at] road.cc Fantasy Cycling: game [at] road.cc Advertising, commercial: sales [at] road.cc Check out our media pack

Report an ad on road.cc

All materials © Farrelly Atkinson (F-At) Limited, Unit 7b Green Park Station BA11JB. Phone 01225 588855. Unless otherwise stated, © 2008 to present. Terms and conditions of use.