Highlights from the 2014 LA Auto Show

GOKISO Aerospace Hub for bicycles aims to give bearings a break

By

June 28, 2011

The GOKISO Aerospace Hub for bicycles is designed to keep bearings from getting compressed...

The GOKISO Aerospace Hub for bicycles is designed to keep bearings from getting compressed when the axle shaft deforms under pressure (Photo: Gizmag)

Image Gallery (6 images)

If you've ever watched the Tour de France and winced as all those skinny-wheeled racing bikes bounced over the cobblestone roads ... well, you were right to do so. Not only are such hard, rough surfaces capable of bending rims, but they're also hard on hub bearings - as the axle shaft flexes ever-so-slightly in response to hitting bumps, the ball bearings that encircle it are pressed against the hub's bearing races, both causing friction and potentially damaging the bearings. Japan's Kondo Machine Corporation, however, has created a product that is claimed to minimize this problem. It's the "jet-engine-inspired" GOKISO Aerospace Hub, and we spied it last week at the 49th Paris Air Show.

The big secret to the GOKISO hub is its ability to spring under pressure. In a traditional hub, the axle shaft is unyieldingly connected to the rest of the hub. This means that any time the shaft flexes, it immediately presses against the inside of the hub. At either end of the GOKISO, however, there's a half-millimeter of space between the shaft and the hub body. While that might not sound like much, it's reportedly enough to allow the shaft to deform under pressure, without coming into contact with the inside of the hub.

The GOKISO Aerospace Hub has 0.5mm of play between the axle shaft and the hub body, to kee...

The Aerospace Hub also features two sets of deep-groove bearings at either end of the shaft (for a total of four per hub), whereas most hubs just utilize one shallow-groove bearing per end. Although deep-groove bearings are able to handle heavier loads, they are also less tolerant of misalignment. The springing action helps keep such misalignment to a minimum, but so do the hub's unique spherical nut and washer.

With a regular hub, there is absolutely no play between the axle and the bicycle's frame. According to Kondo, this means that the hub can be deformed when the wheel is mounted on the bicycle, as the axle bends to accommodate the inside angle of the dropouts. The Aerospace Hub's spherical nut and washer, however, are able to slide up and down against one another, instead of simply locking up face-to-face. This means that even if the front fork dropouts are splayed into a V-shaped orientation, the axle will still run straight between them, instead of bowing.

The GOKISO Aerospace Hub for bicycles is designed to keep bearings from getting compressed...

All of this innovation does come with a slight weight trade-off ... depending on what you're comparing it to. The front Aerospace Hub weighs 240 grams (8.5 ounces), with the rear tipping the scales at 455 (16 oz). By comparison, a Shimano Dura-Ace front hub weighs 125 grams (4.4 oz), while the rear sits at 254 (9 oz).

If you're interested in becoming a cycling pioneer, Kondo is currently selling a test batch of the GOKISO hubs on the company website. A front and rear hub together will set you back 150,000 yen, or about US$1,849.

The video below explains how the hubs work, in more detail.

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away.   All articles by Ben Coxworth
13 Comments

I was hoping that it would be magnetic bearings.

Slowburn
28th June, 2011 @ 10:22 pm PDT

I was hoping for 250kph.

Mark A
28th June, 2011 @ 11:31 pm PDT

Cup and Corn bearings!!! presume cup and cone

greytoma
29th June, 2011 @ 12:48 am PDT

And again, and again - why the draconian price tag?

Renārs Grebežs
29th June, 2011 @ 01:53 am PDT

A very expensive solution in search of a problem. Riders go thousands of miles on each set of cartridge bearings in conventional sealed bearing hubs. Water and dust contamination are the major causes of bearing wear and failure, not some insignificant axle flex. If axle flex was really a problem, just use oversize hollow axles like the old Phil Wood hubs or put a third bearing dead center in the hub shell to provide additional support against deflection. This is even more pointless than replacing steel bearings with expensive ceramic bearings.

Gadgeteer
29th June, 2011 @ 05:07 am PDT

I agree with Gadgeteer on all but the ceramic bearing comment. Yes, ceramic bearings are more expensive, but lower friction coefficients and thus less drag, less wear can be achieved with ceramic bushings/bearings that with steel bearings.

Also, designing in some freeplay in order to reduce bearing loading is admirable, but using a better bearing and race which can cope with the loading in the first place is a better solution. Leave the 'suspension' up to the tyre/spokes/fork. Hubs should be rigid.

Personally, I love my durace hubs on my roadbike, but I also admire Chris King products; http://bertiebuck.co.uk/files/2011/05/Chris_King_rear_hub_cutaway.jpg

A real aerospace solution would be to use a fluid film bearing, if that could be done...

PeetEngineer
29th June, 2011 @ 07:48 am PDT

wow , just what we got to have, more bearings. how about a synthetic grease for the old bearings.. when was the last time you burnt out a set of bearing on your bike ? the hub on a bike turns so SLOW in the first place, the only place I could use a better wheel hub design, is on a wheelbarrow ! .. jay the pool pump motor repair guy in longwood Florida

Jay Finke
29th June, 2011 @ 08:56 am PDT

This looks like a two-grand Rube Goldberg contraption. Why not just use beefier axle and bearings to eliminatae the flex during shock loads?

Tylus
29th June, 2011 @ 09:11 am PDT

Serious bikers pay a high premium to reduce weight. I don't think anyone would pay a premium to add weight just so a part that rarely wears out would very rarely wear out.

conrad
29th June, 2011 @ 11:08 am PDT

OVERKILL PLUS! This is exactly what happens when an aerospace engineer designs a bicycle part. I've seen it many times before. And sure I need a $1600 bearing for my $80 wheelbarrow. Right. How about an unobtainium shoehorn?

Cute idea but bad business decision. And what a waste of resource and money.

epochdesign
29th June, 2011 @ 11:12 am PDT

Gee, Gadgeteer, then they could not puff the ego and smile and charge for the kiddies who never heard of Phil Woods. They would be shamed as disgraced pioneers in the ever lucrative field of a intsy tiny bang for BIG BUCKS are you some sort of Commie??!!

Have we not seen too numerous examples of "engineers" ruining what they took up in eligant form..only to transmogrify into- can I say abomination? design schools, now its sky high engineers...

and even the well proven sandal got those AIR soles- last how long? cost how much!!$#?

Walt Stawicki
29th June, 2011 @ 01:23 pm PDT

Why not simply make spherical surface washer pairs to add to any existing axle? Use them in sets on both sides of the fork and rear dropouts and non-parallel surfaces won't matter, up to the limit of the motion range of the washers.

That would be an accessory millions of bike riders would buy, if the price is cheap enough. It would certainly eliminate any bending forces on the axles from cranking down nuts on non-parallel dropouts.

Why should the axle shaft come into contact with the inside bore of the hub? Who makes a hub with such a ridiculously tight tolerance bore? The bearing at each end supports the hub on the axle.

These hubs are a solution in search of a mostly non-existent problem.

Gregg Eshelman
30th June, 2011 @ 12:01 am PDT

Actually...... Having a history in BMX free styling I have crushed quite a few hub bearing assemblies. Smashed rims, broken frames. I cant tell you how many goose necks I have stripped out.

I have torn apart many hubs and cranks to find pitted damaged bearings. I have used many types of lubes. I prefer amsoil grease for bearing life.

IF you can build a better HUB more power to ya, but don't build a $ 10,000.00 hub and proclaim its wonderful when no one will ever use it due to massive cost.

people coasting around the neighborhood are not going to stress hubs. But the hardcore will rejoice.

mjs1231
30th January, 2012 @ 07:03 am PST
Post a Comment

Login with your gizmag account:

Or Login with Facebook:


Related Articles
Looking for something? Search our 29,578 articles
Recent popular articles in Bicycles
Product Comparisons