Rethinking the rear hub
04-24-12, 07:03 AM
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Rethinking the rear hub
Kappius has a new & radical rear hub design: https://www.bikerumor.com/2012/04/22/...cutout-design/
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04-24-12, 08:47 AM
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Pretty cool. I love the pawl design.
04-24-12, 08:51 AM
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Great for DH but it doesn't move the flange any further out to strengthen the wheel itself.
The overall design is beautiful though.
The overall design is beautiful though.
04-24-12, 08:52 AM
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Pretty cool. Innovation is always good.
I did read one reader's gripe that cassettes are consumables, and we don't need any more proprietary stuff to complicate things (my take on it).
We stil have things pretty good as to standards, and getting cassettes and the like is very easy. The overall attitude towards bicycles has definitely changed though IMO, they are considered entirely disposable by so many riders. I rode a 10 year old bike the last group ride, and had the oldest bike in the fleet by a longshot. Someone even commented how "Old School" my bike was. Yikes!
Anyway, improvement is always a good thing, not saying that hub is an improvement (don't know) so what the hell.
I did read one reader's gripe that cassettes are consumables, and we don't need any more proprietary stuff to complicate things (my take on it).
We stil have things pretty good as to standards, and getting cassettes and the like is very easy. The overall attitude towards bicycles has definitely changed though IMO, they are considered entirely disposable by so many riders. I rode a 10 year old bike the last group ride, and had the oldest bike in the fleet by a longshot. Someone even commented how "Old School" my bike was. Yikes!
Anyway, improvement is always a good thing, not saying that hub is an improvement (don't know) so what the hell.
04-24-12, 08:58 AM
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Looking at that design, is there any reason it has to be that wide other than to fit modern spacing? The main advantage I see is you could mfg that design to fit a 9, 10 or 11 speed into old spacing without cold setting.
04-24-12, 09:24 AM
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one day some body will start on a clean piece of paper.
a single cog on the rear, chained to 10-20 gears on a splined axle,
instead of a derailleur moving the casset is pushed and pulled L to R to keep the chain straight and true,
only a chain tensioner would be required.
if you really wanted to start further from scratch the third axle would have 2 conical interlocking frames making a variator, belt drive the thing to loose more weight.
Honestly the Derailleur is over 60 years old. How much further can it go?
a single cog on the rear, chained to 10-20 gears on a splined axle,
instead of a derailleur moving the casset is pushed and pulled L to R to keep the chain straight and true,
only a chain tensioner would be required.
if you really wanted to start further from scratch the third axle would have 2 conical interlocking frames making a variator, belt drive the thing to loose more weight.
Honestly the Derailleur is over 60 years old. How much further can it go?
04-24-12, 10:33 AM
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04-24-12, 12:35 PM
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the gas is now unleaded and the tires are radial and tubeless!
04-24-12, 01:20 PM
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What's the point?
Where is the Powertap?
Where is the Powertap?
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04-24-12, 01:50 PM
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04-24-12, 05:17 PM
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This hub is perhaps most significant in that the tall driveside flange is directly supported by the hubshell, anthough not entirely unique in that respect.
Many oversized flanges used in the past have actually increases flex, since the spokes did not pull directly in line with the plane of the flange, causing lateral flex in the flange.
At the moment, the biggest potential for getting more gear ratios with the least amount of wheel dish and cross-chaining seems to be electric shifting.
Electric shifting dramatically improves the precision of derailer movements, including controlling the speed of movement. This will allow further narrowing of sprocket spacing.
Electric shifting might also allow for programmed control between front and rear derailers, taking advantage of the biggest number of chainring/cog combinations for an increased usable number of sequentially-selected gear ratios.
Having the chainrings closer together in size allows closer sprocket spacing, which might enable an increase in the number of chainrings, and together with the programed shift control of both derailers could further reduce chain angle and friction. Such a stack of chainrings could be relatively light, using an integrated fabrication similar to the Powerdome cassette in the rear (noting that sprocket spacing of existing chainrings is now necessarily much greater than the spacing on the cassette, because of the wider-ratio difference in the size of adjacent sprockets).
I think that Electric shifting will gradually move to much lower price points, and will end up getting wide use for off-road riding.Having a sliding stack of sprockets requires a jackshaft to exploit the possibility of a stronger, lighter rear wheel, but even with the straighter chainline would likely increase overall friction.
Many oversized flanges used in the past have actually increases flex, since the spokes did not pull directly in line with the plane of the flange, causing lateral flex in the flange.
At the moment, the biggest potential for getting more gear ratios with the least amount of wheel dish and cross-chaining seems to be electric shifting.
Electric shifting dramatically improves the precision of derailer movements, including controlling the speed of movement. This will allow further narrowing of sprocket spacing.
Electric shifting might also allow for programmed control between front and rear derailers, taking advantage of the biggest number of chainring/cog combinations for an increased usable number of sequentially-selected gear ratios.
Having the chainrings closer together in size allows closer sprocket spacing, which might enable an increase in the number of chainrings, and together with the programed shift control of both derailers could further reduce chain angle and friction. Such a stack of chainrings could be relatively light, using an integrated fabrication similar to the Powerdome cassette in the rear (noting that sprocket spacing of existing chainrings is now necessarily much greater than the spacing on the cassette, because of the wider-ratio difference in the size of adjacent sprockets).
I think that Electric shifting will gradually move to much lower price points, and will end up getting wide use for off-road riding.Having a sliding stack of sprockets requires a jackshaft to exploit the possibility of a stronger, lighter rear wheel, but even with the straighter chainline would likely increase overall friction.
Last edited by dddd; 04-24-12 at 05:21 PM.
04-24-12, 05:40 PM
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It's a very mis-leading write-up.
The 'red' cassette body shown isn't typical of a Shimano cassette body which has the support/stress much more outboard than what they depict with the 'red' cassette body.
Dont believe the hype....
The 'red' cassette body shown isn't typical of a Shimano cassette body which has the support/stress much more outboard than what they depict with the 'red' cassette body.
Dont believe the hype....
