i got 10-50t and 2 front sprockets

 

And lots of duplicated ratios!

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18t is for uphill and 20t is for the flat and down hill you can notice a difference with the 2.5 multiplier

From memory, I think my particular model was known to have issues and was discontinued after a short while. Lost my faith in Shimano after that.

 

That's correct. Although that four gear hub was their most efficient, it was their most unreliable. A string of its failures on the low powered Giant Lafree Comfort model caused Shimano to discontinue it.

 

It also had slightly less gear range (198%) than their three speed (200%), making it less necessary in marketing terms.

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What about the old Sturmey Archer then. Do they still exist? Didn't they last for ever?!

What about the old Sturmey Archer then. Do they still exist? Didn't they last for ever?!

 

Yes and yes. But I like our Nexus 8, used together with its Gates belt a lot more.

What about the old Sturmey Archer then. Do they still exist? Didn't they last for ever?!

 

Yes, but the company name and assets were bought by the Sunrace company in Taiwan where they are now made.

 

They are now known as Sunrace Sturmey-Archer inc. and the gears have been re-designed.

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Genuine research here says that the biggest factors affecting the drive train efficiency are sprocket size and the amount of tension in the chain. Higher tension gives greater efficiency, so that implies that a derailleur would be more efficient due to the higher chain tension provided by the spring in the derailleur unless you have a sprung tensioner on your hub gears. The video is interesting. It shows virtually no energy being wasted on the derailleur compared with the drive sprocket.

http://pages.jh.edu/~news_info/news/home99/aug99/bike.html

I'm struggling a bit with the above paragraph as I would have thought that anything putting back tension on the chain will be a force working against the gear trying to drive it forwards.

I also don't thing that there is anything wrong with hub gears but for a country as hilly as the UK a larger number and spread of gears would be preferable and apart from the expensive Rolhof this leaves the derailleur. Having gone from a single speed in 1952 and through the Sturmy Archer 3x speeds to today's offerings, the worse set up I've had was the 8 speed EX1 with 11 to 52 cogs. Much too large jumps in the ratios and quickly changed to the 11 speed Shimano.

My X-rd3 and X-rd5(w) both change gear on the steepest Snowdonia , has to offer . I change up hill I take weight off chain indeed the X-rd3 has a gear change sensor that stops the motor while the shift takes place. I change stationary and down hill too easy easy peasey what ever. If you find any other scenario there’s something wrong either with technique or mal-adjusted somethings . It couldn’t be more simple. Unlike derailleur systems where it takes meters and meters of road to complete a change. Especially when it comes to a monster hill climbing granny. It’s the opposite of what’s easy and requires forward thinking that in return requires experience.5

My X-rd3 and X-rd5(w) both change gear on the steepest Snowdonia , has to offer . I change up hill I take weight off chain indeed the X-rd3 has a gear change sensor that stops the motor while the shift takes place. I change stationary and down hill too easy easy peasey what ever. If you find any other scenario there’s something wrong either with technique or mal-adjusted somethings . It couldn’t be more simple. Unlike derailleur systems where it takes meters and meters of road to complete a change. Especially when it comes to a monster hill climbing granny. It’s the opposite of what’s easy and requires forward thinking that in return requires experience.5

Hmmmm! IMHO, you're missing a couple of things and what you're saying isn't quite right. If your type of gears were so X-fantastic, they'd be using them in the Tour de France, but they don't. I'm going to say that they're too clumsy, too heavy, too unreliable and make wheel removal more complicated.

 

I don't know where you get the idea that derailleur gears "takes meters and meters to complete a change" from. You need to compare like for like regarding cost, not compare a rather expensive hub with cheap stamped gears on a £100 catalogue bike that never got set up between leaving the factory and its regular journeys to the station, whose gears probably cost less than a fiver. Properly adjusted decent derailleur gears will not only shift quicker than hub gears, but even during mid shift, they're still allowing transmission of power. In other words, whether shifting up or down, drive is continuous because the chain is always engaged with enough teeth to provide drive. This gives a massive advantage in any sort of racing, and leisure riders get that advantage when hill-climbing. On really steep hills, like 25% plus,, you can't afford to pause between shifting because the bike will stop, then you're stuck - horses for courses.

 

In summary, hub-gears are great for the girls that want to have a liesurly ride down to the supermarket without getting their dresses caught in the gears or chain.

Hmmmm! IMHO, you're missing a couple of things and what you're saying isn't quite right. If your type of gears were so X-fantastic, they'd be using them in the Tour de France, but they don't. I'm going to say that they're too clumsy, too heavy, too unreliable and make wheel removal more complicated.

 

I don't know where you get the idea that derailleur gears "takes meters and meters to complete a change" from. You need to compare like for like regarding cost, not compare a rather expensive hub with cheap stamped gears on a £100 catalogue bike that never got set up between leaving the factory and its regular journeys to the station, whose gears probably cost less than a fiver. Properly adjusted decent derailleur gears will not only shift quicker than hub gears, but even during mid shift, they're still allowing transmission of power. In other words, whether shifting up or down, drive is continuous because the chain is always engaged with enough teeth to provide drive. This gives a massive advantage in any sort of racing, and leisure riders get that advantage when hill-climbing. On really steep hills, like 25% plus,, you can't afford to pause between shifting because the bike will stop, then you're stuck - horses for courses.

 

In summary, hub-gears are great for the girls that want to have a liesurly ride down to the supermarket without getting their dresses caught in the gears or chain.

My X-rd3 and X-rd5(w) both change gear on the steepest Snowdonia , has to offer . I change up hill I take weight off chain indeed the X-rd3 has a gear change sensor that stops the motor while the shift takes place. I change stationary and down hill too easy easy peasey what ever. If you find any other scenario there’s something wrong either with technique or mal-adjusted somethings . It couldn’t be more simple. Unlike derailleur systems where it takes meters and meters of road to complete a change. Especially when it comes to a monster hill climbing granny. It’s the opposite of what’s easy and requires forward thinking that in return requires experience.5

To change one sprocket on my Shimano XT takes between 1and 2 seconds. Almost too quick to time.

In summary, hub-gears are great for the girls that want to have a liesurly ride down to the supermarket without getting their dresses caught in the gears or chain.

 

yea yea yea

I think it comes down to expense and complexity.

If something goes wrong with my deraileur, I fix it in the shed with readily available parts. having set mine up I haven't had to touch it in about 3k miles. This despite stories of cable stretch, bent hangers etc.

I admire the engineering of hubs but, really, they are far beyond KISS.