agattu 11 tooth sprocket

[carpetbagger]

yesterday i joined the 11 tooth sprocket club ! For anybody unsure of the change,its dead easy,remove chain guard (1 bolt),take chain of drive sprocket by releasing chain tensioner,1 pair of circlip pliarsto remove circlip and then reverse the process and thats it..5 minute job.
I then went for a 10 mile ride. The first thing i noticed was that before the change my 6th gear was where 7th should be and vice versa (if thats possible) this was now corrected and gears seemed to be in correct order.
It was very windy so i spent a lot of the time on medium power. On the incline upto my house i previously achieved 12.5mph on the Powabyke,15mph on the Agattu before the change but i flew up at over 18mph with the new sprocket.
I was expecting the first light to go out at 5/6 miles given what people had said on the forum but it atually lasted to 9.5 ! On that basis i think the change was worthwhile but i need to go on a longer run to confirm it

 

[thunderblue]

that sounds good - keep us posted after the longer trip. where can I buy the 11 tooth sprocket?

 

[carpetbagger]

hi thunderblue
see link below,delivery took 2 days
50cycles Electric Bikes - Kalkhoff Electric Pedal Cycle Spare Parts

 

[tangent]

Quite a coincidence - I fitted a 11T motor sprocket to my new Technium Privilege (aka Agattu) last night as well. I completely agree with carpetbagger. Where I was only managing 14mph before I was doing 17mph today. No idea on the range - I only do a 15 mile round trip anyway.

I still only have a 21T on the hub, but have an 18T ready to go on. This might be overkill now.

Does anyone like this 7 speed hub though? I am finding it very difficult to get into gear 6. It tends to dump me in 7 or some horrible indeterminate state that is very hard to peddle in.

 

[carpetbagger]

Quite a coincidence - I fitted a 11T motor sprocket to my new Technium Privilege (aka Agattu) last night as well. I completely agree with carpetbagger. Where I was only managing 14mph before I was doing 17mph today. No idea on the range - I only do a 15 mile round trip anyway.

I still only have a 21T on the hub, but have an 18T ready to go on. This might be overkill now.

Does anyone like this 7 speed hub though? I am finding it very difficult to get into gear 6. It tends to dump me in 7 or some horrible indeterminate state that is very hard to peddle in.

I think the 7 speed hub is all about stopping pedalling for 2 secs on a down change and listening for the satisfying click of the change !...make sure you dots are aligned by putting in 4th and making adjustment on cable to gearshifter on handlebars

 

[tangent]

I think the 7 speed hub is all about stopping pedalling for 2 secs on a down change and listening for the satisfying click of the change !...make sure you dots are aligned by putting in 4th and making adjustment on cable to gearshifter on handlebars

It is not just the change down that is a problem, but the change up as well. Do you wait for this as well?

The yellow dots were all fine last week but I will check again later. Trouble is I have been spoilt by riding a bike with a Nexus 8 hub for 5 years. I will try to be more patient.

 

[carpetbagger]

i think generally its ok on the change up although i must admit occasionally i do the 2 sec stop there as well but i don't think its really needed

 

[lemmy]

Does anyone like this 7 speed hub though?

I had the 7 speed on my Kalkhoff Agattu and now have the 8 speed on my Kalkhoff Tasman. No question, the 8 speed is altogether sweeter and well worth any extra cost for the quality of change alone.

With the 7 speeder, I needed to make a definite pause in pedalling to change, with the 8 relaxing pedal pressure is enough.

It surprises me, as I would have thought that the internals would be much the same in both.

 

[flecc]

Fecn and I tried the 11 tooth and 9 tooth on identical comparative runs a short while ago, using his Agattus and the 11 tooth didn't entirely convince in a hilly area of the North Downs. I ended up preferring the standard 9 tooth, but that's better with a wide range gearhub like the NuVinci on Fecn's bike. That combination gives the normal performance and climbing but with higher assist speeds as well.
.

 

[carpetbagger]

if you have the 11 tooth sprocket and the 18 tooth hub is that going to give an assist speed of 22mph given the 11 tooth adds about 3mph and the 18 tooth hub about 19 looking at your web page ?...but it will eat the battery !

 

[Teejay]

I found combining an 11 tooth engine sprocket with an 18 tooth hub one was definitely overgearing. The standard motor simply doesn't have the power to pull it. Likewise, I found it spoiled the hillclimbing.

I've found 20 tooth works fine with my 7-speed Agattu. I've not tried it but you might get away with 19t.

Surprisingly, I found the 11t seemed to have little effect on range

 

[carpetbagger]

cheers Teejay
i will stick at the 11 tooth,the range is important to me and it seems the increase in cutoff speed is just about right,also there are a few hills around here so i can't afford to loose hill climbing ability.

 

[flecc]

I agree, I doubt the 11 tooth makes much difference to range with the standard sprocket. The increased 11/18 combination you mentioned will probably hurt the range, but it's difficult to judge the plus/minus balance of speed gained and consumption due to increased speed range of motor use. So much depends on the rider contribution.

10 or more years ago I might well have been happier with the 11 tooth sprocket, but now I'm that much older the balance has tilted the other way.

One day it might have to be four wheels and 4 mph on the pavement!
.

 

[carpetbagger]

One day it might have to be four wheels and 4 mph on the pavement!
.

nowadays they are available with 5 wheels !!

 

[flecc]

nowadays they are available with 5 wheels !!

My cars have six, four on the road, one spare and one I turn to go round corners.
.

 

[thingaby]

I'm also getting used to my new Technium and the 7 speed gears. I was a bit worried about moving to a step through but this is such a 'big' bike it feels positively butch. And the quality of the bike is remarkable. It runs so smoothly.
One question. I can definitely discern a pulsing effect in some circumstances. As though the motor is giving pulsed help. I suspect that might be something about the cadence of my pedalling and getting into the right gear. I've read and tried to inwardly digest Flecc's defintive guidance on the best techniques with the Panasonic drive. What's your take on the pulsing?

 

[carpetbagger]

yes,i have had that,i think its when you need to drop a gear but i am sure Flecc will advise

 

[flecc]

Yes, it is when you drop a gear or speed up and the cadence is at the hinge point of a step down in power. With the power phase down in steps, if the speed balances on a step point the power can surge and drop alternately until the system makes it's mind up what point it's on. This effect can be worsened if extra pedal thrust coincides with a surge point, since the torque sensor measuring the pedal effort increase will multiply the surge power.

The answer is to ride through that pedal speed point or drop below it.
.

 

[HarryB]

Does anyone like this 7 speed hub though? I am finding it very difficult to get into gear 6. It tends to dump me in 7 or some horrible indeterminate state that is very hard to peddle in.

I am always banging on about how awful the change is on the 7 speed compared to the 8 speed - probably the main reason I got rid of my Agattu. If I got the change wrong the outer gear cable would jump out of the locator and I would have to pop it back in. Andrew Harvey does say that they become much smoother after a fair bit of use so maybe it will improve.

I have just put an order in for the Emotion Sports Max + but that has deuralliers so I will have to change the cassette to change the gearing. Perhaps the 11 sprocket is a better solution and I should try that first. The Agattu did feel very under geared though.

 

[flecc]

I have just put an order in for the Emotion Sports Max + but that has deuralliers so I will have to change the cassette to change the gearing. Perhaps the 11 sprocket is a better solution and I should try that first. The Agattu did feel very under geared though.

Very nice Harry, I hope you have secure parking, given those beautiful flat spoke quick release wheels.

I'd think the 11 tooth would be good for such a light and agile bike, especially with a fit rider. I found it a bit iffy with the much heavier Agattu and my lesser ability.
.