rear sproket and chain modification on the Agattu

[musicbooks]

I think I've missed something here.. and lost the thread again! Could someone explain to me in the simplest possible language..how and why the sprocket and chain should be altered on the Agattus.. here's me thinking they were perfect and beyond criticism Then I'll practise with a cardboard cut out version until I get the real thing
BW
musicbooks

 

[stokepa31]

Hi MusicBooks

I think its down to personal preference. It would seem from Flecc's review that at 15.5mph your legs will be doing about 65rpm with a standard model. Many people would find that a bit under geared. In order to give a bit more resistance some would opt to change the rear cog for a smaller number of teeth. I beleive it is supplied with a 22 teeth rear sprocket in order to gear it down to the legal limit. If you like a bit of zip, 17 or 18 as been suggested to be about right. It follows that if you have a smaller cog on the back, the chain will need to be a tad shorter to take up the slack created.

Paul

 

[flecc]

In your territory I'd advise you ride it as standard initially Musicbooks to see how you find it tackling your hills. Then if you find you never need 1st gear even on the steepest hill, change the rear sprocket to a 20 tooth. If you find you don't need 1st or 2nd gears, change the sprocket to a 19 tooth. Your area is too hilly for the other smaller ones.

As Paul has said, it's undergeared from a pedalling point of view to match the EU law's maximum assist of 15.5 mph.

A much better technical solution would be for the maximum assist speed to be achieved in 6th gear, with power disengaged in 7th. But of course that would mean a special version of the Shimano hub gear or it's handlebar control to do the disconnecting in top.
.

 

[stokepa31]

Flecc

been looking on SJS at sprockets - will this one do the trick. I am thinking 16 teeth for my pro-connect. will it be 1/8 or 3/32?

Paul


Hub gear Sprocket - Fits Sturmey Archer / Sachs /

 

[flecc]

That's the one, 16 tooth 1/8".

That will give maximum power in top gear at up to nearly 14 mph, with assist finally ending by 21 mph. This will shorten the range though, since it will always have power applied unless you cut it at times.
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[cliff]

Took me a while to find these for my old Giant Expression N7, which came with an 18t sprocket and consequently couldn't a smallish molehill (at least not with my very unfit legs.
Postage is steep at £3.99 but they probably combine postage if you buy more stuff.
Good luck
Cliff

Bonthrone

 

[stokepa31]

Sounds like just the ticket. My commute is fairly short so range should'nt be an issue. On leisure rides I will be more inclined to turn the wick down or off all together.

Just got to think of something to do with the torq now. I cant flog it until Sept as technically my employer owns it until then!!!

No smart arsed comments about the pro connect not turning up till then please folks

Paul

 

[flecc]

Just got to think of something to do with the torq now. I cant flog it until Sept as technically my employer owns it until then!!!

Paul

My ex-Torq T bike has been laid up for the winter in the garage as it's only a fine weather bike so you could do the same, but run it at least once every couple of months and recharge to keep the battery ok.

I've got a discharging charger so I'm able to use that instead.
.

 

[musicbooks]

Thanks folks once again for clarity and informed guidance.
BW
musicbooks

 

[burncycle]

I plan to use the bike as it comes and get a bit fitter before I make any changes first.
Question......
If I wanted to change the spocket and chain, would it be a big job for a bike shop to do?
What price might they charge me?

 

[Citrus]

I plan to use the bike as it comes and get a bit fitter before I make any changes first.
Question......
If I wanted to change the spocket and chain, would it be a big job for a bike shop to do?
What price might they charge me?

It is not a big job - fairly straight-forward to do. Flecc has a walk through on his website on how to change the rear sprocket and changing/shortening the chain is easy enough once you know how.

I can't imagine a bike shop charging more than £20 labour + parts for doing it. It took me me about 1/2 an hour to do it and I'm not a trained mechanic (but I have done DIY on motorbikes and bicycles before).

 

[stokepa31]

Do you have a link for that Citrus. I cant seem to find it on Flecc's site.

Cheers
Paul

 

[robert44]

It is not a big job - fairly straight-forward to do. Flecc has a walk through on his website on how to change the rear sprocket and changing/shortening the chain is easy enough once you know how.

I can't imagine a bike shop charging more than £20 labour + parts for doing it. It took me me about 1/2 an hour to do it and I'm not a trained mechanic (but I have done DIY on motorbikes and bicycles before).

I had my sprocket changed to 18tooth by my local cycle shop and all it cost, including sprocket, was £12. As you will need a chain pin extractor, is it worth the bother?

 

[Citrus]

Sorry Paul, my fault

Do you have a link for that Citrus. I cant seem to find it on Flecc's site.

Cheers
Paul

I have just checked and you are right. I got mixed up with this repairs

This explains how to change the drive chain sprocket. I will try to post a step by step guide of how I did mine in a week or two (very busy just now) as I guess a few people will want to try and do it themselves.

 

[flecc]

I only have a derailleur cassette sprocket set removal description on site, not this hub gear one. It's very straight forward though, and as Robert has said, for those without the right tools, best to use the local bike shop who will do it quickly and cheaply.

50cycles will do it pre-delivery on new bikes for a very reasonable £15.
.

 

[Citrus]

I had my sprocket changed to 18tooth by my local cycle shop and all it cost, including sprocket, was £12. As you will need a chain pin extractor, is it worth the bother?

Probably not, but I like how to know how to do things myself, plus I had all the tools to do the job anyway. Also, I may change the sprocket again at some future point, or renew the chain and sprockets when they are worn, and at that point I won't have to rely on a shop to do it for me.

 

[Citrus]

Hi flecc

Thanks for putting me on the google map earlier today

 

[flecc]

No prob!

You won't find the sprocket change will cause you difficulty, just dive in and you'll see how it's done.
.

 

[flecc]

This site illustrates a chain link tool and describes how to use it for removing links and fixing tight links:

Bicycle chain repair - breaking and fixing a chain
.

 

[burncycle]

I only have a derailleur cassette sprocket set removal description on site, not this hub gear one. It's very straight forward though, and as Robert has said, for those without the right tools, best to use the local bike shop who will do it quickly and cheaply.

50cycles will do it pre-delivery on new bikes for a very reasonable £15.
.

So you think 50cycles would do this for me pre-pickup.
Do you think its really worth it to change the sprocket before ive checked it out with the standard sprocket Flecc?
If so which one?