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Old 02-11-07, 06:12 PM   #1
lukeC
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Old Suntour 3 Speed Internal - "Neutral"

Hi,

I'm rather new here. I did a search but couldn't find any info on on of these.

I bought this old Repco Folding Bike from Ebay the other day. cheap.. I was thinking of fixing it up a bit as a pub bike / something you can throw in the car when a bike might be handy..

But it has a few problems.

1. The Suntour 3 speed internal geared hub isn't working too well. - when its in the highest gear it sometimes slips into a "neutral" type gear. the pedals swing with no resistance in either direction.

how would i correct / fix this? and how do i set the gear cabling correctly - the shifter is in poor condition and seems barely functional. I may have to replace it.

Suntour 3 speed with Freewheel




The other problems -
2. The steel rear rim seems to have like a flat spot almost - it has a noticable dip in it tha tyou can feel while riding. - is this fixable? is this bad?
I've never messed with spokes or tryed to correct a buckled wheel even. - i'm a bit new to all this.





3. Does anyone have any info on these bikes?
the wheel base seems a bit short (i'm 6ft) is it going to be possible to get a reasonably comfortable ride on this bike? with longer seat post and extending the handlebars?


4. The cranks are quite short but there is clearance for a bit more. I think. so i'd like to put longer crank on it - only they are cottered cranks.. I suppose i'd have to replace the entire Bottome Bracket axle and bearigns assembly?
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Old 02-11-07, 06:46 PM   #2
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The Sun Tour 3 speed hub is the same as a Sturmey Archer AW (probably made by). If it slips in 3rd it probably needs to taken apart and cleaned. There is a spring inside that could be bad but generally cleaning will do it. Roger
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Old 02-11-07, 07:22 PM   #3
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Here is a web site that may help you with this problem: http://www.users.globalnet.co.uk/~hadland/s3c.pdf

If this is the wrong hub then go here and select the right one: http://www.users.globalnet.co.uk/~ha...samaintind.htm
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Old 02-11-07, 07:23 PM   #4
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1. the hub probably just needs an adjustment; seeSheldon's browns article.

2. in the picture, it looks like the tire is not seated. there is a molded line on the tire that should sit at approximately the same spot around the rim. if you deflate the tire slight and shift the tire around, you may be able to seat it. a little soapy water can help as well. if the rim itself is dented, someone skilled at truing wheels may or may not be able to make it round again.
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Old 02-11-07, 08:54 PM   #5
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Quote:
Originally Posted by froze
Here is a web site that may help you with this problem: http://www.users.globalnet.co.uk/~hadland/s3c.pdf

If this is the wrong hub then go here and select the right one: http://www.users.globalnet.co.uk/~ha...samaintind.htm
oh thanks!!

yeah there is heaps of info there. - I thinkit may be The AW 3 speed as the S3C has a Coaster Brake part.
which mine does not.

- I will try adjusting it.
Actually the shifter on the handlebars seems to be damaged - it doesn't really click into place for the 3 or 2 . Is it difficult to find replacements these days?
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Old 02-12-07, 05:06 AM   #6
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I have a drewer full of SA shifters, PM me and I'll send you one for postage.
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Old 02-12-07, 10:05 AM   #7
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This is the site I use. A picture is worth a thousand words.
http://www.karrot.org/ascotto/three_speed/

Are you saying that the trigger shift is too damaged to operate in order to set the shifter into 2nd gear?It's probably just an adjustment issue at the indicator rod/chain/cable - down there at the little knurled knob near the hub. You need to set the shifter to 2nd to make the adjustment. Look at the diagram on the website under Adjusting Your Hub.

There are setback seatposts available. Maybe try looking around a BMX shop. The 'compactness' of the bike is a consequence of design. 20" wheels require short cranks because the BB and axles are closer to the ground. Some of the newer ones are more ergo, and expensive. Cool bike BTW. I had one very similar that I hung on the back of the camper for years. I used it to run to the camp store and haul firewood back all the time. Good rig for hauling all the fishin' gear down to the lake, too.

Wait just a minute there... I just took another look at your pic. I don't see the knurled lock-ring. It should be run up against the long knurled barrel at the end of the cable. Without that I don't doubt why it's out of adjustment. Someone took the cable apart at one point and forgot to put the ring back on...

You need to get one in order to adjust and lock in the setting. Other wise, the indicator rod will not stay in place. I don't have a spare but I'll bet one of the guys here will give you one.
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Old 02-12-07, 10:53 AM   #8
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Quote:
Originally Posted by rhenning
The Sun Tour 3 speed hub is the same as a Sturmey Archer AW (probably made by). If it slips in 3rd it probably needs to taken apart and cleaned. There is a spring inside that could be bad but generally cleaning will do it. Roger
It is correct that this hub is a licensed knockoff of the Sturmey-Archer AW.

See: http://sheldonbrown.com/sturmey-archer/aw.html

However I very much doubt that it needs to be taken apart, and I don't think there's anything wrong with the clutch spring...those generally last forever.

There is a "neutral" position between gear 2 and gear 3. If you're hitting this when you've selected gear 3 it indicates one of two things:

1. The cable may be adjusted a wee bit too tight.

B. There may be excessive friction in the cable/trigger system, preventing the spring from pulling it all the way to 3rd gear. This is especially likely on a folding bike like this, since there's full-length housing that has to make a number of bends due to the nature of the folding bike's frame.

I think "B." is the most likely explanation. I would put a couple of drops of oil on the moving parts of the trigger, and would oil the shift cable with light oil worked in inside the housing. Better yet would be to replace the cable housing with modern lined cable housing.

The hub should also be oiled from time to time, and it's old enough that it may be overdue for this.

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Old 02-12-07, 01:00 PM   #9
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Your LBS should be able to put a new rim on that hub and no; a bent rim due to someone "curbing" it is not generally fixable. If your willing to spend some money on it have the LBS mount new alloy rims on both front and rear hubs. This will make it lighter in weight and braking will be improved considerably. If you don’t mind riding it with a bump every revolution of the wheel just leave it alone as it's not a real safety issue. Considering the abuse small fold up bikes like this get I would just tune it up and use it for it's intended purpose, tossing it in the trunk and taking it along on public transportation systems.
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Old 02-12-07, 04:15 PM   #10
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Hey, this forum is great. - i'm new and wasn't sure what to expect.

I agree with the above.
- after looking at the Manuals. Its clear that the lockring for the cable adjustment is missing which is problem. I will try and find a replacement - or something similar.

The Shifter is rather beat up. It has a few dings and is squashed in the middle. at the moment it doesn't really click into 2 or 3rd gear. there are markings but it behaves more like a friction shifter near there.

I may be able to fix the shifter if i pull it apart and straighten out some parts.
If i can't It would be great if i you could Sned me one Stacey.

and thanks for the tips on the curb damaged rim. - I think i'll just live with it for now. and see what turns up in the future ...
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Old 02-12-07, 04:26 PM   #11
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If anything it will be a great learning experience. Just keep me posted, k?
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Old 02-13-07, 02:46 PM   #12
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If you want to play with that shifter, this technical illustration might proove useful, as it did for me. But, if given the choice, I'd just replace it. Definitely find a locknut or any metric threaded nut that will fit.

http://genetics.mgh.harvard.edu/hanc...satriggers.pdf
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Old 02-13-07, 03:25 PM   #13
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Quote:
Originally Posted by jcm
If you want to play with that shifter, this technical illustration might proove useful, as it did for me. But, if given the choice, I'd just replace it. Definitely find a locknut or any metric threaded nut that will fit.

http://genetics.mgh.harvard.edu/hanc...satriggers.pdf
This is not a metric thread, and it's very unlikely to find a locknut to fit. Probably makes most sense to just buy a new indicator spindle (the part with the little chain.) We sell these for less than seven bucks.

Sheldon "Epicyclic" Brown
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Old 02-13-07, 04:34 PM   #14
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would i have to pull the entire hub apart to replace the indicator chain?
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Old 02-13-07, 04:49 PM   #15
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Disconnect the chain from the cable and hold the chain straight out from the hub and give it a twist. The whole assembly will unscrew from inside the axel nut.
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