SunTour 'New Winner' freewheel; state of the art in 1978

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Brucey
Posts: 43026
Joined: 4 Jan 2012, 6:25pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby Brucey » 19 Jun 2020, 11:58pm

just use a small hammer and (correctly shaped) drift to tighten/loosen the lockring. The adjusting race can be prodded round using a small screwdriver and doesn't need to be held (there is a beefy tab washer that stops it from turning).

You don't need to go nuts when tightening or loosening the lockring. If the lockring doesn't loosen when tapped for the first or second time, turn the freewheel body 180 degrees and try again on the other notch. Repeat as necessary until it loosens.

The correct shaped drift is close to the shape of a flat blade screwdriver, but with the end ground at a slight angle so that it bears against the notch correctly.

The correct adjustment is the first increment which gives no free play with the lockring tight. Increment the adjusting race tighter by no more than 1/30th of a turn at a time, and assess the free play with the locknut tight (it alters the clearance of course). 1/30th of a turn seems like a small amount but even this increment is ~30um clearance change. This is a barn-door clearance variation, in precision bearing terms.

As is almost invariably the case with freewheels, this work is best carried out with the freewheel still (tightly) on the wheel.

The 'correct spanner' is liable to get rounded off or slip more easily than it should, IMV, so it certainly isn't any better than using a hammer and drift. I have the correct spanner and I still find it easier (and probably better) not using it.

The only negative thing I would say is that if you raise burrs on the lockring of a 7s New Winner they can contact the inside of the #6 sprocket (or I suppose likewise #5 of a standard 6 spaced NW), which is bad; you need some clearance here so keeping the adjustment correct and dressing any burrs there might be on the lockring is important.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

drossall
Posts: 5131
Joined: 5 Jan 2007, 10:01pm
Location: North Hertfordshire

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby drossall » 20 Jun 2020, 10:51am

touringben - or say where you are and someone may just be prepared to lend one.

roger
Posts: 154
Joined: 5 Jan 2007, 2:14pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby roger » 22 Jun 2020, 3:56pm

I could even post one.

roger
Posts: 154
Joined: 5 Jan 2007, 2:14pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby roger » 22 Jun 2020, 9:02pm

Just had a look at a body and the spanners and it seems you need two.The two ends are different sizes, and the locknut seems to be outside the cone. Anyhow, I have two if you want to borrow them.

Brucey
Posts: 43026
Joined: 4 Jan 2012, 6:25pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby Brucey » 22 Jun 2020, 9:24pm

roger wrote:Just had a look at a body and the spanners and it seems you need two.


no you certainly don't need two. See my earlier post; there is a big tab washer which prevents the adjusting cone from moving as the locknut is tightened. Similarly you don't in fact need a spanner at all.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

touringben
Posts: 19
Joined: 19 Jun 2020, 10:34pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby touringben » 2 Aug 2020, 10:37pm

roger wrote:I could even post one.


I'm so sorry for the slow response, (what with the easing of lockdown and going back into work things went a bit mad here!)

I'm based in London. If anyone could lend me one, via post or otherwise (or I'd be more than happy to buy one if someone had a spare) that would be wonderful!

Sorry again for the slow reply, it wont happen again!

julianm
Posts: 150
Joined: 6 Jun 2011, 8:13pm

Re: SunTour 'New Winner' freewheel; state of the art in 1978

Postby julianm » 4 Aug 2020, 8:20pm

An interesting read - I've got a couple as spares, which is probably a good thing as new examples with a decent range appear to go for up to £100 on Ebay!