Über den Einsatz von SunTour Perfect, Pro Compe und New Winner Schraubkranzfreiläufen: Unterschied zwischen den Versionen

 

The freewheel can be restored with about 100 new 1/8" bearing balls -- but as the saying goes, an ounce of prevention is worth a pound of cure. Disassembly of a freewheel usually makes no sense, but this is the exception. Instructions are in our article on rebuilding freewheels. You do not have to disassmble the freewheel completely to make this modification. SunTour new Winner body

 

The New Winner body is unlike the others, and cleverly designed to take 5 or 6 sprockets in 5.5mm spacing; 6 or 7 sprockets in 5mm spacing. The outer sprocket can be as small as 13 teeth with 6 sprockets, or 12 teeth with 7 sprockets. New Winner bodies have an adjustable lockring rather than shims and generally were supplied in correct adjustment. Two of the special tools shown below, now rare, are needed to disassemble or adjust the New Winner body, but this work is very rarely necessary.

 

Not easily obtainable but usually unnecessary: SunTour New Winner tool SunTour New Winner tool

SunTour Perfect sprockets are bronze-colored, Pro-Compe sprockets are gold, and New Winner sprockets, silver. These freewheels use four-spline large sprockets, and threaded smaller ones. The teeth are 2mm thick. Exception: sprockets from the earlier-model Winner are black or gold, some are slightly thinner, and some have eight splines rather than four. The photo below is of the sprockets and spacers for the common 5-speed Perfect freewheel.

Type New

Winner

Pro-Compe or New Winner body.

threaded E New

For 6-sp wide, threads onto X sprocket; For 5-sp, outer sprocket, attaches to body.

Winner 39mm 13 14 6-speed narrow outer sprocket, attaches to body

35mm 13 15 7-speed second-outermost sprocket. Outermost sprocket threads onto this one.

threading is slightly smaller, won't work.

Except for the 16-tooth sprockets, in two widths with integral spacers, all four-spline sprockets are interchangeable, though Perfect sprockets have slightly deeper, rounded splines which may have to be filed before they will fit a Pro Compe or New Winner body. Most 44mm threaded sprockets are fully interchangeable too. 14-tooth sprockets came with two widths of integral spacers, as indicated in the table. Using an outermost 14-tooth 44mm-threaded sprocket for 5.5mm spacing on an Ultra-spaced freewheel works OK except on the New Winner 6- and 7-speeds, where it would reduce the spacing to the next outer sprocket.

The outer one or two New Winner sprockets use a threading different from other SunTour sprockets, and so sprocket availability may determine whether you will want to use a New Winner body. Only the New Winner's two innermost positions take splined sprockets, making a good sprocket progression with large sprockets hard to assemble -- but we have a workaround, keep reading.

*    7-speed: U, L, T, R, R, A, A ; U, L, P, R, R, A, A ;

*    6-speed narrow: S, T, T, R, A, A ; S, P, T, R, A, A

*    6-speed wide: E, X, T, R, A, A

==Spacer==

Let's look at the photo of sprockets and spacers of the common 5-speed Perfect freewheel again. Because of the different spacings and numbers of sprockets, Perfect and Pro Compe freewheel bodies were made in several splined, threaded and total widths. Spacers of different widths established the different sprocket spacings.

The spacer behind the outer, 15-tooth sprocket is beveled to avoid interfering with the chain.

The two leftmost spacers, between the splined sprockets, are 3.5mm thick and the sprockets are 2mm thick, for a combined spacing of 5.5mm. The outer spacers are only 1.9mm thick because the outer, threaded sprockets are thickened near the center hole for the threads. 14-tooth threaded sprockets and 16-tooth splined sprockets have integral full-width spacers. Splined sprockets with 17 or more teeth are flat and use separate spacers, as shown. Ultra spacing uses thinner spacers. The table below identifies the different spacers.

5.5mm

spacing 52mm 57mm 3.5mm Steel, split ring

5mm spacing 52mm 57mm 2.7mm Steel, split ring, or plastic, with 4 splines

58mm 0.9mm Used in Ultra New Winner where the second splined sprocket does not overhang the end of the splines.

threaded All 44mm 52mm 1.1mm For 5.0mm sprocket spacing. Beveled spacer must be used behind a 15T sprocket

The next photo shows a Perfect body with three splined sprockets and two spacers in place. The red arrow points to one of the splines. The rightmost splined sprocket overhangs the larger-diameter section of the freewheel body, as shown, so that the spacer behind the next, threaded sprocket can secure the splined sprockets.

===Scharubritzel mit mehr als 21 Zähnen===

The New Winner body takes only two splined sprockets, and threaded sprockets were sold only in sizes up to 21 teeth, requiring a big jump in size between sprockets if the splined sprockets are large. An aftermarket adapter to allow a splined sprocket in the third position was available once -- no longer -- but there is a workaround. The 15-tooth threaded sprocket's flange fits neatly into the opening in a splined sprocket with flat-top splines, and can be tack-welded onto the inside face of the larger sprocket (the side where the teeth are shorter), also serving as a spacer. The welds must not extend higher than the face of the smaller sprocket. Grind the welds down if necessary.

Splined sprocket modified into a threaded sprocket.

outside face of sprocket | inside face of sprocket

Freewheel and cassette bodies are designed so the rear derailer will clear the spokes with the smallest possible sprockets. With larger sprockets, the slant of the spokes allows an additional sprocket closer to the wheel. A dished sprocket, or one bolted onto the innermost splined sprocket, can be added without increasing wheel dishing or dropout spacing.

A dished sprocket will move the other sprockets 2 mm farther to the right, and can allow a body which was designed for 5.5 mm sprocket spacing to accommodate an additional sprocket in 5 mm (Ultra) spacing. Dishing a sprocket requires the use of a machinist's tool -- an arbor press -- and a forming template of 1/8" or 3 mm sheet metal with a round hole in the middle. The part of the sprocket which is to be bent should first be heated red hot to soften it and allowed to cool slowly, otherwise the hardened steel may crack. Avoid overheating the teeth.

On my Cannondale bicycle with 126 mm dropout spacing, I have a 7-speed Ultra-spaced freewheel with the largest sprocket dished, on a Pro-Compe 6-speed body. Because the sprocket is dished, the wheel dishing is more moderate than it would normally be, and so the wheel is stronger.

 

 

Thanks to Yellow Jersey bicycles for review of this article, and an article wth more information about these freewheels.

* [http://www.yellowjersey.org/stfw.html Mehr Informationen zu SunTour Schraubkranzfreiläufen bei Yellow Jersey (englsich)]

Dieser Artikel basiert auf dem Artikel [https://www.sheldonbrown.com/suntour-freewheel.html Using SunTour Perfect, Pro Compe and New Winner Freewheels] von der Website  [http://sheldonbrown.com Sheldon Browns]. Originalautor des Artikels ist [[John Allen]].