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

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===Perfect und Pro-Compe Freilaufkörper===
===Perfect und Pro-Compe Freilaufkörper===
"Perfect" und "Pro Compe" Freilaufkörper ähneln sich bis auf die Oberfächenbehandlung. "Perfect" Freilaufkörper haben ein bronzefarbenes Finish und "Pro Compe" Freilaufkörper sind schwarz. Es gibt fünf generelle Typen, deren Dimensionen in der Tabelle folgen. Breiten sind angenäherte Werte. Sie unterscheiden sich jedoch so stark, dass man die einzelnen Freilaufkörpertypen eindeutig unterscheiden kann.


Perfect and Pro-Compe freewheel bodies are very similar, except for finish. Perfect bodies are bronze-colored, and Pro-Compe bodies are black. There are five general types, with dimensions as in the table here. Widths given are approximate but are distinct enough to identify the body types.
{| {{Prettytable}}
{| {{Prettytable}}
! Konfiguration!!Breite der <br />Keilverzahnung!!Keilverzahnte<br />Ritzel!!Gewindebreite!!Geschraubte<br />Ritzel!!Überstand
! Konfiguration!!Breite der <br />Keilverzahnung!!Keilverzahnte<br />Ritzel!!Gewindebreite!!Geschraubte<br /> Ritzel!!Überstand
|-
|-
|5-fach. 5,5mm,<br>14Z min. ||12,8mm ||3 ||11,2mm ||2 ||0
|''5-fach''. 5,5mm,<br>14Z min.
|align=center|12,8mm
|align=center|3
|align=center|11,2mm
|align=center|2
|align=center|0
|-
|-
|6-fach. 5,5mm,<br 14Z min. ||18,3mm ||4 ||11,2mm ||2 ||4mm
|6-fach. 5,5mm,<br> 14Z min.
|align=center|18,3mm
|align=center|4
|align=center|11,2mm
|align=center|2
|align=center|4mm
|-
|-
|6-fach. 5mm (Ultra),<br>14Z min. ||16,0mm ||4 ||10,2mm ||2 ||2 to 3mm
|6-fach. ''5mm (Ultra)'',<br>14Z min.
|align=center|16,0mm
|align=center|4
|align=center|10,2mm
|align=center|2
|align=center|2 bis 3mm
|-
|-
|6-fach. 5,5mm,<br />13Z min ||12,8mm ||3 ||11,2mm,<br>5,5mm ||2 + 1 ||0
|6-fach. 5,5mm,<br>13Z min
|align=center|12,8mm
|align=center|3
|align=center|11,2mm,<br>5,5mm
|align=center|2 + 1
|align=center|0
|-
|-
|6-fach. 5mm (Ultra),<br />13Z min.||11,2mm ||3 ||10,2mm,<br>5mm ||2 + 1 ||0
|6-fach. ''5mm (Ultra)'',<br>13Z min.
|align=center|11,2mm
|align=center|3
|align=center|10,2mm,<br>5mm
|align=center|2 + 1
|align=center|0
|-
|-
|}
|}

Version vom 28. Oktober 2019, 14:17 Uhr

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Als erstes dürfte sich die Frage stellen, warum man sich mit so alten Freiläufen beschäftigen sollte. Hier folgen einige Gründe.

Ein Laufrad mit einem Freilaufgewinde ist immer noch wartbar und man möchte es in Betrieb halten.

Heutige Fahrräder mit Kettenschaltung haben eine Einbauweite von 130 oder 135 mm und nahmen 8-9-10 (man wird schon schwindelig) 11-12-Fach Ritzelpakete auf. Die meisten Fahrräder der 1980er oder früherer Zeit hatten eine Einbauweite von 120 mm. Die meisten hatten Rahmen aus Stahl und man kann den Abstand zwischen den Ausfallenden vergrößern in dem man die Rahmen aufweitet. Möglicherweise will man den Rahmen aber nicht verändern. Viel 1980er und 1990er Fahrräder hatten 126 mm Einbauweite aber die Rahmen waren aus Aluminium und daher können diese Rahmen nicht aufgeweitet werden.

SunTour Perfect Schraubkranzfreilauf mit 14-38 Zähnen

SunTours Freiläufe der Serien "Perfect", "Pro Compe" und "New Winner" kann man sowohl mit 120 mm als auch mit 126 mm Mutternabstand konfigurieren. Diese Schraubkranzfreiläufe waren sehr verbreitet und wandlungsfähig. Es gibt immer noch viele von ihnen und auch Ersatzteile, um den Notwendigkeiten von Fahrradfahrern zu genügen, die einen älteren Rahmen und Laufradsatz in Betrieb halten möchten.

Anders als Freiläufe aus moderner Produktion, können SunTour Freiläufe mit fast jeder Kombination aus Ritzeln bestückt werden, die man möchte. Die engen Ritzelabstände eines SunTour Freilaufs mit Ultra Spacing indexiert mit einem Shimano siebenfach oder einem achtfach (hier aber nur mit alternativer Zugführung) Schalthebel.

Der eine signifikante Nachteil dieser Freiläufe gegenüber den aktuellen Modellen ist das fehlen von Schalthilfen, so dass Schaltvorgänge nicht so geschmeidig sind. Wenn man jedoch seine eigen Zusammenstellung von Gangabstufungen haben möchte oder der Rahmen weniger als 130mm Einbauweite hat, kann dieser Abstrich sinnvoll sein.

John Allen besitzt und fährt einige Fahrräder mit diesen Freiläufen. Er hat verschlissene Ritzelzähne wieder zurechtgefeilt, damit sie mit neuen Ersatzketten zusammenpassten.

Man kann natürlich aus historischen Gründen Interesse an diesen Freiläufen haben. Mehr historische Hintergrundinformationen findet man im Artikel SunTour Fahrradbauteile.

Siehe auch

Werbung:

Freilaufkörper

SunTour Perfect Freilaufkörper

Alle "Perfect", "Pro Compe" und "New Winner" Freilaufkörper lassen sich an ihrer starken Aufnahme für Freilaufabzieher mit zwei Nocken und am Flansch auf der Rückseite mit vier Nocken die zu den vier Einkerbungen der größeren Ritzel passen, erkennen. Zudem sind die äußeren Lagerringe entsprechend beschriftet.

Perfect und Pro-Compe Freilaufkörper

"Perfect" und "Pro Compe" Freilaufkörper ähneln sich bis auf die Oberfächenbehandlung. "Perfect" Freilaufkörper haben ein bronzefarbenes Finish und "Pro Compe" Freilaufkörper sind schwarz. Es gibt fünf generelle Typen, deren Dimensionen in der Tabelle folgen. Breiten sind angenäherte Werte. Sie unterscheiden sich jedoch so stark, dass man die einzelnen Freilaufkörpertypen eindeutig unterscheiden kann.

Konfiguration Breite der
Keilverzahnung
Keilverzahnte
Ritzel
Gewindebreite Geschraubte
Ritzel
Überstand
5-fach. 5,5mm,
14Z min.
12,8mm 3 11,2mm 2 0
6-fach. 5,5mm,
14Z min.
18,3mm 4 11,2mm 2 4mm
6-fach. 5mm (Ultra),
14Z min.
16,0mm 4 10,2mm 2 2 bis 3mm
6-fach. 5,5mm,
13Z min
12,8mm 3 11,2mm,
5,5mm
2 + 1 0
6-fach. 5mm (Ultra),
13Z min.
11,2mm 3 10,2mm,
5mm
2 + 1 0
  • The conventional 5-speed version has splines for three sprockets, and threading at a single diameter for another two. The outer ring is level with the outer body, except that a few of these bodies have a flange for a clip-on protector to keep the chain from derailing to the outside of the smallest sprocket. There is a special tandem Pro-Compe version with wider pawls, labeled "tandem" on the cover plate. The minimum sprocket size is 14 teeth.
  • 6-speed versions with 14T minimum are identifiable by the outer body's overhang past the outer ring. These freewheels take four splined sprockets and two threaded ones. A 6-speed body with a 4mm overhang, like the one in the illustration above, is designed for old-standard (5.5mm) sprocket spacing.
  • There are narrower ("Ultra") 6-speed versions, with overhang of 2mm to 3mm as shown in the photo below. These fit 6 sprockets into the space made for 5, and as mentioned are compatible with Shimano 7-speed indexing.

SunTour Pro-Compe freewheel for Ultra spacing, with 2mm overhang, 14T minimum. Freewheel with 2mm overhang

  • Some Perfect bodies -- in either 5.5mm or 5mm spacing -- have a smaller threaded diameter at the outside to take a 13-tooth sprocket. These bodies also take two threaded sprockets of the usual type and three splined sprockets, for a total of 6. If you can't find a SunTour 13-tooth sprocket to fit, a Shimano Dura Ace or 600 threaded sprocket will work. These bodies are rare and desirable. The ones for 5.5mm spacing can fit 7 sprockets with 5mm spacing if the innermost one is dished so no spacer is necessary outboard of it. This arrangement is especially useful to fit 7 sprockets on a bicycle frame with 120mm or 126mm spacing. The dished sprocket sits closer to the spokes than usual, but that is no a problem with a large-diameter sprocket.

Pro Compe freewheel that takes a 13t sprocket

Pro Compe freewheel with the rare 13t sprocket

Außenringaspekte

Classic European freewheels have an odd number of ratchet teeth and two pawls directly opposite one another, so only one pawl engages at a time. SunTour New Winner and bodies, and some Perfect and Pro Compe bodies, have an even number of ratchet teeth and two pawls directly opposite one another. As you turn the freewheel slowly backwards, you can hear it go ttick-ttick-ttick as the two pawls engage at (nearly) the same time. Unless the freewheel's bearings are adjusted just short of binding, chain pull rocks the outer body one way, then the other as the wheel turns, making a light clunk-clunk noise. The outer ring of some of these freewheels has a tendency to unscrew, probably worsened by this excess motion. If the clunk-clunk noise starts or gets worse, check right away whether the outer ring is coming loose. Twice I have had one come off completely, dumping all the bearing balls out of the freewheel. Both times, I managed to ride home after screwing the outer ringback on, taking care not to coast.

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

New Winner Freilaufkörper

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

Ritzel

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.

Suntour spacers

Dimensions are as in the table below. The diameter given is for the freewheel body. The inside diameter of threaded sprockets is about 1/2 mm smaller than the outside diameter of the threads to which they attach.. Type New Winner Code Use with: Body/ threading diameter smallest sprocket largest sprocket(s) Notes 4-spline flat A All 52mm 17 28,30, 32,34,38 File splines of Perfect sprockets to use on Pro-Compe or New Winner body. 4-spline, integral spacer V 5.5mm spacing 52mm 16 3.5mm spacer for wide (5.5mm) spacing, 4-spline, integral spacer 5.0mm spacing 52mm 16 Includes 2.7mm spacer for Ultra (5.0mm) spacing. Not used on New Winner, so no code. threaded R All 44mm 15 21 Has wide threading flange to secure splined sprockets on New Winner narrow-spaced 6 and 7-speed. threaded T All 44mm 15 19 May not have wide threading flange to secure splined sprockets on New Winner narrow-spaced 6 and 7-speed. threaded, integral spacer N 5.5mm spacing 44mm 14 Includes 3.5mm spacer threaded, integral spacer P 5.0mm spacing 44mm 14 Includes 2.7mm spacer for Ultra spacing (but 3.5mm will work on Pro Compe) threaded Perfect 40mm 13 14 Used only on the rare Perfect body with two threading diameters. Shimano 600 or Dura-Ace sprocket will work. threaded X New Winner 39mm/ 39mm 14 16 6-speed wide. Outer sprocket threads onto this one. threaded E New Winner 39mm 13 14 For 6-sp wide, threads onto X sprocket; For 5-sp, outer sprocket, attaches to body. threaded S New Winner 39mm 13 14 6-speed narrow outer sprocket, attaches to body threaded L New Winner 39mm/ 35mm 13 15 7-speed second-outermost sprocket. Outermost sprocket threads onto this one. threaded U New Winner 35mm 12 13 7-speed outer sprocket attached to next sprocket. Shimano Uniglide or track sprocket 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.

The image below shows 5 kinds of special New Winner outer sprockets and gives their threading diameters. The E sprocket is attached to the X sprocket to make a 6-speed, and directly to the body to make a 5-speed.

Special new Winner sprockets

The letter codes for the New Winner provide a nice mnemonic:

  • 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
  • 5-speed: E, T, R, A, A ; E, N, R, V, A ; E, N, 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.

Suntour spacers

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. Type Use with body Inside diameter Outside diameter Thickness Notes Spline All with 5.5mm spacing 52mm 57mm 3.5mm Steel, split ring Spline All with 5mm spacing 52mm 57mm 2.7mm Steel, split ring, or plastic, with 4 splines transition New Winner 52mm 56mm or 58mm 0.9mm Used in Ultra New Winner where the second splined sprocket does not overhang the end of the splines. transition/ threaded All 44mm 54mm 1.9mm For 5.5mm sprocket spacing. Beveled spacer must be used behind a 15T sprocket transition/ 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.

Splined sprockets on Perfect body

Perfect and Pro-Compe bodies designed for the narrower Ultra (5mm) spacing have a splined section to accommodate three or four sprockets and their narrower spacers. With some Ultra-spaced freewheels, paper-thin shims are needed in addition to the regular spacers so that the rightmost splined sprocket overhangs the splines and the threaded sprockets secure the splined ones.

With Ultra (5.0mm) spacing, the second-largest sprocket does not overhang the splines of the New Winner body, and so a special 0.9mm thick spacer allows the threaded sprockets to secure the splined ones, as shown in next photo. To engage this narrow spacer, the leftmost threaded sprocket has to have a wide flange.

New Winner freewheel with thin spacer

When building up a SunTour freewheel, it is helpful to have an ample collection of spacers salvaged from disassembled freewheels. Sutherland's Handbook for Bicycle Mechanics, 6th Edition -- still available as a CD-ROM -- includes a complete listing of the different sprockets and spacers.

Individualisierungsmöglichkeiten

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 modified sprocket, view from outsidemodified sprocket, view of inside

Angeschraubtes oder gewölbtes Ritzel innen

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.

Siehe auch

Quelle

Dieser Artikel basiert auf dem Artikel Using SunTour Perfect, Pro Compe and New Winner Freewheels von der Website Sheldon Browns. Originalautor des Artikels ist John Allen.