Convert Sachs 8sp freewheel to 7sp?
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Convert Sachs 8sp freewheel to 7sp?
I have a Sachs 8sp freewheel. My understanding is that it's possible to convert it to 7sp. Before I start to tear it apart and screw something up, is there a simple explanation? Do I need to source any extra cogs?
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If the outside sprocket just screws into the second, a pair of chainwhips and some grunting will do the trick; so that part is simple.
After that you really ought to re-space the hub; get that right side as close to the dropout as you can. You may well have an axle that is too long, so substituting a shorter, or the procrustean method will fix that.
After that you really ought to re-space the hub; get that right side as close to the dropout as you can. You may well have an axle that is too long, so substituting a shorter, or the procrustean method will fix that.
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Thanks. The freewheel isn't on a hub, so that's not an issue. So, just unwind the outer cog? That sounds easy enough.
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Yes, I don’t remember how many of the cogs thread on, but it’s at least the first two.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '82 Colnago Super, '95 Gios Compact Pro, '95 Carrera Zeus, '84 Basso Gap, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, '84 Paletti Super Prestige, Heron Randonneur
#5
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Yep, just unscrew the outer cog and you have a 7. I have a pile of outer cogs from Sachs Freewheels that have never touched a chain. Used to buy 8s when they were available and they became 7s before they ever went on a bike.