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PostPosted: Thu Feb 11, 2010 11:59 am 
Retro Guru

Joined: Sat Aug 15, 2009 9:30 pm
Posts: 413
Location: Leighton Buzzard
Were all old freewheels suitable for index shifting?
As I need to source a slightly larger 7 speed freewheel for cross.

If anyone wants to swap an old but hardly used Sachs freewheel, I think 12-21 for something up to 25T I'd like to hear from you.


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PostPosted: Thu Feb 11, 2010 12:16 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2096
Location: Sheffield, top city
shimano, maillard and sachs I think are similar. not sure if suntour matches and I'd avoid the cheap far east budget freewheels.


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PostPosted: Thu Feb 11, 2010 12:20 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26178
Location: Moomin Valley
from the bodging and faffing I've done over the years, the gap between 5/6/7/8 spd cogs has been pretty constant.

The ancient Sachs 6spd freewheel I've used indexed perfectly well with a Shimano 6spd d/t lever until I changed to a friction bar end lever.

The only issue I can think of is the cogs without any sort of tooth manipulation (like shimano's hyperglide) - Some Sachs freewheels I used had little angles on the teeth to allow for smoother shifting. My older Sachs doesnt which results in a loud 'clack clack clack, shift'.

a quick punt around fleabay (not quite your size but with hyperglide style shifting):

http://cgi.ebay.co.uk/Sunrace-7speed-ro ... _500wt_956

and some random others:

http://cgi.ebay.co.uk/GREAT-7-SPEED-SCR ... 500wt_1182

http://cgi.ebay.co.uk/Sunrace-7speed-fr ... _500wt_956

6 spd:

http://cgi.ebay.co.uk/Maillard-700-Sipd ... 500wt_1182

http://cgi.ebay.co.uk/Maillard-700-Sipd ... 500wt_1182


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PostPosted: Thu Feb 11, 2010 12:34 pm 
Retro Guru

Joined: Sat Aug 15, 2009 9:30 pm
Posts: 413
Location: Leighton Buzzard
That Sunrace would do.

It's got 'Fluid Drive Technology' what could go wrong :?


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PostPosted: Thu Feb 11, 2010 12:56 pm 
Retro Guru

Joined: Wed May 27, 2009 10:41 am
Posts: 638
The sunrace one will be ok, I swapped out an old sachs for a sunrace recently and didn't have to adjust anything. 'Fluid Drive Technology' is indeed a treat to behold. Or rather it works fine, much smoother gear chain than the sachs that didn't have any hyperglidey type of thing.


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PostPosted: Mon Feb 15, 2010 10:18 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8220
Location: New Forest, UK
The older freewheels have longer teeth so don't like indexing systems so well.

5/6 speed have 5.5mm pitch between gears, whereas 7 is 5.0 and 8 is 4.8mm (Shimano) or 5.0 (Campag).


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