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 Post subject: Screw-On 8sp Blocks?
PostPosted: Wed Nov 03, 2010 11:55 am 
Old School Hero

Joined: Tue Feb 16, 2010 1:09 pm
Posts: 221
Location: northampton
Hi,
Is there such a thing? 8 speed screw on block?
I'm converting a lovely old Concorde for a friend to early 8sp Record Ergos (to make it more user friendly but still fairly period).
Or do I need to just run with a 7sp block and have a 'spare' click on the changer?


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 Post subject:
PostPosted: Wed Nov 03, 2010 12:09 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26157
Location: Moomin Valley
yes but expensive in road sizes

http://cgi.ebay.co.uk/Sachs-8spd-Freewh ... 3cb201bfb7


google:

http://www.google.co.uk/products?hl=en& ... a=N&tab=if


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 Post subject:
PostPosted: Wed Nov 03, 2010 12:20 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2094
Location: Sheffield, top city
discussion here ...

http://www.retrobike.co.uk/forum/viewtopic.php?t=120400


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 Post subject:
PostPosted: Wed Nov 03, 2010 12:44 pm 
Old School Grand Master
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Joined: Wed Jul 25, 2007 2:04 pm
Posts: 3364
Location: Completely in the dark, thanks to me good mate Terry....
Might struggle a bit to find a Campag-friendly one, too - those that are still on the market (e.g. Zenith) tend to suit Shimano and later Sachs-Huret set-ups.

David


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 Post subject:
PostPosted: Wed Nov 03, 2010 3:35 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Location: Moomin Valley
I was led to believe that 8spd campagnolo and shimano share similar cassette spacing hence 'shimergo'


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 Post subject:
PostPosted: Wed Nov 03, 2010 4:02 pm 
Old School Grand Master
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Joined: Wed Jul 25, 2007 2:04 pm
Posts: 3364
Location: Completely in the dark, thanks to me good mate Terry....
They are pretty close, actually: Campag is 5.0mm spacing, Shimano is 4.8mm. Sachs used to be identical to Campag, but their screw-on blocks made after 1998 went over to the Shimano standard. For 8, 9 and 10 speed set-ups, in every instance the Shimano spacing is about 0.2mm closer together. Doesn't sound much but potentially adds up to an indexing headache across the full range of a block. If you're on friction levers, mind, anything goes!

David


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 Post subject:
PostPosted: Thu Nov 04, 2010 10:55 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
Everybody was the same on 7s (5.0mm) but Campag stayed with 5 for 8 speed while Shimano went to 4.8mm.


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 Post subject:
PostPosted: Thu Nov 04, 2010 1:47 pm 
Old School Grand Master
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Joined: Tue Nov 18, 2008 10:49 am
Posts: 4061
Location: A veritable floating palace
I'm sure someone would have said this eventually, but why?

8speed freewheels were really the death of freewheel hubs, and really what gave them the bad name they have now.


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 Post subject:
PostPosted: Thu Nov 04, 2010 1:52 pm 
Old School Grand Master
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Joined: Wed Jul 25, 2007 2:04 pm
Posts: 3364
Location: Completely in the dark, thanks to me good mate Terry....
hamster wrote:
Everybody was the same on 7s (5.0mm) but Campag stayed with 5 for 8 speed while Shimano went to 4.8mm.


Based on that the OP should be OK with their suggestion of using 8sp Ergo levers and losing a "click" - there are Regina indexed 7sp freewheels to suit Campag Syncro transmissions doing the rounds on eBay, or if not a modern Shimano or Zenith product ought to suit too.

David


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 Post subject:
PostPosted: Thu Nov 04, 2010 2:36 pm 
retrobike rider
retrobike rider

Joined: Mon Oct 25, 2010 9:32 pm
Posts: 137
Location: Apeldoorn (NL)
8 speed freewheels are used these days on BionX driven E-bikes (as those by Trek) and probably some others.
Unfortunately the gearing is MTB like 13-32, which would not work well with older Campagnolo derailleurs. Quality is not great either.
I might have an old Regina 8-speed freewheel somewhere in road gearing.


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