Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

9 Speed Campy Shifter on 7 Speed Sun Tour New Winner Freewheel

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

9 Speed Campy Shifter on 7 Speed Sun Tour New Winner Freewheel

Old 01-03-14, 09:12 PM
  #1  
avhed
Senior Member
Thread Starter
 
Join Date: May 2009
Posts: 434
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
9 Speed Campy Shifter on 7 Speed Sun Tour New Winner Freewheel

Would this work? Campy width is 4.55mm. The top 2 spaces on the New Winner is 4.5mm. .2mm will be ground off the middle 2 spaces. .5 mm off the bottom 2.
avhed is offline  
Old 01-03-14, 09:58 PM
  #2  
SuperLJ
"part timer"
 
SuperLJ's Avatar
 
Join Date: Oct 2008
Location: Tidewater VA
Posts: 587

Bikes: 1975 Raleigh Gran Sport, 1978 Bertin C35, 1982 Trek 614, 1983 Trek 620, 1984 Nishiki Seral, 1995 Mercian KoM, 1998 Fisher HKEK, 2000 Rivendell RS, 2001 Heron Touring, 2016 Nobilette Custom

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 104 Post(s)
Liked 83 Times in 38 Posts
Maybe, but only if you're planning to use a Campagnolo 9-speed derailleur.
SuperLJ is offline  
Old 01-03-14, 10:20 PM
  #3  
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Posts: 8,029

Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 1078 Post(s)
Liked 510 Times in 364 Posts
You'll want to be careful about discerning spacing from cog widths and spacer thicknesses, since the cogs have asymmetric machining features on the Suntour freewheels.

You'll certainly also need to use 9-speed chain, which offers the most-forgiving shifting on ALL Suntour and Shimano freewheels anyway.

I'm kind of thinking that your choice of cog sizes will affect how responsive your shifting is, and may need to be mellowed with some extra chain gap (increased b-tension) if the chain wants to overshift over your modified cog spacing.

The Campag Ergo shifters are also less controlled in terms of indexing than are STI shifters, in that Campag's Ergo indexing is forced-spring-detented in both directions, not controlled by actual ratcheting at the level of the shift spool as are Shimano's.
This means that I expect your creation to be very sensitive to both cabling quality and operator technique.

Lastly, shifters that allow shifting while off of the saddle are designed to be used with very robust, HG-style chain and sprockets, lest the rider be thrown off line by any slippage resulting from using old-tech and/or mis-matched parts. In short, this sort of conversion could be hazardous and annoying to a rider not willing to accomodate it's finicky nature.
dddd is offline  
Old 01-03-14, 10:49 PM
  #4  
Roger M 
Senior Member
 
Roger M's Avatar
 
Join Date: May 2010
Location: Snohomish, WA.
Posts: 2,374
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 209 Post(s)
Liked 433 Times in 166 Posts
This may or may not be of interest, but I rode with this for at least 1000 miles without issue:

8 speed ergo shifters
8 speed Campagnolo racing triple derailleurs
7 speed Suntour freewheel
8 speed chain

With no modifications to any parts, everything indexed properly.
Roger M is offline  
Old 01-03-14, 11:33 PM
  #5  
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Posts: 8,029

Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 1078 Post(s)
Liked 510 Times in 364 Posts
That's interesting, but not too surprising.

Especially since Shimano's 7s spacing was pretty close to Suntour's and is known to index quite well with a Campag-8 system.

And some Suntour freewheels from the early 1990's actually are Shimano-spaced, from when Suntour introduced Plug-N-Play compatible componentry in an effort to stay relevent in the market.

In any case, I've mixed and matched various combinations and usually only felt the spacing error when using the 2 largest cogs on a Suntour freewheel with a Shimano shifter and derailer. They are indeed more tightly spaced between the three largest cogs.
Whether the mis-matched parts will run quietly depends on things like the chain gap as well as the chain width, with narrower chains being more forgiving.
I built several HG cassettes with spacers narrowed as needed to work with Suntour Command shifters, and it didn't take much more than a few thou to be sanded off of the spacers to shift almost like an all-shimano bike. It also seemed to help to tighten the indexing force up on the shift lever spool.
dddd is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
badger_biker
Classic & Vintage
120
08-01-12 04:41 AM
jonwvara
Classic & Vintage
22
09-17-11 09:40 PM
Pars
Classic & Vintage
15
06-24-10 07:57 PM
vanbiker
Bicycle Mechanics
9
03-20-10 08:30 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.