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

Suntour “Symmetric” friction shifters auto-trim?

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.

Suntour “Symmetric” friction shifters auto-trim?

Old 06-26-05, 01:52 PM
Senior Member
Thread Starter
Join Date: Apr 2005
Location: SoCal - on ramp to the apocalypse ;-)
Posts: 65

Bikes: Nishiki International, Bianchi Pista, Kona Coiler, Raleigh '03 Professional

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Suntour “Symmetric” friction shifters auto-trim?

I was about to dismantle my Suntour “Symmetric” friction shift levers for cleaning when I noted a rather complex appearing internal mechanism and decided to leave well enough alone. These levers mount side by side to a housing bolted to the front downtube. They are linked inside the housing by some intriguing offset cam that, as far as I can tell, trims one lever as you move the other. Have I got this right? If so this is pretty ingenious and maybe well known to you old-time Suntour fans. The levers are 1983 or thereabouts, matched to Cyclone MKII derailleurs, but my earlier ’80 version has are totally independent levers and mounts with a clamp. One nice feature I miss on the new version is the “top normal” feature of the old; see: https://www.rivbike.com/webalog/shift...urs/17107.html
Wonder why this was changed.
rokrover is offline  
Old 06-26-05, 06:37 PM
juneeaa memba!
Join Date: Oct 2003
Location: boogled up in...Idaho!
Posts: 5,632

Bikes: Crap. The box is not big enough...

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
You're right, they are self trimming and work well for seven speeds, and a b!tch to work on. I haven't tried them on anything greater than seven cogs. I seem to recall that they made both "normal" and reverse front derailleur operation...I have a couple of sets, both of which are normal, so maybe my recollections are not accurate...
luker is offline  
Old 06-26-05, 07:11 PM
Senior Member
Join Date: Oct 2004
Posts: 5,250
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 7 Times in 7 Posts
I have the "Symmetric" on a 1983ish Centurion Pro Tour 15. And, it is a nice feature. With most triples, it is difficult to avoid the chain rubbing on the gear changer cage at some point. the Symmetric moves the front cage as the chain moves from the smallest cogs to the largest cogs to avoid chain rub.

I remember someone posting about how easy it is on the 2004 Dura-Ace to "trim" the front cage to reduce chain rub. So, I suppose that means Shimano may now be catching up with the 1983 Sun Tour stuff.
alanbikehouston is offline  

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

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

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.