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

Dura Ace STI Options

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.

Dura Ace STI Options

Old 06-07-15, 09:00 AM
  #1  
UKFan4Sure
Useless Member
Thread Starter
 
Join Date: Jun 2015
Location: Louisville, KY
Posts: 744
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Liked 168 Times in 110 Posts
Dura Ace STI Options

I have been reading that Shimano did not have a Dura Ace 7-speed STI Brifter. Can I find an 8-speed 7400 series and make that work for 7-speed by setting the stops to limit the travel?

I've been digging, but ultimately decided a quick authoritative answer lies here, so stop with the messing around.

Thanks.
UKFan4Sure is offline  
Old 06-07-15, 10:04 AM
  #2  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,510
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 665 Post(s)
Liked 296 Times in 194 Posts
Originally Posted by UKFan4Sure View Post
I have been reading that Shimano did not have a Dura Ace 7-speed STI Brifter. Can I find an 8-speed 7400 series and make that work for 7-speed by setting the stops to limit the travel?

I've been digging, but ultimately decided a quick authoritative answer lies here, so stop with the messing around.

Thanks.
No. The cog spacing is different between 7-speed and 8-speed. It might come close if things are perfectly aligned and you fudge the adjustment to be perfect at the middle of the cluster, but I bet it won't.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline  
Old 06-07-15, 10:08 AM
  #3  
UKFan4Sure
Useless Member
Thread Starter
 
Join Date: Jun 2015
Location: Louisville, KY
Posts: 744
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Liked 168 Times in 110 Posts
So it seems that nothing Dura-Ace STI will work with this 7-speed set-up, then. Oh well. I guess I'd better get reacquainted with the downtube shifters then.
UKFan4Sure is offline  
Old 06-07-15, 10:12 AM
  #4  
Chrome Molly 
Senior Member
 
Chrome Molly's Avatar
 
Join Date: Jan 2012
Location: Forksbent, MN
Posts: 3,271

Bikes: Yes

Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 301 Post(s)
Likes: 0
Liked 12 Times in 12 Posts
In your shoes, I'd try a Campy Athena 11 shifter. If you do the math on the cable pull ratios, it seems like it would work just fine with your old DA7400 RD and a 7 speed cassette. Haven't done it, but would think that's your cheapest option if you order the shifters from someplace like Ribble.

8 speed STI shifters go for large $'s considering their age, and the fact that they are not rebuildable (somewhat risky). Also the 8 speed cog spacing is different than 7. Probably workable, but not going to be ideal for the $'s and dialing it in would require.
Chrome Molly is offline  
Old 06-07-15, 10:18 AM
  #5  
UKFan4Sure
Useless Member
Thread Starter
 
Join Date: Jun 2015
Location: Louisville, KY
Posts: 744
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Liked 168 Times in 110 Posts
Thanks, everyone for the help.
UKFan4Sure is offline  
Old 06-07-15, 12:36 PM
  #6  
Marvelousmarkie
Senior Member
 
Marvelousmarkie's Avatar
 
Join Date: Mar 2015
Posts: 127
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
8 Speed shifters and seven speed cogs? No problem.
Attached Images
File Type: jpg
image.jpg (84.8 KB, 36 views)
Marvelousmarkie is offline  
Old 06-07-15, 01:26 PM
  #7  
himespau 
Senior Member
 
himespau's Avatar
 
Join Date: Jun 2008
Location: Louisville, KY
Posts: 11,716
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 2475 Post(s)
Liked 1,041 Times in 613 Posts
Originally Posted by Marvelousmarkie View Post
8 Speed shifters and seven speed cogs? No problem.
Yeah but wasn't DA cable pull different than the cable pull of the rest of the lineup at that time? Like DA 8 was the same as 9 speed for 600, 105 etc, and DA7 was the same as 600/105 8 speed? Or am I remembering that backwards?

My solution was to get some Kelly Take-offs, which I was going to run with my DA 8 speed downtube shifters. Then I stupidly decided I wanted to go 10 speed so I got 10 speed downtube shifters instead. Wish I'd stuck with the original plan of 8 or gone with 9 as the 10 speed downtube shifters don't have a friction option for when stuff gets banged out of whack.
himespau is offline  
Old 06-07-15, 03:27 PM
  #8  
b dub 
CL Addict
 
b dub's Avatar
 
Join Date: Oct 2007
Location: Evanston, IL
Posts: 1,046

Bikes: '50s Leon Cattrysse - late 50s Raleigh Lenton Sports - 1960/61 Raleigh Lenton Grand Prix - '72 Canadian Tire Company Supercycle - '74 Raleigh International - '83 Nishiki Cresta - '84 Centurion Turbo - '86 v. Herwerden (Chesini) - '87 Specialized Sirr

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 60 Post(s)
Liked 64 Times in 43 Posts
Originally Posted by Chrome Molly View Post
In your shoes, I'd try a Campy Athena 11 shifter. If you do the math on the cable pull ratios, it seems like it would work just fine with your old DA7400 RD and a 7 speed cassette. Haven't done it, but would think that's your cheapest option if you order the shifters from someplace like Ribble.

8 speed STI shifters go for large $'s considering their age, and the fact that they are not rebuildable (somewhat risky). Also the 8 speed cog spacing is different than 7. Probably workable, but not going to be ideal for the $'s and dialing it in would require.
The Shimano SL-BS77 bar end shifters are plentiful on Ebay for about $80 or less.
__________________

Last edited by b dub; 06-07-15 at 03:32 PM.
b dub is online now  
Old 06-07-15, 06:23 PM
  #9  
RobbieTunes
Banned
 
Join Date: Dec 2007
Posts: 27,297
Mentioned: 34 Post(s)
Tagged: 1 Thread(s)
Quoted: 378 Post(s)
Liked 1,370 Times in 884 Posts
You could try 8-sp Dura Ace STI's with a spacer, but you'd have to learn to live with a little clickety-clack. There is plenty of play in an 8-sp chain, and it should work OK. Not perfect, and may irritate you from time to time, but it should work OK.

That is, if you have some 8-sp Dura Ace STI's. They can be rebuilt, but only by a couple of people who have the parts, and will cost a bit. The hoods are notoriously rare, and notoriously fragile, so if you have everything else you need, and want this to happen, it can, but if you don't, it's a fairly long road to travel.

Me, I'm just waiting for norskagent to decide the 8-sp Dura Ace STI group on his Merckx won't work in the mountains......
RobbieTunes is offline  
Old 06-07-15, 08:02 PM
  #10  
icepick_trotsky 
Aspiring curmudgeon
 
icepick_trotsky's Avatar
 
Join Date: Aug 2014
Location: Saint Louis
Posts: 2,667

Bikes: Guerciotti, Serotta, Gaulzetti

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Is there no travel agent solution to the cable pull problem?

if you don't like the down tube shifters @UKFan4Sure, get some of these bar end pods and pop the shifters right in.
Silver Bar End Shifter Pods Mounts (Pair) - 17068
__________________
"Party on comrades" -- Lenin, probably
icepick_trotsky is offline  
Old 06-07-15, 08:51 PM
  #11  
Soody
Senior Member
 
Soody's Avatar
 
Join Date: Mar 2015
Location: New Zealand
Posts: 583

Bikes: Gunnar crosshairs, F Moser, Ken Evans, Pete Tansley, Rocky Mountain Summit, Cinelli mtb

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 92 Post(s)
Liked 83 Times in 48 Posts


Rear Shifting | CTC

+1 to 11 speed campy ergos

Even my 8 speed campy shifters say 'carbon' on them, it will look pretty cool.
Soody is offline  
Old 06-08-15, 04:34 AM
  #12  
RobbieTunes
Banned
 
Join Date: Dec 2007
Posts: 27,297
Mentioned: 34 Post(s)
Tagged: 1 Thread(s)
Quoted: 378 Post(s)
Liked 1,370 Times in 884 Posts
I just realized I have no idea how to read that chart.
Which may well explain why I always match my shifters, RD's, and cassettes.
Some things are better left to grown-ups.
RobbieTunes is offline  
Old 06-08-15, 05:01 AM
  #13  
brandon98
Senior Member
 
brandon98's Avatar
 
Join Date: Mar 2010
Location: Columbia County, Georgia
Posts: 286

Bikes: Schwinns: Paramount (Waterford), Peloton (1986 and 1999), 1987 Super Sport. Offbrand bikes: Bianchi Intenso, Diamondback Interval TG (Ironman), Peugeot Triathlon, Masi CX

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 35 Post(s)
Liked 4 Times in 4 Posts
Originally Posted by RobbieTunes View Post
I just realized I have no idea how to read that chart.
Which may well explain why I always match my shifters, RD's, and cassettes.
Some things are better left to grown-ups.
Key actionable takeaways:
-A Campy 10 shifter will shift a Shimano 8 Speed drivetrain perfectly (Shimano RD and cogs). Last 2 clicks dialed out.

-A Campy 11 shifter will shift a Shimano 9 speed drivetrain very well (Shimano RD and cogs). Last 2 clicks dialed out.

-A Shimano 10 speed shifter with a 7400 series (old dura-ace oddball ratio) RD will shift a standard 9 speed Shimano cogset. Last click dialed out.

The rest is minutiae, factoids, and "oh, that's nice".

B

Last edited by brandon98; 06-08-15 at 05:02 AM. Reason: forgot stuff
brandon98 is offline  
Old 06-08-15, 06:40 PM
  #14  
RobbieTunes
Banned
 
Join Date: Dec 2007
Posts: 27,297
Mentioned: 34 Post(s)
Tagged: 1 Thread(s)
Quoted: 378 Post(s)
Liked 1,370 Times in 884 Posts
Army people, always teasing the Marines....
RobbieTunes is offline  
Old 06-08-15, 08:01 PM
  #15  
masi61
Senior Member
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 2,865

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 720 Post(s)
Liked 140 Times in 106 Posts
Originally Posted by UKFan4Sure View Post
I have been reading that Shimano did not have a Dura Ace 7-speed STI Brifter. Can I find an 8-speed 7400 series and make that work for 7-speed by setting the stops to limit the travel?

I've been digging, but ultimately decided a quick authoritative answer lies here, so stop with the messing around.

Thanks.
Which drivetrain components are you most wanting to continue to utilize? Do you have a dura ace 7 speed freewheel or cassette? Do you have a 7400 rear derailleur? Do you already own the 7400 STI 8 speed brifters? Just curious because, depending on your answer, this can give us readers more information in order to make some helpful suggestions. Did you consider mounting some 7400 downtime shift levers on a pair of Retroshift (now call Genavaille if i'm not mistaken) cyclocross shifter pods? I'm running a 7400 Uniglide rear cassette hub with a triple Ultregra 9 speed crank and a 105 SC medium cage rear derailleur and using 105 SC downtime indexing levers on the retroshift pods. Kind of a fun set up. I expected it to work perfectly but for some reason I do get some clackety clack while in the big chainring and some of the bigger cogs on the cassette. It appears to be a rear derailleur hanger alignment issue. I purchased the Park Tools derailleur alignment jig and checked my measurements as carefully as possible and was able to improve my shifting some but still it lacks the perfect spot on precision through the entire range that I would prefer.
masi61 is offline  
Old 06-08-15, 08:41 PM
  #16  
Marvelousmarkie
Senior Member
 
Marvelousmarkie's Avatar
 
Join Date: Mar 2015
Posts: 127
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Dura Ace timeline
Marvelousmarkie is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
sballent
Bicycle Mechanics
2
04-30-15 08:47 AM
poke em
Classic & Vintage
7
01-26-14 03:45 PM
djhep
Bicycle Mechanics
7
05-21-11 11:04 PM
RFC
Classic & Vintage
12
10-13-10 05:10 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.