Dura Ace RD-7402 Refurbish
#1
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
Dura Ace RD-7402 Refurbish
I been into polishing old badly scuffed up parts for a couple years now, typically I get the parts for a good deal & I really like the results. In the 80s I leaned more the campy when it came to road components (still do) but always liked Shimano as well. I purchased a tri-color (600) to use on my road bike when I got tired of C Record friction (way back in the early nineties) and have come across a second tr-color since then, I'm using them both on some 90s mountain bikes. I always like Dura Ace but not as much as C Record. I saw an RD-7402 on Craigslist for $20 including a matching FD (don't really have a use for it) and jumped at it. I have 93' Kona Kilauea which has a smaller block freehub (23 max?) which is very light (around 23lbs) and thought it would be a great way to show off a polished old school Dura Ace RD (7 speed thumbies).
I'm surprised I never heard about the uniqueness of 7400 series Dura Ace rear shifting until now...
Funny how Shimano kept it Dura Ace incompatible with all other Shimano shifting for so long. Guess I could try one of those microshift 9 speed thumbshifters, or maybe just go friction! No biggie, it'll get used somehow.
Though I would share some of my handy work:
Before:
After:
I'm surprised I never heard about the uniqueness of 7400 series Dura Ace rear shifting until now...
Funny how Shimano kept it Dura Ace incompatible with all other Shimano shifting for so long. Guess I could try one of those microshift 9 speed thumbshifters, or maybe just go friction! No biggie, it'll get used somehow.
Though I would share some of my handy work:
Before:
After:
Likes For retrodude:
#2
Junior Member
Man you do know how to polish...should've sent some of my stuff to you. I have three sets of DA 7400, 7402 is 8 speed and you can easily use 9 speed downtube shifters such as these with it, just not having 9th gear. link HERE
If you are after a brifter set, they can be a tad expensive though, but sometimes they pop up in Europe for less than 100$
Good luck
If you are after a brifter set, they can be a tad expensive though, but sometimes they pop up in Europe for less than 100$
Good luck
#3
Senior Member
Join Date: Jun 2006
Posts: 20,305
Mentioned: 130 Post(s)
Tagged: 0 Thread(s)
Quoted: 3464 Post(s)
Liked 2,828 Times
in
1,995 Posts
The reworked mechanism appears to have the black cartouche depressed and filled with paint around the text- the originals I have have that black area equal to a silk screened region...
how was that area controlled?
how was that area controlled?
#4
señor miembro
Join Date: Dec 2018
Location: Pac NW
Posts: 6,624
Bikes: '70s - '80s Campagnolo
Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 3883 Post(s)
Liked 6,476 Times
in
3,205 Posts
Likes For SurferRosa:
#5
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
I wasn't sure how it would react so I applied a super sticky rubber tape over it during the chemical anodization removal process to ensure it was not in contact. For the sanding I simply used green painters tape cut precisely to cover it.
Definitely worth protecting!
#6
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
#7
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
Man you do know how to polish...should've sent some of my stuff to you. I have three sets of DA 7400, 7402 is 8 speed and you can easily use 9 speed downtube shifters such as these with it, just not having 9th gear. link HERE
If you are after a brifter set, they can be a tad expensive though, but sometimes they pop up in Europe for less than 100$
Good luck
If you are after a brifter set, they can be a tad expensive though, but sometimes they pop up in Europe for less than 100$
Good luck
Takes a lot of patience, thanks for the tips, still undecided where to make use if it, maybe just set it next the the wives silver (LOL)?
#8
Senior Member
Join Date: May 2008
Location: Fredericksburg, Va
Posts: 9,579
Bikes: '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8
Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 1607 Post(s)
Liked 2,216 Times
in
1,103 Posts
Likes For SJX426:
#9
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
Likes For retrodude:
#10
Senior Member
Join Date: May 2008
Location: Fredericksburg, Va
Posts: 9,579
Bikes: '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8
Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 1607 Post(s)
Liked 2,216 Times
in
1,103 Posts
retrodude Thanks! I have a couple of old parts that are not anodized that I hit with Mothers every several years. All my bikes are kept in climate controlled environment when not in use. It works.
__________________
Bikes don't stand alone. They are two tired.
Bikes don't stand alone. They are two tired.
#11
Senior Member
Join Date: Oct 2005
Location: SW Ohio
Posts: 3,682
Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1163 Post(s)
Liked 442 Times
in
315 Posts
A lot of very ugly clear anodized silver, road rashed parts could be rescued if more folks would embark on some of your procedures!
#12
señor miembro
Join Date: Dec 2018
Location: Pac NW
Posts: 6,624
Bikes: '70s - '80s Campagnolo
Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 3883 Post(s)
Liked 6,476 Times
in
3,205 Posts
Interesting choice as a deanodizing agent that I haven't heard before. Looking at Zep's huge catalogue of products, I wonder if that's the best choice. Do you mix it with hot water?
#13
SE Wis
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,509
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2744 Post(s)
Liked 3,390 Times
in
2,053 Posts
I had to order the Simichrome on-line as I could not find it for sale in Canada. I have used this for derailleurs, cranks and seatposts with good results. There will be a concern that the aluminum is unprotected afterward which is valid. My bikes are kept indoors and kept very clean so it has not been an issue for me even a couple of years after the fact
A coat of auto wax helps keep the shine
#14
Disraeli Gears
Impressive. The $64,000 question is: was the derailleur disassembled to do this (removing the pivot pins)? If so, how, and how was reassembly done? If not, then how to keep abrasives out of the works (the pivoting parts that wear against each other)?
#15
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
I just use it full concentrated form (no diluting), I had dabbled in removing anodization years ago with drano and always worried it was too corrosive, I feel this works just as well at full strength and appears to do no harm, I always try to remove all rubber or plastic parts
#16
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
The derailleur was disassembled to it's smallest parts excluding pivot pins (I would be scared to try). Basically the three parts to go into the Zep were inner & outer pulley cages and the main body with logo protected (just to be safe). I make sure to rinse everything thoroughly in hot water after a couple minutes in the Zep bath.
#17
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
#18
Senior Member
Join Date: Jun 2014
Location: Ontario, Canada
Posts: 4,624
Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1324 Post(s)
Liked 927 Times
in
640 Posts
Beautiful!
I have a pair of Shimano Exage clipless pedals that I was able to remove most of the grey anodizing from by carefully scraping it with a very sharp knife. I then use various files to remove the mold seam lines and to give the pedals a better contour. I then used various grits of wet/dry paper and polishing cloth by hand to give the pedals a high lustre polish.
This was the result.
Would the stuff you used to strip the anodizing harm the springs inside these pedals or the rsin or hard plastic end piece that pivots?
Thanks and cheers
I have a pair of Shimano Exage clipless pedals that I was able to remove most of the grey anodizing from by carefully scraping it with a very sharp knife. I then use various files to remove the mold seam lines and to give the pedals a better contour. I then used various grits of wet/dry paper and polishing cloth by hand to give the pedals a high lustre polish.
This was the result.
Would the stuff you used to strip the anodizing harm the springs inside these pedals or the rsin or hard plastic end piece that pivots?
Thanks and cheers
#19
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
Beautiful!
I have a pair of Shimano Exage clipless pedals that I was able to remove most of the grey anodizing from by carefully scraping it with a very sharp knife. I then use various files to remove the mold seam lines and to give the pedals a better contour. I then used various grits of wet/dry paper and polishing cloth by hand to give the pedals a high lustre polish.
This was the result.
Would the stuff you used to strip the anodizing harm the springs inside these pedals or the rsin or hard plastic end piece that pivots?
Thanks and cheers
I have a pair of Shimano Exage clipless pedals that I was able to remove most of the grey anodizing from by carefully scraping it with a very sharp knife. I then use various files to remove the mold seam lines and to give the pedals a better contour. I then used various grits of wet/dry paper and polishing cloth by hand to give the pedals a high lustre polish.
This was the result.
Would the stuff you used to strip the anodizing harm the springs inside these pedals or the rsin or hard plastic end piece that pivots?
Thanks and cheers
#20
Newbie
Dumb question: Why do you need to remove the anodized coating to polish it? The anodization is a protective coating, right? But I'm guessing it's hard and resists being rubbed smooth, I guess?
What is the drawback to removing that coating, it's more prone to scratching? I assume rust isn't an issue since it's aluminum.
Sorry I'm jumping in so late to this discussion, I'm just so impressed how you can bring an old part back to life like that.
What is the drawback to removing that coating, it's more prone to scratching? I assume rust isn't an issue since it's aluminum.
Sorry I'm jumping in so late to this discussion, I'm just so impressed how you can bring an old part back to life like that.
#21
Junior Member
Thread Starter
Join Date: Nov 2018
Location: Burnaby, British Columbia
Posts: 167
Bikes: 1984 & 1990 Marinoni Specials - 1990 Bianchi Sika - 1993 Cannondale M800 - 1996 GT Zaskar - 1993 Kona Kilauea - 1987 Ritchey Ascent - 1996 Rocky Mountain Vertex - 2008 Kona Dogma - 1976 Schwinn Suburban - 1994 Kuwahara Makai
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Liked 203 Times
in
58 Posts
Dumb question: Why do you need to remove the anodized coating to polish it? The anodization is a protective coating, right? But I'm guessing it's hard and resists being rubbed smooth, I guess?
What is the drawback to removing that coating, it's more prone to scratching? I assume rust isn't an issue since it's aluminum.
Sorry I'm jumping in so late to this discussion, I'm just so impressed how you can bring an old part back to life like that.
What is the drawback to removing that coating, it's more prone to scratching? I assume rust isn't an issue since it's aluminum.
Sorry I'm jumping in so late to this discussion, I'm just so impressed how you can bring an old part back to life like that.