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Dura Ace 7300 AX, is it any good? Use it or upgrade on 3Rensho.

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Dura Ace 7300 AX, is it any good? Use it or upgrade on 3Rensho.

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Old 07-04-12, 08:08 PM
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tmh657
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Dura Ace 7300 AX, is it any good? Use it or upgrade on 3Rensho.

I picked up a 3Rensho that has mostly DA 7300 AX. I had never seen it before and some of it looks very strange. I would guess that a customer buying a Super Record Export would put whatever he wanted on it and this one had the 7300.

The few miles I put on it were not very impressive as far as the components. The crank looks good. I don't know if I could find brake pads to fit and get the shifting all dialed in so the question is do I let the 7300 go and use something else? I suppose that would be Super Record. It does not have a DX front derailleur. It's Campagnolo. Hubs are Record with Mavic MA30 rims.

Frame is straight with no dents. Has some bubbling paint and a few rust spots. I think it will be pretty when brought back to life.
A pro level repaint is out of the question. Too many $$$. The headset is toast so it has to be replaced. Opinions would be appreciated.








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Old 07-04-12, 08:59 PM
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What are those brakes ?
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Old 07-04-12, 09:07 PM
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Originally Posted by tmh657 View Post
Opinions would be appreciated.

Hang on to that frameset for dear life.


I've been looking at 7400 groups, they are really sleek and I read that they ride smoooooth
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Old 07-04-12, 09:10 PM
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Dura Ace AX brake calipers. AS mentioned, odd looking huh?
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Old 07-04-12, 11:43 PM
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wow, that's a rare bird, nice find

tough call because it's so cool in the "you don't see one of those every day" sense, but the rideability at this point seems on the low side

if money is an issue for repaint you can always give Allan Wanta a call. I'm pretty sure he's the cheapest in the business, he's relatively local to you, and his work speaks for itself. http://wantaframes.com/Repaintpage.html
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Old 07-05-12, 06:57 AM
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This is a great score.

One of the few Japanese bikes/components that I covet, but covet I do, badly. Those AX brakes are a crime to set up, get someone to hold the calipers in place (clamps/zip ties don't work too well due to the odd shape), so you have both hands for the nut and wire.

This frame is in far too nice shape to repaint it. remove the rust gently, clean, wax. That's all.
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Old 07-05-12, 07:25 AM
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the way the cable is routed for the RD is awesome
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Old 07-05-12, 07:32 AM
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Very cool bicycle.

The one I rode and owned many years ago was a bit of a handful in the handling department.

Not necessarily twitchy, but you had to pay attention and stay on top of things.

Especially on descents.

No way I would ever repaint that frameset if it were my bicycle.

Clean her up, get rid of the rust, put on some really good tires and enjoy her.

I've never owned that particular DA gruppo, but I had DA 7400 on mine.

Ran beautifully and still does for the fellow that bought the bicycle from me.

Good luck.
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Old 07-05-12, 11:46 AM
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very nice super record aero! I agree above about not repainting it. I'm currently in the process of repainting that exact frame that was already repainted by the previous owner. It came with a super record headset, and bottom bracket but I'll be replacing it with a complete suntour superbe pro group.
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Old 07-05-12, 11:49 AM
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You should be able to sell those components for enough money to buy better performing ones IMO
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Old 07-05-12, 12:13 PM
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A couple of thoughts.

You have a very early Super Record Aero (probably '82 or '83). Alot of bikes came out about 1980-1982 designed around DA's Aero groupsets. 3Rensho did not go as nuts as some of the other larger manufacturers, but the SRA was availble long after Shimano's Aero components went away. They are cool looking, but can be finicky to get dialed in, and really do not work as well as some of their other stuf. If you are looking at the value of the thing, you ought to consider keeping the DA 7300, and sourcing the parts have have been replaced. You can then hang it on the wall and ride it as you can stand it. It is a rare bird and ought to fetch a decent price.

If you want to ride it, if it were me, I would put all of the DA 7300 bits in a box and forget about them, then put DA 7400 on it, or some other 126mm group set (DA works best). You can always change it back later should you want to get your $$$ out of it.

Finally, you could finance almost any replacement parts you want with the brakes alone. You would loose tyhe aboility to change it back to original, but that may notmatter to you.

I would NOT re-paint it. Simply find some touch-up paint or fingernail polish that is as close as possible, clean the wounds,m and paint them.
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Old 07-05-12, 12:34 PM
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As far as dialing in the rear shifting, these were 'semi-indexed' and used a 7 speed Uniglide cassette, not the same as the later 7400 7 speed, or even the 7400 6 speed index that came ofter it. I can't remember if they made a 7 spd freewheel for that. It is easy to make work.

I ran that setup, more or less for over 20years. You are lucky to have the pedal spindle adapter, nice Dyna Drive pedals are gettting hard to find. I bet the adapters could bring $40-$50 by themselves. The brake pads are still floating around, but no longer $5/pr.
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Old 07-05-12, 12:51 PM
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Originally Posted by ozneddy View Post
What are those brakes ?
Dura-Ace "AX"

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Old 07-05-12, 02:48 PM
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Originally Posted by balindamood View Post
A couple of thoughts.

You have a very early Super Record Aero (probably '82 or '83). Alot of bikes came out about 1980-1982 designed around DA's Aero groupsets. 3Rensho did not go as nuts as some of the other larger manufacturers, but the SRA was availble long after Shimano's Aero components went away. They are cool looking, but can be finicky to get dialed in, and really do not work as well as some of their other stuf. If you are looking at the value of the thing, you ought to consider keeping the DA 7300, and sourcing the parts have have been replaced. You can then hang it on the wall and ride it as you can stand it. It is a rare bird and ought to fetch a decent price.

If you want to ride it, if it were me, I would put all of the DA 7300 bits in a box and forget about them, then put DA 7400 on it, or some other 126mm group set (DA works best). You can always change it back later should you want to get your $$$ out of it.

Finally, you could finance almost any replacement parts you want with the brakes alone. You would loose tyhe aboility to change it back to original, but that may notmatter to you.

I would NOT re-paint it. Simply find some touch-up paint or fingernail polish that is as close as possible, clean the wounds,m and paint them.
I have to disagree on the dating based on a note form Andrew Muzi I have kept on file. I had asked about my first 3Rensho (purple) and below was his reply:

That's an early SRA, the aero model that replaced the SR.
Changes are: plate behind BB, aero fork blades, aero crown, no chrome, drop Shimano EF ends for Campagnolo 1010B ends, aero seat stays, fastback and the shifter mount on top for aero levers ( sizes 525 &up; they won't fit on a 480 or a 505) There were a special models based on that SRA frame too , such as Black And Gold with real gold plating.

As I said I don't have the actual records from serial numbers 500-800 but it's a late 1984 or an '85.

The colors changed in 1985 to secondary, softer pearl colors, lavender instead of purple, aquamarine and rose.


It is indeed an early SRA, but according to Andrew, it is 1985 or later based on the color. It also seems to me the serial format changed somewhere in there as my rose 3Rensho is A525-471, the purple I owned was A560-658. This serial is Cxxx.

Ride that pup.
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Old 07-05-12, 03:02 PM
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The rust is extensive enough to warrant immediate intervention. It's a candidate for an oxalic acid bath for sure!
A 3Rensho frameset is highly prized among collectors. I'd personally would go nuts if I found a 3Rensho in my size.

Looks like the component group isn't complete, I see a Campy FD and Record skewers...Campy hubs?
The stuff is in rough shape though, but it might clean up well enough to net you a good return if sold to collectors. The AX line is rare.
If you wish to make it into a rider, I'd replace the gear with later lines, suggest 600 Tricolor.
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Old 07-05-12, 03:40 PM
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Originally Posted by WNG View Post
The rust is extensive enough to warrant immediate intervention. It's a candidate for an oxalic acid bath for sure!
A 3Rensho frameset is highly prized among collectors. I'd personally would go nuts if I found a 3Rensho in my size.

Looks like the component group isn't complete, I see a Campy FD and Record skewers...Campy hubs?
The stuff is in rough shape though, but it might clean up well enough to net you a good return if sold to collectors. The AX line is rare.
If you wish to make it into a rider, I'd replace the gear with later lines, suggest 600 Tricolor.
It is a Campy FD, Record hubs. Seat post is? Dunno yet. Brake levers are DA AX. The intent is to ride it with a newer group. As mentioned the headset is toast, functionally and cosmetically.
I don't think I would put the AX bits in a box for later, just let them go to finance something pretty. I like the 600 Tricolor a lot. I am really liking STI shifters on my bikes but not sure I would go that route here.

I have not done an OA bath yet but I will take care of the easy small rust spots right away and find the right color for touch up. I won't be able to ride the snot out of it for a few weeks. I just broke 4 ribs on June 23rd> on a mountain bike.
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Old 07-05-12, 10:51 PM
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+1 on strip the frame and clean it up. If it was mine I'd break out the wading pool and my tub of OA for some soak time to clean up the rust spots and then proceed to the spit and polish plus framesaver before deciding on how to build it up again. I'd also clean up the AX parts and store them. As for how to build it up the limiting factor is going to be the top-mount friction shifters.
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Old 07-05-12, 11:26 PM
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I have to disagree on the dating based on a note form Andrew Muzi I have kept on file. I had asked about my first 3Rensho (purple) and below was his reply:

That's an early SRA, the aero model that replaced the SR.
Changes are: plate behind BB, aero fork blades, aero crown, no chrome, drop Shimano EF ends for Campagnolo 1010B ends, aero seat stays, fastback and the shifter mount on top for aero levers ( sizes 525 &up; they won't fit on a 480 or a 505) There were a special models based on that SRA frame too , such as Black And Gold with real gold plating.

As I said I don't have the actual records from serial numbers 500-800 but it's a late 1984 or an '85.

The colors changed in 1985 to secondary, softer pearl colors, lavender instead of purple, aquamarine and rose.

It is indeed an early SRA, but according to Andrew, it is 1985 or later based on the color. It also seems to me the serial format changed somewhere in there as my rose 3Rensho is A525-471, the purple I owned was A560-658. This serial is Cxxx.

Ride that pup.
I based my opinion on some of the same information as yours, but have come to a different conclusion.

1). The paint does not seem to be pearly, so it wouls be prior to 1985

2). It has a very low serial (231), and the prefix is "C", not "A", which is the prefix under which Yellow Jersey imported them. I used to know what some of the other letters mean, but have since forgotten.

3). It has the older seat-tube lug, but the plate behind the BB and the newer fork

4). The Campy ends do not mean anything to me. I have frame A802, early 1987, with Campy drops, whcih about the time that he started to use his own Super-End design.

5). 3Rensho really did alot with the Aero-look stuff...at times even seeming a but obsessed. That said, it is also said that he preferred Campagnolo for components. Why would anyone put DA 7300 on somewthing they actually intended to ride after about 1983? With the 7300 group basically disappearing by 1984, I have to believe this bike is before that.

Given the mix of features, the componbents, and the serial number, I am not swayed and still believe it is about 1982 +/- a year; not that it matters much.

I do agree with your final statement. Go ride it.
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Old 07-06-12, 08:07 AM
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Originally Posted by 23skidoo View Post
As for how to build it up the limiting factor is going to be the top-mount friction shifters.
Indeed. That had not completely sunk in yet. I will have to put on my thinking hat. And google. I would think there must be a thingamajig to make most any drive train option possible but I'm still new compared to a lot of you guys.
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Old 07-06-12, 10:08 AM
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Shimano made a mount for that. I have DA 7400 shifters on mine. With that, you can put almost anything on it (including brifters).
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Old 07-06-12, 10:21 AM
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Originally Posted by balindamood View Post
I based my opinion on some of the same information as yours, but have come to a different conclusion.



2). It has a very low serial (231), and the prefix is "C", not "A", which is the prefix under which Yellow Jersey imported them. I used to know what some of the other letters mean, but have since forgotten.

3). It has the older seat-tube lug, but the plate behind the BB and the newer fork
So you are saying the Cxxx serials predate the Axxx serials. Okay....I learn something every day.
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Old 07-06-12, 10:27 AM
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Originally Posted by tmh657 View Post
Indeed. That had not completely sunk in yet. I will have to put on my thinking hat. And google. I would think there must be a thingamajig to make most any drive train option possible but I'm still new compared to a lot of you guys.
Both of the 3Renshos I own/owned used a Gipiemme aero adapter. Hard to find. I have run DA7400 on mine, but you need to find a flat backing plate for it to work. You can often find those on older Cannondale frames. Currently running Suntour Cyclone/Superbe on mine. I have yet to find a Suntour topmount that can be used without modification. There are other Shimano choices out there using a similar mount to the DA 7300.
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Old 07-06-12, 10:34 AM
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Originally Posted by Italuminium View Post
This is a great score.

One of the few Japanese bikes/components that I covet, but covet I do, badly. Those AX brakes are a crime to set up, get someone to hold the calipers in place (clamps/zip ties don't work too well due to the odd shape), so you have both hands for the nut and wire.

This frame is in far too nice shape to repaint it. remove the rust gently, clean, wax. That's all.
+1, with one addition; I'd sell the AX stuff and buy something like Superbe or 7400. It's an interesting and odd parts group, but I think there's a reason you don't see it much.

I've never ridden a 3rensho, but it's definitely VERY cool! I've always heard their road bikes handle like track bikes - sort of in line with what gomango said.
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Old 07-06-12, 11:13 AM
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Originally Posted by CV-6 View Post
There are other Shimano choices out there using a similar mount to the DA 7300.
The SL-6311 600AX shifters will mount on that boss, as will a Golden Arrow version. I'd love to see one of those adapters in action.
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Old 07-06-12, 12:00 PM
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mine is a fairly early Cyclone Export road frame, has Campy ends and DOs and originally was outfitted in all Campy NR. It was sold to the original owner in SF by an SF shop so I doubt that Yellow Jersey imported it, but have no definite evidence one way or the other...NO serial number on mine (!).
No "aero" features whatever, but does have the San Rensho forkcrown and is the Ishiwata "Super Strong" tubeset.
I'd say the handling is very quick but not twitchy...kind of like a typical Italian frame of the same period.
Never having used a track frame on the road I can't say if that's completely ridiculous but it's sure not what I'd imagine this ride to compare with.
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