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3Rensho Road frame build up

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3Rensho Road frame build up

Old 07-05-20, 08:52 AM
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vladuz976
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3Rensho Road frame build up

Hi,
I have this 58cm 3Rensho road frame that I want to start using. I have no experience with road bikes. I come from a fixed gear setup and need some help here.
What year might this frame be?
I would like to build this bike using vintage or vintage looking new parts. I have no idea what I need. I am looking for nothing fancy, just a good working setup. 7 or 8 speed is all I need I think. I don't mind spending a little bit of money on good parts that last.
Thank you in advance!

-Eric








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Old 07-05-20, 08:57 AM
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vladuz976 , very nice frame!

If it were mine, I'd start looking for 1980's era Shimano Dura Ace components.

https://cycling-passion.com/dura-ace-history/
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Old 07-05-20, 09:25 AM
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8 speed.
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Old 07-05-20, 09:36 AM
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This is my build.
3Rensho Super Record Export Aero (SRA)

Contact Andrew Muzi at Yellow Jersey with your serial number and he will tell you from when it is. This helps you to decide on parts.

Looking forward to see your build.
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Old 07-05-20, 09:54 AM
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If ever a frame was calling for a Suntour Superbe Pro build....


The cheapest period-appropriate way to get it going would honestly be to find an appropriate used bike with a good condition Suntour Cyclone/Shimano 600 group and part it over. Those are good parts and also can frequently be found cheaper on complete bikes than sourcing individual vintage parts yourself.
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Old 07-05-20, 10:12 AM
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Dura Ace would certainly look good on this. Superbe Pro another good choice. I did both. Pics below. A more economical choice might be Shimano 600 Tri-Color or Suntour Cyclone.

P2212388 by L Travers, on Flickr

3Rensho DA 02 by L Travers, on Flickr

If you have the budget, then C-Record is a nice choice.

P5130846 by L Travers, on Flickr
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Old 07-05-20, 10:14 AM
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That’s a great blank canvas to start with. I first determine if I want downtube shifters or STI (integrated with brake levers). For me this is a matter of whether I’ll use the bike more for solo riding or if I plan to use on lively club rides (STI).

You have two great suggestions in the posts above. Dura Ace 7400 8spd STI would be an awesome setup. 7spd downtube would be good dressed in Dura Ace or Suntour Superbe.

Enjoy the hunt and report out on the finished product.
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Old 07-05-20, 10:43 AM
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i'll take a guess your frame is roughly mid 1980s. i have a similar era 3resnho frame in blue. came with full campy super record. switched it to suntour superbe group and just recently switched again to dura ace 7400

the dura ace 7400 happens to be my favorite functionally so far

i agree with sheddle's advice : prob your easiest way forward - keep an eye out for a reasonable high end japanese road 1980s bike and migrate the parts over

i've done the same any number of times and it ends up cheaper and better integrated in the long run vs buying individual parts

not sure what the used bike market is like in shinjuku but look for upper end models of bridgestone / miyata / univega / centurion / nishiki / panasonic / fuji etc

good luck ! those 3renshos are really fantastic both in craftsmanship and esp ride quality

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Old 07-05-20, 11:09 AM
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Can you share a close-up of the seatcluster, seat stay caps? Plus the serial number?
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Old 07-05-20, 11:26 AM
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Originally Posted by vladuz976 View Post
...
I would like to build this bike using vintage or vintage looking new parts. I have no idea what I need. I am looking for nothing fancy, just a good working setup. 7 or 8 speed is all I need I think...
I'm assuming you are actually me, and are saying "I wanna do it on the cheap."

My first impulse would be to find a Craigslist or garage sale bike with all the right parts being given away for next to nothing. (A little more rare nowadays than a few years ago; still sometimes you get lucky).

Second impulse would be find the best set of wheels I can, and build up from there, depending on what cog cluster the rear can accommodate.

I'm another fan of the Shimano 600 TriColor group; you'll find many of us here. It's plentiful on the secondary market, is the most handsome group you can get with brifters (or downtube shifters) and is usually reasonably cheap. IME, it seems to work as well as anything out there.
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Old 07-05-20, 05:21 PM
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Originally Posted by unworthy1 View Post
Can you share a close-up of the seatcluster, seat stay caps? Plus the serial number?
I can't right now. The frame is still with my sister in Seattle. I'm having it shipped to Tokyo as the recent shipping restrictions have just been eased. I'll post more details when they become available.
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Old 07-05-20, 06:46 PM
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Dura Ace 7700.
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Old 07-06-20, 09:48 AM
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the reason I ask about seeing a clear shot of the seatcluster is from what I can make out it the OP's photos the stay caps look to be unusual for a San Rensho: they look to be smooth and "semi-wrap" high and froward on the seat lug, whereas MOST of the early Cyclone Export road frames I'm aware of used the caps with the cast-in name ala several Italian makes (see this pic of my own), until later models came along with "fastback" style attachments like CV-6 examples. Although at a glance the forkcrown looks like it could be genuine with the "forward of centerline" blades, but that's hard to confirm in these pix, too.
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Old 07-06-20, 09:55 AM
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Restomod with silver campagnolo all the way. Probably have to go with 10 speed centaur or athena if you want silver, but that's how I'd build it out. But then that's how I'd build out any nice frame from the mid-80's or newer.
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Old 07-06-20, 10:04 AM
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Someone was selling a 3rensho frame in Seattle? And they didn't contact me? What's their deal?
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Old 07-06-20, 10:16 AM
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Originally Posted by unworthy1 View Post
the reason I ask about seeing a clear shot of the seatcluster is from what I can make out it the OP's photos the stay caps look to be unusual for a San Rensho: they look to be smooth and "semi-wrap" high and froward on the seat lug, whereas MOST of the early Cyclone Export road frames I'm aware of used the caps with the cast-in name ala several Italian makes (see this pic of my own), until later models came along with "fastback" style attachments like CV-6 examples. Although at a glance the forkcrown looks like it could be genuine with the "forward of centerline" blades, but that's hard to confirm in these pix, too.
I believe this frame might be a 3rensho Athlete with a decal set for a SR Export. Some of the Athlete model frames has plain semi wrap seatstay caps.
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Old 07-06-20, 02:39 PM
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Originally Posted by styggno1 View Post
I believe this frame might be a 3rensho Athlete with a decal set for a SR Export. Some of the Athlete model frames has plain semi wrap seatstay caps.
I do believe that's the case, here.The example shown has the same seat stay caps as this Athlete (with unfortunate stay crimping) and another C&Ver had a pic of the correct graphics for an Athlete frame (but apparently nobody makes re-pops of these decals) The all-red paint seems consistent, too.

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Old 07-06-20, 02:51 PM
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Based on the over the BB cable routing, I'd presume this bike is from the early 80s. Certainly not later. It predates Shimano 7400.

Most likely it would have been 6 speed originally. Verify this by measuring the rear triangle. Should be ~126mm between dropouts. You'll be able to use 7sp if you want. To use anything else (ie 8-11sp) you'll most likely need to respace the frame to 130.

I vote for 'frankenstein' mix of Japanese parts, since it was typical of this period. Sugino MIghty Crankset, preferably a drillium model. Gran Compe Aero brakes. Superbe derailleurs. Maybe some early style shallow aero rims.

I'm not personally a big fan of Dura Ace prior to 7400. Some of the aero stuff was interesting.
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Old 07-06-20, 03:07 PM
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On a rare special frame like this I would not try to cold set it to 130mm. Leave it at 126mm. If you want to run 8 speed just use the 9 speed cassette and leave out one cog.
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Old 07-06-20, 03:15 PM
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Originally Posted by sheddle View Post
Someone was selling a 3rensho frame in Seattle? And they didn't contact me? What's their deal?
Iíve actually been sitting on this for a few years now. I finished my fixed gear build and I want to start building this one now. If I remember correctly it came from the Chicago area. I just had it shipped to Seattle for storage. Long term projects...
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Old 07-06-20, 03:20 PM
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Guys, thanks so much for all the info so far. Iím having this shipped to me in Tokyo soon and will post better close ups. One more newbie question. What is Dura Ace SIS? Is that different from SIT?
Also, should I have this repainted? Iím speaking with GiraGira here in Tokyo. Nagasawaís paint shop can repaint it. The decals are an issue as they wonít be original.
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Old 07-06-20, 03:22 PM
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SIS = indexed. STI = dual control levers, aka integrated brake/shift controls
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Old 07-06-20, 11:38 PM
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Old 07-07-20, 12:38 AM
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Hello up there in Shinjuku! (I'm a few kilometres south of you.)

You haven't mentioned, and nobody has asked, about your purpose. You want "a good working setup" -- for what? As you'll probably know, there are some pretty ferocious climbs not far beyond Takao, Musashi Itsukaichi, or Ōme station. (Indeed, it's hard to plan rides that neither have steepish climbs nor are just flat and boring.) I know some people with strong thighs but none of them would go there on a bike that had 52/42 chainwheels, 14-25 sprockets. Imaginably, you're even stronger (or more masochistic, or keener to do yourself an injury), but I doubt it. So I suggest that you at least consider lower gearing. Anyway, once you've decided what gearing you want, then consider the brand, etc.

If you're planning to do your component shopping in Japan, forget about vintage Campagnolo goodies. The pricing is ridiculous. You're unlikely to encounter Gipiemme or Zeus. Sanko would be anachronistic and anyway it's rare and expensive. Stick to Suntour or Shimano. Luckily quite a number of models came with long cage (or "GT") versions: see Disraeli Gears.
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Old 07-07-20, 12:47 AM
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Originally Posted by microcord View Post
Hello up there in Shinjuku! (I'm a few kilometres south of you.)

You haven't mentioned, and nobody has asked, about your purpose. You want "a good working setup" -- for what? As you'll probably know, there are some pretty ferocious climbs not far beyond Takao, Musashi Itsukaichi, or Ōme station. (Indeed, it's hard to plan rides that neither have steepish climbs nor are just flat and boring.) I know some people with strong thighs but none of them would go there on a bike that had 52/42 chainwheels, 14-25 sprockets. Imaginably, you're even stronger (or more masochistic, or keener to do yourself an injury), but I doubt it. So I suggest that you at least consider lower gearing. Anyway, once you've decided what gearing you want, then consider the brand, etc.

If you're planning to do your component shopping in Japan, forget about vintage Campagnolo goodies. The pricing is ridiculous. You're unlikely to encounter Gipiemme or Zeus. Sanko would be anachronistic and anyway it's rare and expensive. Stick to Suntour or Shimano. Luckily quite a number of models came with long cage (or "GT") versions: see Disraeli Gears.
IĎm completely new to road bikes. Iíve taken my Nagasawa to Kawaguchiko and Okutama and rode it around the flat areas around the lakes. Itís beautiful for that and the city obviously but Iíd like to join some friends on longer rides. Tokyo to Kawaguchiko for example. With my fixed gear thatís simply not an option.
the plan is to keep the Nagasawa for the city and build the 3rensho for weekend trips.
Iím 6í1Ē 200lb. I have 167.5cm Sugino cranks on my Nagasawa but thatís also a fairly high sitting frame for indoor tracks. Iím a little lost to be honest at the moment. I kind of want to get the bike ready just to ride it. At the same time I donít wanna put crappy components on it that Iíll end up replacing anyhow.

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