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Maruishi RX7

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Maruishi RX7

Old 05-06-13, 09:37 PM
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MorganoBike
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Maruishi RX7

Just wanted to show off my Maruishi and ask a few questions about it.



I got it about a year and a half ago and have been gradually improving it, and now that it has a new saddle, and looks half way decent from a distance, I'm ready to share it (purely in a visual context).







When I first got it I researched and found the serial numbers on the suntour components were from 1984, and the dia-compe brakes from a year or two earlier. does anyone know if that is a consistent year for the distinctive head and seat tube decals it has?



I'm also curious about the frame tubes. it seems like most RX7s came with butted or double butted cromoly tubes, however the seat tube decal on my bike only says Cro.Mo. nothing about butted. the bike weighs 25 lb with the somewhat beefy forte strada tires on it. Whatever the tubes, I think it's an awesome bike and really fun to ride. it's the perfect bike for me.
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Old 05-07-13, 06:05 AM
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What you have appears to be a 1984 model. I have a 1984 spec list and a 1985 catalog. The 1984 was spec'd with SunTour ARx and "chrome-moly plain gauge main tubes, hi-tension chain stays, seat stays and fork", while the 1985 used Shimano 105 and "Tange chrome-moly double butted", again with hi-tensile stays and forks. Given that the 1985 used Tange, the 1984 probably used a Tange #5 main triangle. While there is no way to tell for sure, a 26.8mm post would support a Tange #5 tubeset.

The head tube decal is definitely different than 1985. They used the same generic tubing decals in 1985 as in 1984, though your specific decal appears on the lower RX4 with the 1985 RX7's stating "butted frame tubes" in ther lower right corner.
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Old 05-07-13, 09:31 AM
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Thanks T-mar, it's nice to nail down the date. The seatpost itself measured 28.3 mm, but I didn't measure the ID of the seat tube which may be slightly larger.
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Old 05-07-13, 09:44 AM
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Originally Posted by MorganoBike View Post
Thanks T-mar, it's nice to nail down the date. The seatpost itself measured 28.3 mm, but I didn't measure the ID of the seat tube which may be slightly larger.
That diameter sounds far too large given the era. Also, seat posts were typically not produced in odd increments. Maybe it's 26.2mm or 26.4mm? Try pulling the post and check for a size stamp, somewhere below the insertion mark. I'd also appreciate the frame's serial number. TIA.
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Old 05-07-13, 02:05 PM
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bike looks nice, I bet it rides well.
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Old 05-07-13, 02:35 PM
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that looks like a perfect fun cruise bike, comfy and fast.
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Old 05-07-13, 07:52 PM
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Sorry, the 28.3 was a typo, I meant 26.3, but I wasn't super careful with the calipers so there's probably at least +- .1 mm error. I'm working late, but I'll take a look and get a better measure and look for a size stamp when I get home. I'll also get the serial number.
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Old 05-07-13, 10:36 PM
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took the seat post out and it's labeled 26.4
SN is DK25711
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Old 05-08-13, 06:46 AM
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In which case, I can't identify the tubeset. That's too small for Tange and, to the best of my knowkedge, Ishiwata did not offer a plain gauge CrMo tubeset. As for the serial number, it may be the Tsunoda format. They were known for making the Lotus brand bicycles.
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Old 05-08-13, 07:14 AM
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Nice bike, Morgan.
I don't think even Maruishi was too sure about what tubing they were using (The catalog says my TA18 tourer is Ishi-022, and it isn't) - but anyway, I think these Maruishi's were among the best bikes coming out of Japan during that period - especially the ones with the kangaroo-fork-crowns.
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Old 05-08-13, 08:52 AM
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Originally Posted by auchencrow View Post
Nice bike, Morgan.
I don't think even Maruishi was too sure about what tubing they were using (The catalog says my TA18 tourer is Ishi-022, and it isn't) - but anyway, I think these Maruishi's were among the best bikes coming out of Japan during that period - especially the ones with the kangaroo-fork-crowns.
Thanks Auchen and T-mar, I have to admit, the kangaroos were a selling point for me, and I don't regret it.
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Old 05-08-13, 10:57 AM
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Originally Posted by auchencrow View Post
I don't think even Maruishi was too sure about what tubing they were using (The catalog says my TA18 tourer is Ishi-022, and it isn't) - but anyway, I think these Maruishi's were among the best bikes coming out of Japan during that period - especially the ones with the kangaroo-fork-crowns.
Are you sure the catalog spec'd 022? The Maruishi catalogs that I've seen are pretty vague beyond stating Tange or Ishiwata.

For those who aren't aware, there's an interesting story behind the adoption of the kangaroo emblem. It was noted that an English gentleman wearing a swallow-tailed coat and riding a hi-wheeled bicycle resembled a kanagaroo. Maruishi was reported to be Japan's oldest bicycle company, having imported bicycles as early as 1884. However, this is different from being Japan's oldest bicycle manufacturer, a distnction which belongs to Miyata.
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Old 05-09-13, 07:01 AM
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Originally Posted by T-Mar View Post
Are you sure the catalog spec'd 022? The Maruishi catalogs that I've seen are pretty vague beyond stating Tange or Ishiwata.
..
T-Mar -
Yes indeed the catalog says "Ishiwate 022" for my T18 tourer - HERE is the link to the catalog page.
I think .022 would make for a pretty whippy tourer .
I don't know what tubing it actually is, but the label such says :
"Special Sports Frame
CR MO
Double Butted Tubes"


Interesting anecdote on the origin of the kangaroo logo BTW.
.
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Old 05-09-13, 12:23 PM
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Originally Posted by auchencrow View Post
T-Mar -
Yes indeed the catalog says "Ishiwate 022" for my T18 tourer - HERE is the link to the catalog page.
I think .022 would make for a pretty whippy tourer .
I don't know what tubing it actually is, but the label such says :
"Special Sports Frame
CR MO
Double Butted Tubes"


Interesting anecdote on the origin of the kangaroo logo BTW.
.
D'oh! I didn't realize they had the tubing grade specified in the header description! Thxs!

You do realize that is a 1985 catalog, despite the 1984 print date? That anecdote is on the back cover.

The one thing you have to consider is the 022 was spec'd only in the main triangle, It's got hi-tensile blades and stays to stiffen up the forks and rear triangle and handle the extra load. Still, a full 022 grand touring frameset would not have been out of the question. It was the equivalent of Tange #2 and there were some highly respected GT models with full Tange #2, such as the Centurion Pro Tour. There were even some GT bicycles with full Columbus SL, such as the Lotus Odyssey. I assume you're basing your non-022 statement on the fact that uses a smaller than 27.2mm seat post?
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Old 05-09-13, 02:15 PM
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Originally Posted by T-Mar View Post
D'oh! I didn't realize they had the tubing grade specified in the header description! Thxs!

You do realize that is a 1985 catalog, despite the 1984 print date? That anecdote is on the back cover.

The one thing you have to consider is the 022 was spec'd only in the main triangle, It's got hi-tensile blades and stays to stiffen up the forks and rear triangle and handle the extra load. Still, a full 022 grand touring frameset would not have been out of the question. It was the equivalent of Tange #2 and there were some highly respected GT models with full Tange #2, such as the Centurion Pro Tour. There were even some GT bicycles with full Columbus SL, such as the Lotus Odyssey. I assume you're basing your non-022 statement on the fact that uses a smaller than 27.2mm seat post?
Thanks T-Mar - My TA18 seat post is a 26.6mm. So you think it actually is a 3-tube Ishi022 after all? Interesting. I would have thought they'd print something more definitive on the tubing label than "Special sports frame CRMO..."
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Old 05-09-13, 10:18 PM
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Originally Posted by auchencrow View Post
Thanks T-Mar - My TA18 seat post is a 26.6mm. So you think it actually is a 3-tube Ishi022 after all? Interesting. I would have thought they'd print something more definitive on the tubing label than "Special sports frame CRMO..."
Interesting, I'm wondering if it's not a 1985? The 1984 specs mention an Ishiwata 025 tubeset which was a combination of butted and plain gauge tubes, with the seat tube being plain gauge and 1.0mm thick. That would work out to a 26.6mm post. The component specs are mostly the same but there are some differences. 1985 used a 6 speed freewheel, Vetta saddle and Dia-Compe 981 cantilevers, while the 1984 used a 5 speed freewheel, Kashimax saddle and Dia-Compe 960 cantilevers.

The real interesting thing about the 1984 is that it mentions "four water bottle mounts". Unfortunately, I only have the specs, no pictures, so it could mean either two or four bottles. I have seen set-ups with double bottles on the top of the down tube, so four bottles are possible.
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Old 05-10-13, 05:14 AM
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Originally Posted by T-Mar View Post
Interesting, I'm wondering if it's not a 1985? The 1984 specs mention an Ishiwata 025 tubeset which was a combination of butted and plain gauge tubes, with the seat tube being plain gauge and 1.0mm thick. That would work out to a 26.6mm post. The component specs are mostly the same but there are some differences. 1985 used a 6 speed freewheel, Vetta saddle and Dia-Compe 981 cantilevers, while the 1984 used a 5 speed freewheel, Kashimax saddle and Dia-Compe 960 cantilevers.

The real interesting thing about the 1984 is that it mentions "four water bottle mounts". Unfortunately, I only have the specs, no pictures, so it could mean either two or four bottles. I have seen set-ups with double bottles on the top of the down tube, so four bottles are possible.
Well THANK YOU T-Mar! You nailed it again - Mine came with a 6-spd FW, Vetta saddle, and DiaCompe 981 canti's, so for sure I have a 1985 model!
Ishiwata 025 would make sense too.
It also only has two H2O bottle mounts.
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Old 05-10-13, 06:42 AM
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Originally Posted by auchencrow View Post
...Mine came with a 6-spd FW, Vetta saddle, and DiaCompe 981 canti's, so for sure I have a 1985 model!
Ishiwata 025 would make sense too....
Hmm, so I wonder if the 022 in the catalog is a misprint or if they they had some 2nd thoughts and reverted to 025? I guess we'll never know.

Maybe they used the generic tubing decal, so they could have a little more freedom in making running changes during model years?
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