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Did I just strike gold? many pics, and questions about new Miyata

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Did I just strike gold? many pics, and questions about new Miyata

Old 05-26-09, 06:16 AM
  #1  
rugerben
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Did I just strike gold? many pics, and questions about new Miyata

My neighbor just gave me his old bike. Walked me to his garage and told me how his bike was 'top of the line' 20 years ago. I think "everybody thinks that any bike with drop bars was a top of the line race bike, but hey, he wants to give it to me so who am I to argue."
he pulls a tarp off an old bike and this is revealed.



It had clamp on aero bars, kick stand, and some really stupid looking saddle with two foam blocks that moved independently that you sat on. I removed the nonsense before taking pics. Still need to clean it up.

It's a 721A.

"Alumitech" frame which seems to be aluminum tubes that are lugged. How could they get aluminum to bond to what I must assume are steel lugs?



It's a 3x7 setup. FD, RD, and crankset are all Shimano 500LX.
Hubs are Exage. Rims are Araya 700c.





What's with the seatstays? I've never seen seatstays connected to the seatpost like this.



From the paint scheme, gearing etc... i assumed the bike to be '89ish. I did a search for 'miyata 721a' here on C&V and came up with very little except to say that it was a sporty 'grand touring' bike, and that it was probably from 1990. I looked up the old Miyata catalogues and could not find this model and paint scheme anywhere from 88-91.

If there is ANY info you can give me any info, i'd appreciate it.

How should i expect this bike to ride? will it be that much harsher than my steel bikes?
Is the bike worth much should I decide not to keep it?

Edit to add:
There's this little wire thing that is connected to the seatstay bridge that comes down and runs along the tire. the guy said it was there to keep the tire clean. anybody ever hear of such a thing?

Last edited by rugerben; 05-26-09 at 06:40 PM.
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Old 05-26-09, 06:18 AM
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i cant give you any info, but that paint color is pretty awesome
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Old 05-26-09, 06:24 AM
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Yeah, that is a pretty nice gift. I'm thinking "top of the line" is stretching it a bit though. Still, it is a higher end Miyata and they didn't make junk, and it looks like it's in really really nice shape.

I have an aluminum framed bike and don't think it's bad at all. I just rode 30 miles on it yesterday and was comfortable. That bike is a keeper (or a really nice flip)
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Old 05-26-09, 06:36 AM
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The rear triangle is steel, bolted on. The aluminum tubes are glued into the lugs. I had the wire "nail pullers" on my first ten speed, They help prevent flats by removing sharp stuff that gets picked up before it gets pushed deeper into the tire.
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Old 05-26-09, 06:49 AM
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It appears to be a 1990.

You might find these helpful.

http://3.bp.blogspot.com/_whtVpXkKwl...0-h/img231.jpg
http://2.bp.blogspot.com/_whtVpXkKwl...0-h/img249.jpg
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Old 05-26-09, 06:52 AM
  #6  
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Something I found:
Originally Posted by T-Mar View Post
The single braze-on accepts a holder for compressed air cartridges. This feature was common on many of the mid and high range Miyata in the late 1980s and early 1990s. This was a nod to the triathlon crowd with which these models were popular. Unlike road racing, triathlon did not allow outside assistance for punctures, so carrying your own spare and means of filling it was necessary. The compressed air cartridges filled tires much more quickly than a pump, so they were a competitive advantage.

The 718A was built for for year only, 1999. But don't get the idea it was a failed concept. It got an extra cog and evolved into the 721A for 1990.

The concept of the 718A was to add a triple chainring to a lightweight, reponsive frame, thus permitting the avaerage cyclist to tackle big, long hills, without sacrificing high end performance. These bicycles are particularly well suited to rides like hilly centuries or for average strength cyclists who live in hilly country. At a claimed weight of 21.5 lbs, there is no arguing that the 718A is not a light bicycle.

The main triangle is aluminum which is bonded to a steel rear triangle. The presence of rack braze-ons on the seat stays indicates it was intended to carry a load, but I can't say how much load. I suspect it is somewhat less than a grand touring model and more along the lines of what you would carry during a century. Maybe a some rain gear, a change of clothes, your food and some basic tools. It would also make a great performance oriented commuter.

I doubt heavy loads would cause frame failure, but they may adversely affect the handling. Remember, this was still a light-weight performance oriented bicycle, so the steel in the stays is proably lighter gauge than what you would find in a grand touring model.

I trust this helps. Given that this bicycle has a known model year, it would be appreciated if you would post or PM me with the serial number for my database. TIA.
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Old 05-26-09, 07:18 AM
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Great score, but it would help if you would stack your wide images rather than placing them side by side.
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Old 05-26-09, 07:28 AM
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Any of the Alumicross bikes were very good machines. I had the "top" AX model and found the steel rear/fork to give it a very smoothed out ride compared to my Cannondale's....

Nice freebie!
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Old 05-26-09, 06:45 PM
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Pictures stacked. Thanks for brining it to my attention.

I really like this bike. I have to get a seatpost and throw a saddle on it and see how she feels. If I decide to keep her, I might throw on something like a Brooks Swift or comparable.

Any other info?

Thanks so much everything so far.
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Old 05-26-09, 07:21 PM
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Nice bike,

I've got the Miyata 1100a from 89. Same type of frame with Cro-mo rear triangle and fork.
Pretty much the same paint scheme, 80's day-glo wonderfullness!

The bike handles very well. I've got it set up as my fixed gear/single speed rider (kept all the
Sun Tour GPX parts for the unconversion) Enjoy it.
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Old 05-26-09, 07:24 PM
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I love that bar tape. I'd save the Swift for something with a classic look. This one screams for a saddle with some wild graphics.
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Old 05-26-09, 07:56 PM
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The Exage 500 LX/EX/CX is a favorite group of mine. Built up three bikes with the stuff and two more after the LX morphed into Deore LX,
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(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)
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Old 05-26-09, 08:16 PM
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You should remove the Rock Ring. It was designed for mountain biking in rocky terrain so uneven that your big chainring is hitting stone and getting damaged/broken teeth. The edge of it is stepped like that instead of smooth so you can still use it as you would use the big ring to grind over logs fallen across the trail. I don't think you'll need that on this bike.

The original SPD pedal, Deore XT? Looks like from here. If so, that's pretty cool. Again a MTB product, but I'd think about using them on this bike if I was you.

Good info in the T-mar quote except I think he is wrong about the steel stays being bonded to the aluminum main triangle. The aluminum tubes are bonded together and the steel stays are bolted on.

Last edited by qmsdc15; 05-26-09 at 08:34 PM.
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Old 05-26-09, 08:45 PM
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Awesome info guys. I really appreciate it.

I was wondering what the heck was the deal with the "rock ring." Why on G-d's green earth would anyone put that on a sporty road/touring/grand touring bike?
I mean, this neighbor is a bit of an odd duck, so it's not exactly surprising.
I'll remove that.

the pedals are indeed SPD. I am not sure if I want to swap them out or not. On the one hand, I have SPD's on most of my bikes, and love them to bits. On the other hand, if these are old, I don't know that I want to subject them to the abuse of regular usage when a $35 pair of brand new SPD's can get beaten up while the originals sit in retirement. Not sure if these are XT or not. I didn't notice it say anything one way or another on the pedals, but I'll check when I get back home tomorrow.
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Old 05-26-09, 08:55 PM
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Possibly the Rockring could keep your trousers from getting greasy or shoelaces out of the drivetrain, but I wouldn't rely on it for either purpose. Maybe that was what he was thinking though.
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Old 05-26-09, 09:21 PM
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Originally Posted by JunkYardBike View Post
I love that bar tape. I'd save the Swift for something with a classic look. This one screams for a saddle with some wild graphics.
Agreed. The Brooks would look somewhat akin to wearing a tweed cap with your neon leg warmers and a single white glove, covered in rhinestones.
A word about the little wire doo-dad attached to the downtube: if wedged against the front wheel it will prevent the fork and handlebars from turning. The bike can then be propped against any solid object without falling over. It replaces a kickstand, and why the bike would have both I will not hazard a guess- an odd duck indeed.
Satisfy my curiosity- are the seatstays connected to the frame in any other way than with the seatpost binder bolt? That's rather more load than I'd like to put on a bolt like that...
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Old 05-26-09, 10:04 PM
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Buy your neighbour a nice bottle of red wine.
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Old 05-27-09, 05:49 AM
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Originally Posted by jet sanchEz View Post
Buy your neighbour a nice bottle of red wine.
He's a recovering alcoholic and a diabetic. Wine is out. But I do understand where you're going with this and think it's a great idea. I'l come up with a good gift for him.
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Old 05-27-09, 10:27 AM
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Buy him a new bike, a cruiser would be good. Exercise is good for diabetes.

You asked how do you bond aluminum to steel, It's easy, really. The (epoxy?) adhesive is selected such that it is strongly adherent to both. The adhesive bonds to the steel. The adhesive bonds to the aluminum. Voila! Aluminum is bonded to steel. Yes, this means the adhesive has to carry the mechanical loads across the interface. Epoxy is a good, tough adhesive. It adheres well to a lot of materials, it is compliant enough not to fracture (too much) yet it has a reasonably high modulus of elasticity (stiffness).
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Old 05-27-09, 10:49 AM
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great freebie!
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Old 05-27-09, 11:11 AM
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Strike gold? nah. It's aluminum.

Nice bike though - especially for free.
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Old 05-27-09, 11:17 AM
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I'd love one of those little doodads... they are a brilliant idea and if you don;t want or need it, send me a note.

Or if anyone else has a spare...send me a note.

Love that bike.
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Old 05-27-09, 12:05 PM
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That looks like an amazing new addition to the family. Consider me jealous.
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Old 05-27-09, 04:32 PM
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On the downtube is the once common "Flickstand". Sold by Rhode Gear.When most bikes were close to the same downtube outside diameter. It looks like it needs almost nothing.
Was the seat 2 plastic pads? There was a canvas sling type seat around years ago.Seems a seat, or saddle without a nose on it dosen't improve the experience, just degrades the ride,and looks too nerdy.Chris
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Old 05-28-09, 02:44 AM
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Originally Posted by Chuckk View Post
Miyata put A LOT OF MONEY into making some really beautiful castings for their aluminum lugged bikes.
But everything seemed to disappear in just a few years. What a shame!


Here's a link to a bunch of detail shots of my '91 Elevation 5000
True and that particular BB lug on your pic was carried for only one year. It was one among many little modifications for the 91MY. Few other: OS headtube and redesigned dropouts. And than already by 1992 there was an entirely new bonded frame design!

1990 BB lug >>

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