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Miyata 312

Old 04-09-18, 11:27 PM
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Miyata 312

saw a 312 at the co-op today in my size, it has the triple butted splined tubing tubeset and i was wondering how good it is. the components are nothing special but the frame looks almost new. just wondered if the framset compares to the higher end miyatas?
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Old 04-10-18, 12:37 AM
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It's good. It compares.
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Old 04-10-18, 01:02 AM
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Miyatas changed their specks alot through the years. A 1986 Miyata 310 is probably better specked than a 1979 Miyata 710. They are great bikes, with bomb-proof paint jobs. Based on the tubing and general Miyata goodness, I don't think you would be disappointed.
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Old 04-10-18, 03:15 AM
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I had a 1988 312. Fast, smooth, and comfy. I sold it to finance something else. It's one of the few bikes that I wish that I still had.

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Old 04-10-18, 06:21 AM
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I don't know much about Miyatas. But, I'm pretty sure that the original 80's Miyata model numbering system is in direct proportion to quality from low to high. So, a 300 series is probably a lower to mid level bike. Probably a very nice dependable ride. I would weigh it. If it's under 28lbs. then it's a good one.
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Old 04-10-18, 07:03 AM
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Miyata's triple butted spline tubeset is very good. Despite a similar tubeset, a 312 frame would have variations from the higher models. Most notably, it would have different geometry, being less aggressive than that used in higher, competition models but less aggressive than higher, grand touring models. Also, since Miyata drew their own tubing, they had the ability to customize tubes for a particular frame design. So, while a 312 may have used splined triple tubes like the upper models, it could differ in parameters such as wall thickness, butt length, etc. Basically, the frame would be tailored to it's intended use and price range, which was sports/fitness and lower mid-range.

Edit: Like most manufacturers. Miyata made a frame perform multiple duty. The 312 typically shared it's frame with the 512. A 312 with splined, triple butted tubing should be a 1988 or 1989 model.

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Old 04-10-18, 11:30 AM
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Originally Posted by ramzilla
I don't know much about Miyatas. But, I'm pretty sure that the original 80's Miyata model numbering system is in direct proportion to quality from low to high. So, a 300 series is probably a lower to mid level bike. Probably a very nice dependable ride. I would weigh it. If it's under 28lbs. then it's a good one.
That is true that a higher number is an indication of higher quality, it wasn't directly linear. 310/312, 512, 710/712, & 912 were all "Semi Pro" or what is generally referred to as Sport Touring bikes. 210/215, 610/615, & 1000 were Touring bikes, for loaded touring. Team and Pro were the top line racing bikes. Geometry was usually the same within a series, with the better bikes getting better tubing and components. So a 312 isn't better than a 215, they are just designed for different uses. As the years went by, the current technology tended to trickle down the line as the higher end bikes got the newest stuff. So a late 1980s 312 will have better tubing and components than an early 1980s 912.
Even though some would call the 312 the low end of Miyata's line, they had a pretty high starting point. I have had my 310 for 33 years and I still put a few hundred miles on it every year.
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Old 04-10-18, 12:08 PM
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Originally Posted by 52telecaster
saw a 312 at the co-op today in my size, it has the triple butted splined tubing tubeset and i was wondering how good it is. the components are nothing special but the frame looks almost new. just wondered if the framset compares to the higher end miyatas?
Tmar explains it best(as usual). Just wanted to add that the lower models typically have a lesser fork material. Lesser simply meaning heavier.
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Old 04-10-18, 12:09 PM
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Originally Posted by 52telecaster
saw a 312 at the co-op today in my size, it has the triple butted splined tubing tubeset and i was wondering how good it is. the components are nothing special but the frame looks almost new. just wondered if the framset compares to the higher end miyatas?
Buy it!

My daughter’s 1985 312 is as nice as my 1979 912, with a prettier paint job. And Miyata paint is incredibly tough and long lasting. My ‘79 with original paint still gets compliments.
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Old 04-10-18, 02:27 PM
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A Miyata 312 passed through my hands a few years ago. It was probably an 86 or 87. It was too small for me, but the price was $35, so I bought it.

I cleaned it up, re-greased the bearings, and sold it for a good profit. My impression was that the frame was very good, and that Miyata had put lower components on it to place it at the right price point.
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Old 04-10-18, 03:12 PM
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bought it for 30 bucks. i'll post a pick eventually
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Old 04-10-18, 04:53 PM
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this is the bike. it had a front wheel with a 27x1 1/8 front tire. i told them to keep it. i put a set of 700c's on it to see what was what. they had some truckish 700x32's on them and there was huge clearance. i could easily do 32's and fenders and probably 35's and fenders if i wanted to get fussy. i think this is going to be a real cool city bike platform. it is pretty nimble but not super twitchy. it also has servicable if low-end components. i however have some cool stuff to soop it up with. thinking an old deore touring crank with some velo orange rings and eventually i would love to have dual pivot brakes and i also have a technomic that will find its way to this bike for sure!
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Old 04-10-18, 05:30 PM
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Leather saddle into the bargain!! woot woot
Quirky thing about the late 80s 312s... Sugino crank is 144BCD. Of interest for those like myself, with a wont for customizing gears.
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Old 04-10-18, 05:57 PM
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I'm a little confused by the clearances on your bike. I too have an '88 312. Here's a pic of the front wheel with 25 x 700c tire. There's a 1/2" of clearance from the crown and absolutley not a snowballs chance in Hell of taking anything much bigger and certainly not a 27" wheelset, nevermind fenders. The back also sports an underinflated 25 x 700c. I don't quite get it.
edit. Your gfx are quite different...I can't find them in the catalogs.



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Old 04-10-18, 05:58 PM
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Around here you'd be lucky to find that bike for $200. Nice!
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Old 04-10-18, 07:43 PM
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Originally Posted by clubman
I'm a little confused by the clearances on your bike. I too have an '88 312. Here's a pic of the front wheel with 25 x 700c tire. There's a 1/2" of clearance from the crown and absolutley not a snowballs chance in Hell of taking anything much bigger and certainly not a 27" wheelset, nevermind fenders. The back also sports an underinflated 25 x 700c. I don't quite get it.
edit. Your gfx are quite different...I can't find them in the catalogs.


i think it is older than i originally stated. i am guessing whatever year they still had 27's.
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Old 04-10-18, 07:54 PM
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That'll do it. Lovely bike and conditional regardless. I'm envious of the clearance as I generally focus on town style bikes anyway and what good are fender stays without clearances.
Congrats.
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Old 04-10-18, 08:19 PM
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https://4.bp.blogspot.com/_whtVpXkKwl...600/img148.jpg

this is from the 87 catalogue and perfectly describes my bike. it explains the greater clearance perfectly. i guess it is an 87!
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Old 04-10-18, 08:19 PM
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Originally Posted by clubman
that'll do it. Lovely bike and conditional regardless. I'm envious of the clearance as i generally focus on town style bikes anyway and what good are fender stays without clearances.
Congrats.
+1
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Old 04-10-18, 08:25 PM
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24.8 lbs, not much behind a 912 at 23.2. Component swaps and upgrades will bring that right down.
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Old 04-10-18, 08:46 PM
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well the brooks isnt going to help that.
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Old 04-10-18, 09:58 PM
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I have her older sister from the Bloomington Bike Coop. A 310. Let's get them together this summer for a ride!

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Old 04-10-18, 11:16 PM
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Originally Posted by schundog
I have her older sister from the Bloomington Bike Coop. A 310. Let's get them together this summer for a ride!

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[IMG][/IMG]

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love that old suntour stuff!
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Old 04-11-18, 06:19 AM
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Originally Posted by 52telecaster
https://4.bp.blogspot.com/_whtVpXkKwl...600/img148.jpg

this is from the 87 catalogue and perfectly describes my bike. it explains the greater clearance perfectly. i guess it is an 87!
Agreed, the livery and components correspond to your bicycle but it's not a perfect match. Note that neither the 1987 catalogue description or specs mention the tubeset as being splined. Attached is a photo of a another 1987 Miyata 312 but with the standard triple butted CrMo tubeset decal (i.e, no mention of splines). Since neither the 1987 catalogue or other known 1987 samples mentioned the splined version of the tubeset, as you did in the original post, your bicycle appeared to be a 1988 or 1989 model pending the posted pictures.

So, the question becomes, did they make a running change to the tubeset during the 1987 model year or was the wrong tubeset decal applied erroneously? Both are distinct possibilities. The only way to know for sure, would be to remove the bottom bracket and check for the splines inside the ends of the tubes. The serial number may also provide a clue.
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Old 04-11-18, 06:59 AM
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Originally Posted by T-Mar
Agreed, the livery and components correspond to your bicycle but it's not a perfect match. Note that neither the 1987 catalogue description or specs mention the tubeset as being splined. Attached is a photo of a another 1987 Miyata 312 but with the standard triple butted CrMo tubeset decal (i.e, no mention of splines). Since neither the 1987 catalogue or other known 1987 samples mentioned the splined version of the tubeset, as you did in the original post, your bicycle appeared to be a 1988 or 1989 model pending the posted pictures.

So, the question becomes, did they make a running change to the tubeset during the 1987 model year or was the wrong tubeset decal applied erroneously? Both are distinct possibilities. The only way to know for sure, would be to remove the bottom bracket and check for the splines inside the ends of the tubes. The serial number may also provide a clue.
actually mine is not splined. i had erroniously assumed all of Miyata's triple butted tubing was splined. what i do know is that 87 ws the only year in quite a stretch that the 3 models had 27" wheels. the 86 310 models had 700c's. my serial # starts P A which means it was built in 87 i think. in any case i bought it in large part because of the beautiful workmanship on the frame and the fact that it had generous clearance at the brake bridge and fork crown. kind of a poor mans rivendell.
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