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  1. #1
    Since 1938... JunkYardBike's Avatar
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    Miyata Spline Triple Butted Tubing

    I'm considering the purchase of a late 80s Miyata 312 with what the owner claims is Spline Triple. I read a previous thread on this regarding the strength of STB:

    Quote Originally Posted by T-Mar
    By virtue of the spline construction, Columbus SLX would be the closest of the vintage tubesets. However, Miyata STB used triple butting to further tailor the tubes and had slightly thinner walls.
    Elsewhere, I've read that Columbus SLX is best suited for riders under 150 lbs. I weigh in around 175 lbs on a good day. Would I be advised to look for a bike with heavier gauge tubing? Everything else I could find on this tubing, however, comments on it's durability, given the triple butting.

    Oh, and here's the best pic of the bike the seller provides:



    Opinions?

    Thanks!

  2. #2
    Death fork? Naaaah!! top506's Avatar
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    You'll be fine on that Miyata.
    The 312 wasn't an ultra-light racing bike, but was a very nice sport/fitness bike. The tubeset will support 175-180 LBS without difficulty. It took a wife in a hurry and a pick-up truck to put mine out of comission.
    Top
    (and if you decide to get ride of the Biopace chainrings let me know ).

  3. #3
    Senior Member bigwoo's Avatar
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    I'm 6' feet and 200 lbs and have had no trouble on my Triple-Butted One Twelve.... you should have no problem as long as the seller has taken care of the bike. I've hit potholes and unexpected road obstacles, no problem

  4. #4
    Since 1938... JunkYardBike's Avatar
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    Quote Originally Posted by top506
    (and if you decide to get ride of the Biopace chainrings let me know ).
    Thanks.

    BTW, I replaced the crankset on my Specialized hybrid (early 90s vintage). It sported a biopace ringset 48/38/28. Teeth in great shape, black paint not so pretty. The cranks are stripped though.

    If I do end up with this bike, the crankset will likely be replaced at some point.

  5. #5
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    I have three Splined TB frames here and light they arn't. Miyata is known for stout frames.

  6. #6
    Since 1938... JunkYardBike's Avatar
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    Quote Originally Posted by Fred Smedley
    I have three Splined TB frames here and light they arn't. Miyata is known for stout frames.
    Do you mean they aren't featherweights, or that they are heavy? I guess it's all relative, but I'm looking for a light enough bike for all the hills around here, but something that will support my weight. Other recommendations for tubesets I should be looking for?

  7. #7
    Senior Member peripatetic's Avatar
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    My Miyatas and Univegas are plenty light enough for normal use. And they're very well-made frames.

  8. #8
    Death fork? Naaaah!! top506's Avatar
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    My 512/712 weighs in at about 22.5 lbs all up. That's light enough for me.
    Your 312 will be maybe a pound more.
    FWIW, my 'heavy-duty' Miyata Triplecross is 27lbs ready to ride(bottle racks, pump, and seatbag with patch kit, levers, and a few tools). That's lighter than any non-Paramount Schwinn.
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  9. #9
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    Quote Originally Posted by JunkYardBike
    Do you mean they aren't featherweights, or that they are heavy? I guess it's all relative, but I'm looking for a light enough bike for all the hills around here, but something that will support my weight. Other recommendations for tubesets I should be looking for?
    I mean they are well built, and you should not have to worry about breaking them.

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