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triplelizer and spindle length?

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triplelizer and spindle length?

Old 05-24-22, 04:14 PM
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squirtdad
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triplelizer and spindle length?

I am using a TA tripleizer on a Dura Ace crank set (7400)

I just realized I didn't think about spindle length.

Most Triples have a longer spindle.

Does this apply when using a tripleizer?

have both the original dura ace bb and a un55 cartridge that I used with a 105 triple I had on the bike for last years Cino

thanks
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Old 05-24-22, 04:38 PM
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Yeah, you do need a longer spindle with a triplizer. The 7400 came with an asymmetric 112 mm spindle, which was 3 mm longer on the drive side, for a 43.5 mm chainline. (Details here: https://si.shimano.com/pdfs/si/SI-N-69-000-00-ENG.pdf). The recommended chainline for a road triple is 45mm. With a double at 43.5, the small ring is a 41mm. With a triple, you want the middle ring (which was the small on the double) to be at 45. It doesn't need to be exact, but you at least need it out far enough that the small ring doesn't scrape the frame.

I think a 1.5 mm spacer behind the drive-side cup would give you the right asymmetric proportions, but I usually don't worry about that. I'd suggest a 118mm UN300, and put a spacer behind the drive side cup if you think it's necessary.
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Old 05-24-22, 07:45 PM
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My rule of thumb for a double/triple conversion is add 5mm to the drive side.

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Old 05-24-22, 08:59 PM
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Maybe, maybe not.

My powder-coater installed my 46-year-old Phil Wood bottom bracket (a cartridge type that can be moved side-to-side up to 5 mm according to the manufacturer) right in the middle. I was wondering whether I'd have to move it over, but decided to try it as it was.


We have clearance, Clarence.

My 28T chainring works just fine with the standard-length spindle in the middle.

I would try yours and see.
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Old 05-25-22, 03:23 PM
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Originally Posted by Fredo76 View Post
Maybe, maybe not.
My powder-coater installed my 46-year-old Phil Wood bottom bracket (a cartridge type that can be moved side-to-side up to 5 mm according to the manufacturer) right in the middle. ...
I put a Shimano cartridge in the 1959 Capo after I had it repainted, and I can move the crankset a few mm laterally by whacking the spindle crank of a crank with a rubber mallet. It seems to stay happily aligned as set under normal riding conditions, so I haven't bothered with a thicker or additional internal shims between the cartridge itself and the cups.(The cartridge is tapered very slightly, and fits fairly snugly into the fixed cup.
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Old 05-25-22, 03:57 PM
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What Fredo76 said. Getting it done with minimum work is always good. Does not take much time to install the crank on old spindle, give it a try. If it doesn’t work you will still have a better sense of how long a spindle is really needed.

If the granny ring will be primarily used with only the biggest sprockets on the rear the low effort approach gives better chainline. After you see everything fits and clears the last step is will the derailleur cage move far enough inboard.
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Old 05-25-22, 04:30 PM
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Originally Posted by Fredo76 View Post

We have clearance, Clarence.
Another thing to consider is chain rub. With a 30T or smaller inner ring, the chain is likely to rub on the middle ring when you're fully cross chained. Obviously you will try to avoid being fully cross chained, but it happens.
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