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Da Vinci crankset weight

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Da Vinci crankset weight

Old 04-16-11, 09:00 AM
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tiggermaxcocoa
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Da Vinci crankset weight

Hello,

I wanted to post about the Da Vinci tandem crankset that I just bought and report on the weight for those that are interested. The light weight of the crankset is one of their major selling points, but on the website they claim it weighs 400 grams, which is obviously incorrect. I just received the tandem crankset with the one piece 34t timing rings and a 53/42/30 triple in the rear. Here are the actual weights from my lab scale:

rear setup: 53/42/30 chainrings with 130bcd and 165mm crankarm on drive side; 34t one piece spider/chainring and 165mm crankarm on timing side - 518 g and 273 g

front setup: 172.5mm crankarm on drive side; 34t one piece spider/chainring and 172.5mm crankarm on timing side - 174 g and 282 g

That gives a grand total of 1247 g without bottom brackets. We figured out that even with our heavy Phil Wood stainless bottom brackets we'll still be about 150 g below the FSA cranksets. Since we have 34t timing rings, we'll also save a little weight by using a slightly smaller chain.

Is it worth it? Only you can decide...
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Old 04-16-11, 10:23 AM
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Originally Posted by tiggermaxcocoa View Post
The light weight of the crankset is one of their major selling points, but on the website they claim it weighs 400 grams, which is obviously incorrect.
Hmmm. It would only be incorrect if you assume that's a crankset with chainrings, etc. 400 grams sounds about right for just the two crank arms and a small spider without chain rings.

They are indeed very light and always have been, well before being light was in vogue. More than being light, they are incredibly durable and will look good for decades if you wipe them down after a ride to remove any sweat or drink residue, noting both will etch the standard polished aluminum finish.

Looking back at our Calfee build sheet, I came up with 1311 grams for 170/170 with 52/42/32 rings. We've got the Phil Wood Mag Ti BBs and, so far so good with those.
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Old 04-16-11, 11:28 PM
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Originally Posted by TandemGeek View Post
well before being light was in vogue.
light has always been in vogue
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Old 04-17-11, 12:07 AM
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Originally Posted by tiggermaxcocoa View Post
- 518 g and 273 g

- 174 g and 282 g
I don't understand the ands.
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Old 04-17-11, 06:12 AM
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Originally Posted by Ritterview View Post
I don't understand the ands.
Right and Left rear cranks
Right and Left front cranks
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Old 04-17-11, 06:20 AM
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Originally Posted by zzzwillzzz View Post
light has always been in vogue
Yeah, I overreached on that one...

Perhaps before stupid light was in voque. No, scratch that... stupid light's been around as long as bikes too.

Let's just leave it at, they always been some of the lightest cranks available for tandems.
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Old 04-17-11, 04:15 PM
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Originally Posted by TandemGeek View Post
Looking back at our Calfee build sheet, I came up with 1311 grams for 170/170 with 52/42/32 rings. We've got the Phil Wood Mag Ti BBs and, so far so good with those.
If you go with the Ti Mag Phil BBs, then the whole set ends up being pretty damn light. Probably closer to a pound lighter? What about adding the belt drive, since Da Vinci will sell you a replacement 130bcd spider for the timing side? There's a $1500 complete crankset right there!

There was a small part of me that wanted to go for the Ti Mag BBs, but I just couldn't justify it. I hope I don't end up regretting it.
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Old 04-17-11, 05:01 PM
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Originally Posted by tiggermaxcocoa View Post
What about adding the belt drive,
No thanks...

Originally Posted by tiggermaxcocoa View Post
There was a small part of me that wanted to go for the Ti Mag BBs, but I just couldn't justify it. I hope I don't end up regretting it.
You'll never notice the difference, except in your check book. Seriously, as sensitive as I am to subtle differences, you're just not going to notice even a couple pounds one way or the other. If you doubt that, add or leave an extra water bottle next time you ride a familiar route. And then put it back on or take it off on the next ride on that same familiar route. If it's a relatively flat route, there will be zero difference and even if there's a 15% climb, you still won't be able to tell the difference as there are just too many other variables that come in to play, e.g., temperature, how you feel, how much you or your stoker's weight has changed since the last ride, etc. that will always mask something as insignificant as a few grams here or there.

The big bang for the buck comes in dropping a pound here and there by switching to things that actually change how a tandem feels, e.g., shedding a pound moving from a steel to a carbon fork and switching out a heavy (2,300 - 2,500 gr) wheelset with heavy tires (900 gr) to a lightweight tandem wheelset (e.g., 36h White/Velocity Fusion @ 1,900 gr) and lighter weight tires (500 gr). After that, it all falls into the noise level, even if you painstaking spend hours and many dollars trimming grams here and there to get another pound out in aggregate.

Last edited by TandemGeek; 04-18-11 at 07:20 AM.
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Old 04-18-11, 08:21 PM
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Originally Posted by TandemGeek View Post
Yeah, I overreached on that one...

...
That's OK: your heart's in the right place, as always.
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Old 04-18-11, 10:03 PM
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Originally Posted by TandemGeek View Post

The big bang for the buck comes in dropping a pound here and there by switching to things that actually change how a tandem feels, e.g., shedding a pound moving from a steel to a carbon fork and switching out a heavy (2,300 - 2,500 gr) wheelset with heavy tires (900 gr) to a lightweight tandem wheelset (e.g., 36h White/Velocity Fusion @ 1,900 gr) and lighter weight tires (500 gr). After that, it all falls into the noise level, even if you painstaking spend hours and many dollars trimming grams here and there to get another pound out in aggregate.
You wrote that exactly as I am thinking about trying some new tires and perhaps a carbon fork on our Primera... I'll start with the tires (the cheaper change) - we were riding touring Schwalbe's 28c Marathon tires up to now: they served well, especially during our last summer's trip to New Brunswick where we rode a lot of unpaved roads, but I would like to try something more "roadie" now. Considering Schwalbe Duremos or Conti GP 4 seasons in 28c - we still need a tire that is reasonably puncture resistant and can absorb some shocks as the Quebec roads are generally in a bad shape (especially after the harsh winter). I am curious how the handling will change.
As for the CF fork, I was thinking of geting the Wound Up Duo, maybe with a disc brake update on the front wheel.
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