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Lightweight vintage triple cranksets

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Lightweight vintage triple cranksets

Old 07-27-21, 05:59 AM
  #26  
DorkDisk
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RaceFace Turbine LPs came in at about 460g for the arms IIRC. I used to have Toplines but they cracked on me twice. After swapping to these, my feet hurt at first from the improved stiffness. I still have them and many sets are still alive. Pictured is my red microdrive model, my black 110/74 is still in action.

Last edited by DorkDisk; 07-27-21 at 06:09 AM. Reason: Uses 113 spindle, is very Low Profile
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Old 07-27-21, 06:14 AM
  #27  
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I've got an Avocet triple crankset that from the thinness of the crank arms is probably pretty light. I'm missing the unobtainium inner bolts and spacers, and theoretically, it needs an IOS triple leangth bottom bracket. I've seen them go on Ebay for under a $100. I'm not an expert on old Campagnolo stuff, but I believe that some of the older double cranks where converted into triples by drilling bolt holes for the inner ring into the crank spider.
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Old 07-27-21, 06:20 AM
  #28  
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FWIW, Stronglight made drillium 86mm BCD rings for the mod. 99 and 100 cranks; here mounted on a Sakae Ringyo Apex:
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Old 07-27-21, 06:44 AM
  #29  
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Here is something else to consider/look for. Some of these cranks came with smaller diameter holes/bolts for the third ring. The smaller bolts can be hard to find. Both the Sakae CR and Takagi Tourney AD pictured here have the small holes. (I don't know why the pic loaded upside down)



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Old 07-27-21, 01:16 PM
  #30  
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Originally Posted by philpeugeot View Post
Specialized "flag" triple?
Nicely made and reputed to be light, but also said to have a tendency to crack where the spider meets the arm.
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Old 07-27-21, 01:19 PM
  #31  
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It seems that nobody has mentioned the 110/74 Ritchey Logic cranks. Reputed to be very light and well-engineered (no tendency to crack). I have two pair of 180's that I'd love to trade for 175's.

Scott Peterson
Newport, OR
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Old 07-27-21, 01:49 PM
  #32  
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Another possible option is the Red Clover Components triplizer ring (forum member @jonwvara):
https://www.redclovercomponents.com/
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Old 07-27-21, 03:30 PM
  #33  
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Originally Posted by steelbikeguy View Post
Any interest in a Sugino AT? It is a fine 110/74 crank that can be set up as a double or triple. I happen to have a set of bare crank arms sitting out at this time, and could toss them on the scale.

Steve in Peoria
I love the AT, it would be amazing if you could weigh them!!!

Thank you all SO MUCH for all this info!! Love it. You given me tons of great options to ponder. I really appreciate it!
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Old 07-27-21, 03:36 PM
  #34  
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Originally Posted by Dfrost View Post
FWIW, since I’m certainly not a weight weenie, I weighed these three 110/74 cranks, all weighed as just the arms (length as noted), no rings or BB

Sugino AT, 170 arms: 480gm. BTW, I suspect 175’s would weigh the same, the pedal hole would just be 5mm farther out
Ritchey Logic (early 90’s version, made by Sugino) with “hidden fifth arm”, 175 arms: 475gm
Specialized “flag”, 170 arms: 465gm

If one is counting grams, the AT takes the longest BB at 127.5. Lots of steel there.

Might not be considered sufficiently “vintage” - wife’s custom ‘96 Erickson had a very light and pretty set with “”ball-shaped” ends at both the pedal and spindle, but the brand name escapes me. DS crank was swaged to the spider, which was a weak point, but never a problem for her. Also, the pedal threads were blind, so some pedals couldn’t be used. Photo below:

Thanks for all this info!

I have a Sugino AT crank arm set I could use​​​​​, nice to know there isn't THAT much of a difference weight wise between those, the Ritchey logic ones, and the Flag crank. I had a very, very nice Flag Crank with BB that I just sold on eBay and I was starting to feel some sellers remorse but this helped a lot haha. Wish I could keep it all, that crank definitely would have stayed in the stash
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Old 07-27-21, 03:38 PM
  #35  
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Originally Posted by seypat View Post
The Sugino AT mentioned above is a very attractive crank. This one takes a 3U spindle. It took me a long time to find a bolted one. The Shimano 600 FC-6206 is a high quality, attractive crank. Somewhat hard to find in 170 crankarm size.

Luckily I have many spindles I've slowly accumulated, I usually have what I need!

I like the Shimano 600 triple that has been suggested. Hadn't seen one before. Very attractive crank.

As a Centurion owner I appreciate a nice Centurion- gorgeous bike!
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Old 07-27-21, 03:41 PM
  #36  
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Originally Posted by seypat View Post
I had to have a black crank for the latest build. This one is part of the Suntour X1 MTB group. It was made by Sakae or Sugino, though. I did some weight weenieing before I got it. It beat out some of the other black cranks, including some Shimanos. All of the ID marks on the components have been blacked out with a Sharpie.

That is a sharp looking bike. Nothing like a nice Centurion. Turbos are classy.
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Old 07-27-21, 03:49 PM
  #37  
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Originally Posted by cstar View Post
I love the AT, it would be amazing if you could weigh them!!!

Thank you all SO MUCH for all this info!! Love it. You given me tons of great options to ponder. I really appreciate it!
207 grams for the left crank, and 275 grams for the right.
The cranks are 170mm, but the same forging is used for 175mm, and maybe(??) for 165mm.







Steve in Peoria
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Old 07-27-21, 06:44 PM
  #38  
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Nothing stopping you from getting a "compact" or "semi compact" double. The small chainring gets you just about as low as a triple without tracking down a wide BB, and looks much more elegant. It's also totally compatible with some rear sprockets well into the 30's with a medium cage.

I just got this from Ben's Cycle and it's well made.

ETA- They have a sweet Sugino triple for 2 bills that looks "vintage" for the most part.

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Old 07-27-21, 07:10 PM
  #39  
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Originally Posted by Erzulis Boat View Post

Nothing stopping you from getting a "compact" or "semi compact" double. The small chainring gets you just about as low as a triple without tracking down a wide BB, and looks much more elegant. It's also totally compatible with some rear sprockets well into the 30's with a medium cage.

I just got this from Ben's Cycle and it's well made.

ETA- They have a sweet Sugino triple for 2 bills that looks "vintage" for the most part.
the sugino stuff is very good and looks right on an old bike. In terms of gear ratios, a triple may make more sense than a compact if running 5, 6, or 7 on the back. You can get the same highs and lows with a compact but you may lose smooth progressions. When you run more gears on the bike with modern gearing this problem disappears.
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Old 07-28-21, 07:26 AM
  #40  
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Originally Posted by gaucho777 View Post
Another possible option is the Red Clover Components triplizer ring (forum member @jonwvara):
https://www.redclovercomponents.com/
Yes, I have one mounted on a Stronglight 93:
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93-triple-3.jpg (214.7 KB, 249 views)
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Old 07-28-21, 08:04 AM
  #41  
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Originally Posted by JohnDThompson View Post
Yes, I have one mounted on a Stronglight 93:
That is such a pretty crank. Buying a 122 bcd triplizer is tempting. Finding those long stronglight spindles is not that easy though.
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Old 07-28-21, 08:18 AM
  #42  
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@JohnDJohnson - What an interesting mix of parts!
Did you swap the long cage on the RD?
Were you able to use the SL spindle?
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Old 07-29-21, 06:58 AM
  #43  
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Among vintage aluminum square-taper triple cranks, it's hard to think of one that would be lighter than the Rene Herse design. But after RH started making whole bikes, I don't know how many of his cranks were made for the aftermarket, so perhaps that doesn't count for this thread.


(Picture snarfed from https://saarf.london/2014/12/24/rene...ur-circa-1973/ )
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Old 07-29-21, 01:03 PM
  #44  
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A suggestion for several of these vintage cranks such as the Sugino AT and “Flag” cranks: Do a bit of stress relief filing and polishing where the DS arm meets the spider, as well as frequent inspections. That spot is known to develop tiny cracks that can lead to disastrous failure. Here’s what I did to the Flag cranks posted above:

Before:



After:

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Old 07-29-21, 03:25 PM
  #45  
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Originally Posted by SJX426 View Post
@JohnDJohnson - What an interesting mix of parts!
Did you swap the long cage on the RD?
Were you able to use the SL spindle?
The rear derailleur is a 3rd generation Rally; the long cage was stock. The front derailleur is a pre-CSPC Record. The bottom bracket spindle is a Stronglight 125mm triple spindle. Shifters are Simplex retrofriction downtube levers.
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Old 07-29-21, 09:32 PM
  #46  
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Originally Posted by 70sSanO View Post
For a 90’s triple crank with 110-74 I would think an XTR M900 would be pretty light. Couple it to a titanium BB and your in business.

I’d guess the M950 with the spider system might be lighter, but I’m not a pure C&Ver and even I have a tough time looking at it, especially after a few years of riding.

John
I have a M900 XTR crank on my Green Superior. These are hard to find, even in OK shape, but I managed to score a NOS set with 172.5mm arms. (I have nice friends.)

I don't know how much they weigh. Considering the size of my post-COVID belly... I don't care.

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Old 07-29-21, 10:48 PM
  #47  
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Originally Posted by Jeff Wills View Post
I have a M900 XTR crank on my Green Superior. These are hard to find, even in OK shape, but I managed to score a NOS set with 172.5mm arms. (I have nice friends.)

I don't know how much they weigh. Considering the size of my post-COVID belly... I don't care.

Early XTR stuff is so, so pretty. That finish looks like the bodywork on the 300SL Gullwing that you drive down Hwy 1 from Santa Cruz to Pismo Beach in your dreams... in Heaven.

Great Ghu, I think I need a cold shower.

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Old 07-29-21, 11:08 PM
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Originally Posted by seypat View Post
Here is something else to consider/look for. Some of these cranks came with smaller diameter holes/bolts for the third ring. The smaller bolts can be hard to find. Both the Sakae CR and Takagi Tourney AD pictured here have the small holes. (I don't know why the pic loaded upside down)


I agree on the CR. Velobase says the double with 170 arms was 596 grams. I have a CR triple with 175mm arms that weighs more than I expected but I think it's because the middle ring is bulky. Replacing it with a lighter one would make a difference.

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Old 07-30-21, 11:51 AM
  #49  
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Originally Posted by seypat View Post
Here is something else to consider/look for. Some of these cranks came with smaller diameter holes/bolts for the third ring. The smaller bolts can be hard to find.
I recently saw a crank with holes like that - unthreaded.

Can't remember what it was, but I remember thinking "if a fellow wanted a triple..."
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Old 07-30-21, 11:56 AM
  #50  
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Originally Posted by thumpism View Post
I'm a fan of the Stronglight 99, but could not tell you its weight.
I just weighed a pair of triples, both with rings and ring-bolts but nothing else:

Stronglight 99 28-40-52 668g
Nervar Star 38-47-54 733g

I suspect most of the difference is the Nervar having bigger rings in each position.
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