CYCLINGFORUM.COM - Where Cyclists Talk Tech --- Return To Home

 

    Register FAQ'sSearchProfileLog In / Log Out

 

****

cyclingforum.com ****

HOMECLUBS | SPONSORS | FEATURESPHOTO GALLERYTTF DONORS | SHOP FOR GEAR

Return to CyclingForum Home Page CYCLING TECH TALK FORUM
          View posts since last visit

Asymmetrical 4 bolt Shimano 30/46 chainring set.
 

Author Thread Post new topic Reply to topic
Sparky
Joined: 08 Dec 2003
Posts: 17462
Location: Portland, OR

7/27/19 3:40 PM

Asymmetrical 4 bolt Shimano 30/46 chainring set.

Happy to see this option for the 4 arm asymmetrical 110BC 11s Shimano chainsets.

7075 Forged T6, should be decent wearing, came today for the 'climbing bike'. Such as climbing is for me. ;o

I was hoping the Ultegra 46T from the CX chainset I have might work with the 30t, but the way the bolts threaded into the inner ring make that a no go.






https://www.ebay.com/itm/bikinGreen-CNC-Road-Chainring-46-30T-BCD-For-4-Arms-Shimano-9-11-Speed/113800283451?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

 Reply to topic     Send e-mail

Nick Payne
Joined: 10 Jan 2004
Posts: 2439
Location: Canberra, Australia

7/28/19 6:02 AM

Shimano now sell a crankset that comes as standard with with 46-30 chainrings: https://bike.shimano.com/en-US/product/component/grx-10-speed/FC-RX600-10.html .

I prefer 42-30 or 42-29 myself, so I use 94 BCD cranks, as there are plenty of NOS chainrings around to fit that size:

<a href='https://photos.google.com/share/AF1QipMuVcXcIFCm-X1LKY3DiTVqCsVtDOmQvNj56xfzFOUFyFJUaiEUtzWT0Qqim7xlqg?key=WVk1aTZ0T3cycTR2Qk03S1FMd3p6eTBlRmdjazNR&source=ctrlq.org'><img src='https://lh3.googleusercontent.com/iUsN6mYVeFMzHQYTh5WxgPQHL4_2GNahmGpJZ2933kQmlI826Rvq_RnLIQ7PrZwxtD2nwE_EqwvHWQAid1B5Ad-bkByehP4V27vPdn2X--TjDfUOlIZk9XMq0aK_ZMnBzaHyGZ9r0Vk=w1200' /></a>

<a href='https://photos.google.com/share/AF1QipOmegscorsDMRKnkO1wlzjlUyZifLbZzUx3biVQtbzK6EJ7JdlVujZ8-0k8q_5srQ?key=YUUwQkFub1JSXzlBUEhaMFFhU1ctaVhPdXBBVEdB&source=ctrlq.org'><img src='https://lh3.googleusercontent.com/3c-6n89j7spzY0dDESNZO3xgE-u24_fuSCuj15SyChrMORstbiPclDLjpcVoGLB46sYSxrmZ4SRdawNy4pDEpTgL7ykDuZ_9QU0KFbJsj3ODMB4oELkntdSZIbUIJG1j6PA2eYrlKQ=w1200' /></a>

 Reply to topic    

Sparky
Joined: 08 Dec 2003
Posts: 17462
Location: Portland, OR

7/28/19 12:24 PM

Decent looking too, for more modern chainset, a peeve of mine. ;) I had not seen that chainset though, thanks for the link.

My 28/42 on The Gravel Mongrel is CX1 with a MTN spider, 4 bolt. 104? This 30/46 set is a nice plug and play option for a road climber with all 68## Di2 on it.

Also I assume once installed the Di2 front shifting with 'make' it shift fast and furious. I say that as compared to Rotor Ovals 36/53 Di2 VS Cable shifting. The Di2 speed up the shift with deterministic fashion over cabled shifting.

Side note: #weight-weenie The 6800 with these rings/bolts is same as orig 36/46, I used a 34t with the 46T orig, that must save a whole 5 grams too!. ;)

So 122-4 grams less than that Gravel chainset. #confessAMweightweenie.

 Reply to topic     Send e-mail

Brian Nystrom
Joined: 26 Jan 2004
Posts: 4498
Location: Nashua, NH

7/29/19 7:55 AM

I think you're comparing apples to oranges Sparky. Oval rings are notorious for slow shifting, since there are only two points on the rings where the front derailleur is in close enough proximity to shift well. I don't see how Di2 would make any difference, as I don't find it to perform any better than mechanical systems; it just requires less effort.

 Reply to topic    

Sparky
Joined: 08 Dec 2003
Posts: 17462
Location: Portland, OR

8/10/19 11:02 AM

Brian, used QRings on both Di2 and Cabled, noticeably better faster shift Di2. Just sharing the experience regardless of conceptually not being of advantage...

Rings on, FD already low in the slot on the braze on [rivet on] hanger. Not nuts about the space to the ring, but more space on the ovals with no issues

So we will see behavior on the road VS stand later today. I suspect a lot less shifting the front and a lot more being parked in the 46 to be the case...

 Reply to topic     Send e-mail

Sparky
Joined: 08 Dec 2003
Posts: 17462
Location: Portland, OR

8/21/19 9:39 AM

Update

After a handful of rides, no shifting issues. Not quite as smooth a drop to the little ring as the 34/0 SH rings. But as I said above re Oval rings, the Di2 has no issue. I got two set and will try [eventually] the other set on a cabled shifting bike and report.

Note: I had tried 34/46 with the Ultegra CX rings, subst the 34 for the 36 the chainset comes with. With those I tried a Sunrace 11-36 cassette to get lower, but for anything but loose riding I did not like the ratios.

This is the gear chart on the Domane with the 30/46_11-32. I have not noticed spacing on the rear cog annoying, but road use and sitting in the 46t front 99-44/100 of the time thus far.

I did do a test climb the other day and the extra low gear kept me seated on something I usually have to stand on. I went up it slower though...

 Reply to topic     Send e-mail


Return to CyclingForum Home Page CYCLING TECH TALK FORUM
           View New Threads Since My Last Visit VIEW THREADS SINCE MY LAST VISIT
           Start a New Thread

 Display posts from previous:   


  
Last Thread | Next Thread  >  

  
  

 


If you enjoy this site, please consider pledging your support

cyclingforum.com - where cyclists talk tech
Cycling TTF Rides Throughout The World

Cyclingforum is powered by SYNCRONICITY.NET in Denver, Colorado -

Powered by phpBB: Copyright 2006 phpBB Group | Custom phpCF Template by Syncronicity