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Anyone using a 46/30T crank on a road bike?

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Anyone using a 46/30T crank on a road bike?

Old 10-12-19, 08:54 AM
  #451  
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Here we go up Brasstown!!! Crazy easy gear but Iím all in for it. Nice looking Niner.


Originally Posted by TimothyH View Post
Easton EC90 SL "Cinch" 46/30 cranks

CS-M8000 XT 11-42 mountain bike cassette using a 1.85 mm spacer on the freehub.

Ultetra R8000 GS derailleur with the B screw reversed.

19.5 inch low gear.




-Tim-
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Old 10-12-19, 04:37 PM
  #452  
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Originally Posted by marcoguzm View Post
It was a hassle to install all that, lots of adjustments, but I'm using the bike now. I can climb those hills with 13 - 14% grades, close to home. There is some rub at 30t chainring and higher gears, I can use the 46t chainring up to the 26t cog, without any rub. The shifters work fine, an Ultegra on the left, and a Dura Ace on the right.

It would be nice to have a Sugino crankset, but I've got to analyze this option. Now, I'm using the bike and doing those hills. On the flats I can accelerate pretty well with a 46t chainring, I'm 66, the ultegra crankset 53/39 was very tough on climbing for me, it was very good on the flats; it's much easier now with those mountains and hills close to home.
I've been using a FSA 46/30 with an 11-32 cassette for a couple of years, but this summer I encountered a couple of hills that had me struggling. So right now there's an 11-34 cassette down on my workbench that I'll install when I bring the bike in for the winter. One thing about the 46/30 is that I find that I'm pretty well spun out at between 25-30mph. On the other hand, I'm only going to see that speed going downhill when, at 73, I have no business pedaling to try to go faster!
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Old 10-12-19, 05:57 PM
  #453  
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DougG

You'll like the 11-34 cassette, and you can even find a Sun Race 11-36, though it's heavier. I've tried in some hills the 30/30 combo, but I can't sustain the pace for long. The 30/34 is good for tough climbs. And for those extremely hard climbs, I guess it would be better with a triple crankset, e.g. 42/32/22. I've got that combination in a Norco and a Breezer, Ritchey Logic steel, from the 90's.
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Old 10-13-19, 06:34 AM
  #454  
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Originally Posted by marcoguzm View Post
DougG

You'll like the 11-34 cassette, and you can even find a Sun Race 11-36, though it's heavier. I've tried in some hills the 30/30 combo, but I can't sustain the pace for long. The 30/34 is good for tough climbs. And for those extremely hard climbs, I guess it would be better with a triple crankset, e.g. 42/32/22. I've got that combination in a Norco and a Breezer, Ritchey Logic steel, from the 90's.
I thought about that, but the 11-34 is right at the limit of my rear derailleur capacity, although I could get away with it as long as I don't use gear combos that I shouldn't be using anyway, such as big-big. But actually I'm only going to encounter hills like that once or twice a year since 99.9% of my riding is close enough to flat that I have rarely even used my 30/32 gear combination.

Of course, I could always go wild and enter something like Michigan Mountain Mayhem, which has 10,000 feet of climbing on one of its routes, all of the short-but-very-steep variety (no actual "mountains" in Michigan!). It was a couple of these roads that really killed me this summer on a hot summer day (and I'm not getting younger at 73 and counting!).
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Old 11-12-19, 09:55 PM
  #455  
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I'm late to the party here, but I'm about to order a bike that comes with 46/30 chainrings: the new Felt VR series. In fact, that combo is available on three of their models, with three different cranks at different price points. The one I'm interested in uses a FSA SL-K Modular Adventure BB386EVO. They also use one in the Omega series branded Omega Adventure (BB30) that's on a Tiagra-level bike. The highest-end model uses a crank from Rotor with 46/30 rings. All come with 11-32 cassettes.

(I could have some details wrong here since bottom brackets are the mechanical area on a bike that I am least familiar with!)
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Old 11-27-19, 05:41 PM
  #456  
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Originally Posted by racknid View Post
I'm late to the party here, but I'm about to order a bike that comes with 46/30 chainrings: the new Felt VR series. In fact, that combo is available on three of their models, with three different cranks at different price points. The one I'm interested in uses a FSA SL-K Modular Adventure BB386EVO. They also use one in the Omega series branded Omega Adventure (BB30) that's on a Tiagra-level bike. The highest-end model uses a crank from Rotor with 46/30 rings. All come with 11-32 cassettes.

(I could have some details wrong here since bottom brackets are the mechanical area on a bike that I am least familiar with!)
That's exactly my bike:


At the time I bought it when it was first released, the VR5 came with a 48/32 crank, but the next year I replaced it with the FSA SL-K 46/30 that you mentioned. I really like this bike! It's great on all kinds of surfaces, nice and light carbon frame, and looks really good. I now have 700x32 Conti 4-seasons on it, which I found to be an improvement over the original 700x28s when riding on the gravel.

You're definitely making a good choice!
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Old 12-14-19, 04:24 PM
  #457  
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I’ll be installing my FC-RX810 48/31 on my Canyon Endurace this week. The bike now has a Ultegra R8000 50/34 with an 11-32 cassette. I rarely pedal at speeds higher than 35mph and I like the idea of staying on the big ring except on longer climbs of 5% or more. There are numerous 10-15% climbs in my area, so the 31/32 low gear will allow me to stay seated and spin my way to the top.


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Old 12-16-19, 10:14 AM
  #458  
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Originally Posted by Barrettscv View Post
Iíll be installing my FC-RX810 48/31 on my Canyon Endurace this week. The bike now has a Ultegra R8000 50/34 with an 11-32 cassette. I rarely pedal at speeds higher than 35mph and I like the idea of staying on the big ring except on longer climbs of 5% or more. There are numerous 10-15% climbs in my area, so the 31/32 low gear will allow me to stay seated and spin my way to the top.


Nice looking crankset!
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Old 12-20-19, 09:45 AM
  #459  
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The GRX cranksets are an excellent match with disc brake bikes like the Endurace. The chain line is about 2.5 mm further offset than the r8000 Ultegra crankset. This works with the 142mm thru-axle but would probably not be as functional with a rim brake bike. I also installed the matching GRX front derailleur. The results are seen below. I’ll probably upgrade the rear derailleur the next time I install a new chain. However, changing the rear derailleur is not required unless other changes, like a 11-36 cassette are also planned.


Looking correct, this is a functional and aesthetic improvement over the Ultegra

Crankarm a clears the chain easily while on the big chainring and small cog

Chain line on the small-small combination. No contact or interference

Derailleur arm while on the small-small combination

Derailleur arm on the big-big combination
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Old 12-29-19, 06:52 PM
  #460  
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Well that example of GRX on an existing Ultegra bike kind of seals the deal for me. Looks like my 2003 Airborne is already topped out and I'll be picking up a new T-Lab Ti that's built for discs and a 17 year newer drive-train. I was kind of hoping I could swap out to GRX crank and derailleur on the front (with a hydraulic front brake). There's nothing wrong with my Ti frame other than it is showing the limits of the available designs in 2003.

Of course that's me complaining that my road bike ONLY lasted 17 years...
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Old 12-29-19, 07:55 PM
  #461  
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Originally Posted by SCTinkering View Post
Well that example of GRX on an existing Ultegra bike .
In my case, it is an Ultegra Di2 derailleur with a band-clamp on a steel frame (uniform seat tube allows me to re-position the derailleur height). So YMMV, but it is at least worth a try.
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Old 02-07-20, 03:52 AM
  #462  
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Hi all,

It's been very interesting reading this thread. I'm wanting to covert my current Shimano 105 5800 50/34 setup to some kind of 46/30 setup (got a sportive coming up with cobbled climbs).

@Barrettscv, @wgscott, do you think there's no way the GRX chainset and front derailleur combo would work with a rim brake frame?

I think my only other option is the Absolute Black 46/30 chainrings, fitting them onto my current crank, but they're pricey!

Thanks
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Old 02-07-20, 07:25 AM
  #463  
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Originally Posted by mikemjd View Post
Hi all,

It's been very interesting reading this thread. I'm wanting to covert my current Shimano 105 5800 50/34 setup to some kind of 46/30 setup (got a sportive coming up with cobbled climbs).

@Barrettscv, @wgscott, do you think there's no way the GRX chainset and front derailleur combo would work with a rim brake frame?

I think my only other option is the Absolute Black 46/30 chainrings, fitting them onto my current crank, but they're pricey!

Thanks
I've installed a 48/31 Shimano GRX chainset on a disc brake bike, my Canyon Endurace. I've also installed a 46/30 Absolute Black oval chainring set in my Ridley Helium SLX. I used a Shimano Ultegra 6800 crankset with the Absolute Black rings on a Ridley rim brake bike with SRAM Red eTap 2x11 drivetrain.

The Absolute Black chainring set worked well enough but had a few issues. The chainrings are set inward toward the derailleur providing a chainline that is different than OEM but not really a problem. I had to use all of the adjustment on the inner set screw to position the derailleur cage correctly. I found that the shifting of the chainrings was a little more fussy than the OEM chainrings and was audibly louder than OEM. I also dropped the chain once a day.





I transferred the chainrings and crankset to bike with an Ultegra 6800 drivetrains and had far fewer problems. I don't think the Absolute Black chainrings were a good match with the electric shifting but was very good with Shimano mechanical shifting.

You could try to install the GRX crankset on a rim brake bike, it will install without modifications needed. You will need to use the matching GTX front derailleur. The chainline on the big-big combination will be extreme and should probably be avoided.

Last edited by Barrettscv; 02-07-20 at 04:44 PM.
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Old 02-07-20, 07:56 AM
  #464  
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Originally Posted by Barrettscv View Post
I've installed both a 48/31 Shimano GRX chainset on a disc brake bike, my Canyon Endurace. I've also installed a 46/30 Absolute Black oval chainring set. I used a Shimano Ultegra 6800 crankset with the Absolute Black rings on a rim brake bike with SRAM Red eTap 2x11 drivetrain.

The Absolute Black chainring set worked well enough but had a few issues. The chainrings are set inward toward the derailleur providing a chainline that is different than OEM but not really a problem. I had to use all of the adjustment on the inner set screw to position the derailleur cage correctly. I found that the shifting of the chainrings was a little more fussy than the OEM chainrings and was audibly louder than OEM. I also dropped the chain once a day.





I transferred the chainrings and crankset to an Ultegra 6800 drivetrains and had far fewer problems. I don't think the Absolute Black chainrings were a good match with the electric shifting but was very good with Shimano mechanical shifting.

You could try to install the GRX crankset on a rim brake bike, it will install without modifications needed. You will need to use the matching GTX front derailleur. The chainline on the big-big combination will be extreme and should probably be avoided.
Thanks for getting back to me Barrettscv, sounds like you have some nice bikes! I'm going to add an electronic bike as soon as the right one comes up.

Going from what you've said, it sounds like the Absolute Black rings on my mechanical groupset would be the best idea, I do feel like I want to try the GRX setup up though.

It really is a surprise to me why more people don't ride these gears, especially in locations with so many great climbs.

Last edited by mikemjd; 02-07-20 at 01:41 PM.
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Old 02-07-20, 06:26 PM
  #465  
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I was finally able to do several rides using my new GRX 46/30 crank and compatible FD. I wasn’t happy with how I’d setup the FD. The trim was working so there was a lot of chain rub on the big ring and smaller cogs. Plus to go from the 46 to the 30 took pushing the FD lever twice. That was really inconvenient when going from a quick downhill to a steep uphill.

The FD height was okay but I adjusted the lower limit screw so the inside plate on the FD moved closer to the frame. That allowed me to better align the two lines on the FD. Everything is shifting as it should now. For whatever reason I never seem to be able to get a FD adjusted the first time around.
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Old 03-19-20, 04:47 PM
  #466  
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I am installing a grx crankset with a 68mm bottom bracket. Do I need any spindle spacers? Looking online it seems that I should always have then for any hollowtech ii, but the grx installation guide doesn't mention any.
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Old 03-22-20, 08:25 PM
  #467  
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Originally Posted by hikerbikerguy View Post
I am installing a grx crankset with a 68mm bottom bracket. Do I need any spindle spacers? Looking online it seems that I should always have then for any hollowtech ii, but the grx installation guide doesn't mention any.
I did not need any with mine.
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Old 03-22-20, 08:27 PM
  #468  
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Originally Posted by mikemjd View Post
Hi all,

It's been very interesting reading this thread. I'm wanting to covert my current Shimano 105 5800 50/34 setup to some kind of 46/30 setup (got a sportive coming up with cobbled climbs).

@Barrettscv, @wgscott, do you think there's no way the GRX chainset and front derailleur combo would work with a rim brake frame?

I think my only other option is the Absolute Black 46/30 chainrings, fitting them onto my current crank, but they're pricey!

Thanks
Probably too late, but I don't see why it wouldn't work with a rim brake frame. Chain line?
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