Shimano GRX 48-31T, 46-30T - RX810, RX600, RX400

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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Hex
Posts: 108
Joined: Sun Sep 09, 2018 10:30 am

by Hex

tomh79 wrote:
Sat May 11, 2019 8:10 pm
Thanks! Thinking about 2x with a SRAM 11-36 cassette...With 30/46...
How do you get 30/46 front?

I'm struggling to find that combo with an xtr crankset from the 980/985 doubles in 165mm...

Edit: nevermind. I'm being an idiot. That's just me frustrated with searching for a mtb crank to work with an mtb di2 FD. Ignore this.

tomh79
Posts: 86
Joined: Thu Dec 27, 2018 9:50 pm

by tomh79

Hex wrote:
Sun May 12, 2019 2:32 pm
How do you get 30/46 front?

-Easton EC90 SL (want it! but way too expensive for me)
-Use Ultegra or Dura Ace crank with Absolute Black chainrings
-FSA SL-K Adventure Carbon
-Upcoming Shimano GRX (31/48)

also check this thread: I posted a comparison by a German magazine there viewtopic.php?f=4&t=156669&p=1486471#p1486471
Last edited by tomh79 on Sun May 12, 2019 7:45 pm, edited 1 time in total.

by Weenie


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TonyM
Posts: 3083
Joined: Thu Jan 22, 2015 4:11 pm

by TonyM

Hex wrote:
How do you get 30/46 front?

I'm struggling to find that combo with an xtr crankset from the 980/985 doubles in 165mm...

Edit: nevermind. I'm being an idiot. That's just me frustrated with searching for a mtb crank to work with an mtb di2 FD. Ignore this.
Why don’t you use the GRX 46/30 crankset?

tomh79
Posts: 86
Joined: Thu Dec 27, 2018 9:50 pm

by tomh79

Is 46/30 really only available with the lower end Shimano GRX group?

-Crankset FC-RX810-2 (2x),48-31T, 2×11 , 722 grams
-Crankset FC-RX600-11 (2x), 46-30T, 2×11, 816 grams

Hex
Posts: 108
Joined: Sun Sep 09, 2018 10:30 am

by Hex

tomh79 wrote:
Sun May 12, 2019 5:43 pm
Hex wrote:
Sun May 12, 2019 2:32 pm
How do you get 30/46 front?

-Easton EC90 SL (want it! but way too expensive for me)
-Use Ultegra or Dura Ace crank with Absolute Black chainrings
-FSA SL-K Adventure Carbon
-Upcoming Shimano GRX (31/48)

also check this thread: I posted a comparison by a German magazine there viewtopic.php?f=4&t=156669&p=1486471#p1486471
Looked at the FSA sl-k as well. Looks mean AF. Priced between an Ultegra and DA and weight like DA. It is a strong contender if I can find it at a reasonable price.

Not keen on the Oval AbsoluteBlack stuff. I really like their round cx ring, though! Was seriously thinking of getting their 38 or 42t rings and swap between those and my current 52 force1 as needed for gravel/road.

Edit: I've also come to the realisation that if I really wanted to use the xtr RD for 42t at the back and a road crank, I need a mechanical set up witha wolftooth tanpan. If I want di2, I need to have that xtr crankset from the gods that has that 44/30...

Hex
Posts: 108
Joined: Sun Sep 09, 2018 10:30 am

by Hex

TonyM wrote:
Sun May 12, 2019 6:11 pm
Hex wrote:
How do you get 30/46 front?

I'm struggling to find that combo with an xtr crankset from the 980/985 doubles in 165mm...

Edit: nevermind. I'm being an idiot. That's just me frustrated with searching for a mtb crank to work with an mtb di2 FD. Ignore this.
Why don’t you use the GRX 46/30 crankset?
Can do but wanted to see if I can match 2 di2 mtb derailleurs to get 11-40/42 and 44/30

Also, if going mechanical (where I can use a road front derailleur) I can just try to find other round rings for my current crankset (red 22 with hidden bolt) and save money instead, although I'm having a hard time finding either a sub-compact or compact kit for 130bcd hidden bolt non-oval.

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prebsy
Posts: 852
Joined: Tue Oct 23, 2012 10:52 pm
Location: PHL

by prebsy

nickf wrote:
osw000 wrote:
Sat May 11, 2019 8:36 am
MichaelB wrote:
Sat May 11, 2019 3:07 am
nickf wrote:
Fri May 10, 2019 1:13 pm
What kind of terrain you guys riding that you need 46/30 with a 42 out back? Honest question though. I'm a flat lander and run regular road gearing on gravel.
Many of the local dirt tracks here have sustained 12-17% gradients and are also often technical & rutted/rocky.
Sounds like MTB terrain
Ditto. That sounds brutal and a MTB would be my choice for that terrain. Ill bring the full suspension MTB if I know an event or course is technical because you can plow through the rough stuff, and not picking through it on a road bike with big tires.

This is where the term "gravel" riding gets blurred. Single track and gravel riding are 2 different things. For me gravel is a mixture of road and a hardpack dirt, clay, gravel, crushed shell surface. Relatively smooth to a certain degree. I know on my compact 2x setup with a 11-26 I can comfortably ride 12ish% grades. On the flip I can still hit the flats in the mid 20mph range with a good cadence. So with this gearing and 45c tires your just building a rigid mountain bike that happens to have drop bars, not a gravel rig.
Lol this thread could just be an argument of the definition of "gravel".

I personally use mine from everything from mtb to fast road riding (650*2.0 + 700*28). The grx gearing is getting close to what people need to achieve this.

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MichaelB
Posts: 574
Joined: Tue Apr 22, 2008 4:31 am

by MichaelB

nickf wrote:
Sat May 11, 2019 5:24 pm

osw000 wrote:
Sat May 11, 2019 8:36 am


Sounds like MTB terrain
Ditto. That sounds brutal and a MTB would be my choice for that terrain. Ill bring the full suspension MTB if I know an event or course is technical because you can plow through the rough stuff, and not picking through it on a road bike with big tires.

This is where the term "gravel" riding gets blurred. Single track and gravel riding are 2 different things ....
Yes they are, but the tracks I ride are those that are in my back yard. I live at the base of the Adelaide Hills, and the dirt tracks are what they are. Requires some road to get there as well (and up hills at times too).

A MTB would be better on some tracks, but heavier. Hence my choice of the Slate - a mix of both. :-)

fourfa
Posts: 14
Joined: Mon Sep 26, 2011 3:04 am

by fourfa

tomh79 wrote:
Sat May 11, 2019 8:10 pm
Thanks! Thinking about 2x with a SRAM 11-36 cassette...With 30/46...
I've been riding this very happily with DA 9120 shifters, DA 9100 FD, Ultegra RX800 RD, FSA SL-K 46/30 crank (630g). 11-36 on my 650B x 47 gravel wheels, 11-32 on my 700C x 28 road wheels. Shifting is great. No experience with GRX yet, but I imagine it has to be the same or better?

Kinda hoping the new FD design will let me get away with a 48/30 combo on the FSA crank (the 48/32 and 46/30 sets can mix and match). 46/30 and 11-36 is 2 over capacity, shifts great, still has some extension in the RD on big-big without going slack on small-small; what's two more?

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MayhemSWE
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Location: Stockholm, Sweden

by MayhemSWE

Hex wrote:
Sun May 12, 2019 8:23 pm
Also, if going mechanical (where I can use a road front derailleur) I can just try to find other round rings for my current crankset (red 22 with hidden bolt) and save money instead, although I'm having a hard time finding either a sub-compact or compact kit for 130bcd hidden bolt non-oval.
For obvious reasons you are never going to find such chainrings. Can't have a chainring where the diameter of the teethed part is less than the BCD.

mattr
Posts: 4601
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

MayhemSWE wrote:
Mon May 13, 2019 6:57 am
For obvious reasons you are never going to find such chainrings. Can't have a chainring where the diameter of the teethed part is less than the BCD.
Like searching for odd tooth count narrow wide rings......

tomh79
Posts: 86
Joined: Thu Dec 27, 2018 9:50 pm

by tomh79

fourfa wrote:
Mon May 13, 2019 6:55 am
I've been riding this very happily with DA 9120 shifters, DA 9100 FD, Ultegra RX800 RD, FSA SL-K 46/30 crank (630g). 11-36 on my 650B x 47 gravel wheels, 11-32 on my 700C x 28 road wheels. Shifting is great. No experience with GRX yet, but I imagine it has to be the same or better?
How do you like that FSA crank? Also thinking about buying it...Easton wouuld be best I suppose but so expensive. 48/30 combo with 11-36 would be awesome. Wondering if it would work - since Shimano will release a 31/48 - if they could make it work with the new FD...they probably would have released a 30/48...
Last edited by tomh79 on Mon May 13, 2019 1:25 pm, edited 1 time in total.

Hex
Posts: 108
Joined: Sun Sep 09, 2018 10:30 am

by Hex

MayhemSWE wrote:
Mon May 13, 2019 6:57 am
Hex wrote:
Sun May 12, 2019 8:23 pm
Also, if going mechanical (where I can use a road front derailleur) I can just try to find other round rings for my current crankset (red 22 with hidden bolt) and save money instead, although I'm having a hard time finding either a sub-compact or compact kit for 130bcd hidden bolt non-oval.
For obvious reasons you are never going to find such chainrings. Can't have a chainring where the diameter of the teethed part is less than the BCD.
Yep. Just noticed that last night!
Shame i can't even find have the large chairing with a 50!
50/39 i can handle with a 11/40 at the back.

Man. Another set of cranks....
I really want to keep mine.
Maybe I'll just set it up with di2, 1x and be done with it...
It'll probably be cheaper for me to get a sram xd body for a 10t cog...

Aahhh

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MayhemSWE
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Location: Stockholm, Sweden

by MayhemSWE

Hex wrote:
Mon May 13, 2019 10:55 am
Shame i can't even find have the large chairing with a 50!
50T chainrings with 130 BCD is available from Specialities TA, Stronglight and others. Don't think I have seen any that matches the hidden-bolt orientation though, so the chain catcher pin would end up opposite the crank arm.

by Weenie


mattr
Posts: 4601
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

TA certainly have rings with movable catch pins.

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