GRX Technical Documents
#1
- Soli Deo Gloria -
Thread Starter
Join Date: Aug 2015
Location: Northwest Georgia
Posts: 14,779
Bikes: 2018 Rodriguez Custom Fixed Gear, 2017 Niner RLT 9 RDO, 2015 Bianchi Pista, 2002 Fuji Robaix
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GRX Technical Documents
Shimano has published technical documents for the GRX line
https://si.shimano.com
Not earth shattering news but melacholic analytics like me find it interesting and I'm seeing the components available for pre-order with ETA 6/15/19.
-Tim-
https://si.shimano.com
Not earth shattering news but melacholic analytics like me find it interesting and I'm seeing the components available for pre-order with ETA 6/15/19.
-Tim-
Likes For TimothyH:
#2
Occam's Rotor
Thanks.
BTW it is "melancholic."
BTW it is "melancholic."
#5
Have you ever done a Shimano pre-order on a newly-introduced groupset? I have. My most recent was Ultegra Di2 disk. It once had a June ETA. Then it was August. Then late August. Then September. Then November. Then late November. Then December. Then the next February. Then . . . in February, I could get everything except the brifters and brakes. But I could get Dura Ace Di2 brifters and brakes, so I dug deep and paid myself out of my misery. If I had waited a couple more months, I could have had the whole groupset in Ultegra. 10 months after the original ETA. (And my new frameset sat in the LBS's storage for all those months.)
Adding to the frustration was that OEM bikes with the groupset installed were readily available for most of that time. Individuals don't get the goods until the OEM pipeline is full.
I hope it's different this time. But every Shimano new-intro groupset I've ever pre-ordered became a very, very long wait with lots of ludicrous ETA's. Don't believe the ETA until your LBS tells you the groupset has arrived and after you've had a chance to inventory the goods. Until then, it's just wishful thinking. (Don't sell your old stuff yet.)
Adding to the frustration was that OEM bikes with the groupset installed were readily available for most of that time. Individuals don't get the goods until the OEM pipeline is full.
I hope it's different this time. But every Shimano new-intro groupset I've ever pre-ordered became a very, very long wait with lots of ludicrous ETA's. Don't believe the ETA until your LBS tells you the groupset has arrived and after you've had a chance to inventory the goods. Until then, it's just wishful thinking. (Don't sell your old stuff yet.)
#6
Occam's Rotor
#7
Occam's Rotor
#8
Senior Member
Shimano has prioritized local shops for availability of new slx, xt, and grx. My local shop got all 3 in on Friday. I am waiting on drivetrain only XT which comes in next month to upgrade by XC bike.
#9
- Soli Deo Gloria -
Thread Starter
Join Date: Aug 2015
Location: Northwest Georgia
Posts: 14,779
Bikes: 2018 Rodriguez Custom Fixed Gear, 2017 Niner RLT 9 RDO, 2015 Bianchi Pista, 2002 Fuji Robaix
Liked 738 Times
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469 Posts
-Tim-
#10
Senior Member
#11
Senior Member
I don't want to start a new thread on this, so I figured I would continue this one.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
#12
Occam's Rotor
I don't want to start a new thread on this, so I figured I would continue this one.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
#13
Senior Member
I have an HG-800 (11-34, 11 speed) cassette on the way. With my 46/32 crankset, this will max out my derailleur capacity.
#14
Occam's Rotor
Is GS the mid-cage or short-cage? If it is the mid-cage, it will work fine. (I didn't even know about the 37T difference capacity.) (Just looked it up, I see that it is.) Several of us here have this kind of setup. It works fine. (I have one wheelset with a SRAM 11-36T and one with Shimano's newer 11-34T cassette. Both shift without issue.)
#15
FLIR Kitten to 0.05C
Join Date: Sep 2014
Location: Lincoln, Nebraska
Posts: 5,331
Bikes: Roadie: Seven Axiom Race Ti w/Chorus 11s. CX/Adventure: Carver Gravel Grinder w/ Di2
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I don't want to start a new thread on this, so I figured I would continue this one.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
#16
Senior Member
RD-RX400 SHIMANO SHADOW RD+
- Similar stabilizer technology and design as premium GRX series
- Compatible with existing Shimano mechanical 10-speed road ST
- Max. cassette range: 36-30T low)
- Max. front chainring range: 16T
- 41T capacity
- 303 g
Last edited by medic75; 07-16-19 at 06:49 AM.
#18
Senior Member
I don't want to start a new thread on this, so I figured I would continue this one.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
#19
Senior Member
I don't want to start a new thread on this, so I figured I would continue this one.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
Why does the Tiagra level RD RX400 have more capacity (41T) and a better max low gear (36T) capability than the higher level RD RX810? I would love the capability of a 46/30 crankset paired to a 11-36 cassette, but I feel a little weird removing an Ultegra RD 6800 GS & replacing it with a Tiagra level RD. To add insult to injury, I don't believe the newer 11 speed Shimano stuff is compatible with the 10 speed and lower stuff, but I could be wrong. I like that Shimano finally released this stuff, but this seems a little backwards.
#20
FLIR Kitten to 0.05C
Join Date: Sep 2014
Location: Lincoln, Nebraska
Posts: 5,331
Bikes: Roadie: Seven Axiom Race Ti w/Chorus 11s. CX/Adventure: Carver Gravel Grinder w/ Di2
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RD-RX400 SHIMANO SHADOW RD+
- Similar stabilizer technology and design as premium GRX series
- Compatible with existing Shimano mechanical 10-speed road ST
- Max. cassette range: 36-30T low)
- Max. front chainring range: 16T
- 41T capacity
- 303 g
#21
Senior Member
You are correct. I forget that not everyone lives where I do. The majority of the time my gravel bike's chain is wrapped around a 46T chainring. However, when it comes to long & steep gravel hills, I much prefer gear ratio below 1:1. For me, a gravel bike should have both mountain bike gearing and road gearing, which lead to my excitement of an RD with a 41T capacity and the ability to easily run an 11-36 cassette.
#22
Senior Member
Running an 11-36 cassete is nothing new, I dot it just fine on my Ultegra RX rear derailleur with an SLX 10 speed mountain bike cassete and RS405 10 speed hydraulic shifters, and I used to run the same system with a Tiagra 4700 rear derailleur. What I personly would like to be able to run an 11-42 mountain bike cassete with a 46-30 crankset, the same low 30x42 gear I have on my XC bike for the steep stuff and a 46x11 for the faster sections. I know people have been doing it with the ultegra RX rear derailleur but seems like quite a lot for the RD,
#23
Senior Member
Running an 11-36 cassete is nothing new, I dot it just fine on my Ultegra RX rear derailleur with an SLX 10 speed mountain bike cassete and RS405 10 speed hydraulic shifters, and I used to run the same system with a Tiagra 4700 rear derailleur. What I personly would like to be able to run an 11-42 mountain bike cassete with a 46-30 crankset, the same low 30x42 gear I have on my XC bike for the steep stuff and a 46x11 for the faster sections. I know people have been doing it with the ultegra RX rear derailleur but seems like quite a lot for the RD,