Shimano GRX gravel group
#26
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31 is prime, it only "lines up" once per rotation. Bet you a Happy Meal that 48-32 would line up better...
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Genesis 49:16-17
Genesis 49:16-17
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Can someone explain to me how this compares with my Ultegra 2X drivetrain with 48-32 chainrings, Ultegra RX rear derailleur? Any advantages running GRX 2x over my existing Ultegra? BTW I have a Giant Revolt gravel bike.
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So....honest question do we pronounce this "gurcks"? Is it pronounced as individual letters?
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#38
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GRX has several tiers.
Ultegra Di2 is RX815
Ultegra Mechanical is RX810
105 is RX600
Tiagra 10 speed is RX400
My question is whether RX815 components will play well with 8050 components from an electronic perspective.
-Tim-
Ultegra Di2 is RX815
Ultegra Mechanical is RX810
105 is RX600
Tiagra 10 speed is RX400
My question is whether RX815 components will play well with 8050 components from an electronic perspective.
-Tim-
Last edited by TimothyH; 05-07-19 at 09:37 PM.
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My old gravel bike I scraped the FSA for a CX 50 crank aka Shimano with Dura Ace BB, night and day difference the rest of the bike was already Ultegra 10 speed. I’m a Shimano fan and I have SRAM bikes I just know how to service Shimano components.
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Geez y’all made me get out my Shimano fishing reels. Oh no Shimano has the best long distance surf casting reel mankind has ever had. My Ultegra 50-34 was revolutionary now that is so yesterday Same old gears just different ratios.
#42
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For example, consider the fact that a chain has narrow inner links and wide outer links, and that there are "two ways" of aligning the chain on a chainring.
Suppose that all of the pins on the big ring are positioned to "catch" a wide outer link upon a specific tooth alignment between the two chainrings. This might work perfectly every time if the chain is in one of its two possible alignments, but the pins would always miss badly if the chain is in the other alignment.
Chainring manufacturers need to design around stuff like this. And, there are different approaches to designing shift gates. Some manufacturers make 48-32 combos that seem to shift fairly well, but it wouldn't surprise me if Shimano's approach attained better shifting with a different small ring. And when it comes to front shifting, they seem to know what they're doing.
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Get on that bike ride 100 miles a week for one year then come back and talk about gear ratios someone quoted that phrase so I don’t want to steal it but it is a great quote. Makes a lot of sense.
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Wont be that much different, the hoods have a different shape to them which is suposed to give you a more secure grip on the rough stuff and the front mech is a bit wider to acomodate wider tires.
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That does appear to be the intent. You can see they're quite a bit different. They're also notable for having a clutch like a MTB derailleur.
The 11-42 is the XT M8000 version which means we'll have 11-42 cassettes around for at least another generation. Whew! Was worried they'd be Eagle'd away. But also means a road hub will need a spacer, since the MTB stuff never went away from the 8-9-10 speed freehub width.
RD-RX810 Search in Compatibility
The 11-42 is the XT M8000 version which means we'll have 11-42 cassettes around for at least another generation. Whew! Was worried they'd be Eagle'd away. But also means a road hub will need a spacer, since the MTB stuff never went away from the 8-9-10 speed freehub width.
RD-RX810 Search in Compatibility
I still am not sure if I can use the RX-812 rear mech with a 2x setup and an 11-42 cassete. That would be the ideal setup, same 42-30 low gear I have on my XC bike with a bigger gear for road riding. Things can get real steep around here and is not smooth at all. And we're having to ride on tarmac longer and longer to reach the off road stuff its a drag on a mountain bike.
#46
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I still am not sure if I can use the RX-812 rear mech with a 2x setup and an 11-42 cassete. That would be the ideal setup, same 42-30 low gear I have on my XC bike with a bigger gear for road riding. Things can get real steep around here and is not smooth at all. And we're having to ride on tarmac longer and longer to reach the off road stuff its a drag on a mountain bike.
The B screw is turned around and a 1.85 mm spacer used behind the cassette to fit road hubs. Front rings are 46/30. An entire 116 link chain is used.
No wolftooth is used. It shifts fine.
-Tim-
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If you don't like the 800 series 31 tooth ring then get the 600 series with a 30 tooth ring and run it with the rest of the 800 series components.
You gain a few grams and have to piece everything together. Those who feel like one tooth is going to make the difference are probably willing to do so.
-Tim-
You gain a few grams and have to piece everything together. Those who feel like one tooth is going to make the difference are probably willing to do so.
Dave: We hope to see more gearing options in the future. We’ll watch to see how the first generation plays out. We’re already hearing that a 38T option for 1x would be good to produce. The 1x group, in particular, plays well in cyclocross and 38T chainrings are a popular choice there. Additionally, I’d like to see the 46/30 chainrings later on in the 800 series.
Read More...
Read More...
-Tim-
#48
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Q&A with Shimano Engineers about this groupset.
https://gravelcyclist.com/bicycle-te...-grx-groupset/
It is a good read and the engineers seemed to have been bitten by the gravel bug themselves. Their answer's are actually quite reasonable, not just marketing crud.
-Tim-
https://gravelcyclist.com/bicycle-te...-grx-groupset/
It is a good read and the engineers seemed to have been bitten by the gravel bug themselves. Their answer's are actually quite reasonable, not just marketing crud.
-Tim-
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If the 2x10 RX400 derailleurs are actually compatible with 10 speed road shifters, and not Tiagra's 10 speed cable pull, I'm really stoked. I could finally use my 10-speed barcons, indexed, with a clutch mech. My current crankset is fine, but I'd for sure get a matching RX600-10.
Edit: too good to be true. According to this Bicycling article, the 10 speed stuff is compatible with Tiagra 4700. Big bummer!
Edit: too good to be true. According to this Bicycling article, the 10 speed stuff is compatible with Tiagra 4700. Big bummer!
#50
Chases Dogs for Sport
I'm pretty surprised this hasn't come up yet. Shimano is sadly notorious for "introducing" components that don't see the market for 12+ months. What's the over/under on how many months it will take these components to actually come to market? I know what the article says . . . Shimano always says that. (Shimano doesn't have road 1x YET. It's not real until it's no longer a "pre-order.")
My guess (sadly) is that some cable-actuated components arrive in stores in November/December and most of the components will be in stores by February/March. The components I want most? I'm thinking May, 2020, if then.
(SOMEBODY tell the bike and component companies -- You lose an awful lot of potential product momentum when your product "introductions" happen a full year or more before customers can buy the product. STOP IT!!)
My guess (sadly) is that some cable-actuated components arrive in stores in November/December and most of the components will be in stores by February/March. The components I want most? I'm thinking May, 2020, if then.
(SOMEBODY tell the bike and component companies -- You lose an awful lot of potential product momentum when your product "introductions" happen a full year or more before customers can buy the product. STOP IT!!)
Last edited by FlashBazbo; 05-08-19 at 10:37 AM.