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Praxis Zayante vs GRX chainline

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Praxis Zayante vs GRX chainline

Old 10-16-20, 04:19 PM
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Bikegeek1968
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Praxis Zayante vs GRX chainline

I have a stock 2020 Giant Revolt 0. It came with Ultegra drivetrain and shifting, but has a Praxis Zayante crankset. For "reasons", I want to replace it with a GRX set, but I cannot find any info on the chainines of each set. I know the GRX is 2.5mm outboard of the Ultegra, and Shimano says you need a GRX front derail too. I assume the Praxis has a similar line as the Ultegra, but I just can't confirm it.

Does anyone have some real world experience with this?
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Old 10-16-20, 05:18 PM
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dwmckee
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The Ultegra and Praxis should have same chainline and GRX will be 2.5mm wider. In some cases you can make existing Ultegra front derailleur work, but go GRX front der to be sure. Same shifters will work.
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Old 10-16-20, 07:00 PM
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146mm for the Ultegra, 147mm for the Praxis, and 151mm for the GRX 810 are the Q-factors I came up with.

If by chance you end up with a 172.5mm 48/32 Zayante crank for sale, I'd be interesting in buying it!
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Old 10-16-20, 09:33 PM
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My 2021 Revolt has a Praxis crank and GRX derailleurs, not sure if there's a spacer involved or not, but it works.
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Old 10-17-20, 06:36 PM
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Originally Posted by Rides4Beer View Post
My 2021 Revolt has a Praxis crank and GRX derailleurs, not sure if there's a spacer involved or not, but it works.
Thanks for the info, people.
I am not sure what I am going to do once I get the warranty parts, but since I am lazy I will probably just put the Praxis back on. They are 175 anyway. If I break another spider then I'll go GRX, and probably just get a new derail at the same time.
As for the 2021 Giant Propel with GRX shifting, I saw that in the spec sheet a few weeks ago. I wonder why they are using the Praxis crankset. Maybe Giant bought a whole pile in 2020 and still need to use them all? Since the Praxis rings are farther inboard than the GRX rings, I assume the GRX front derail has a bit more adjustability than the Ultegra, at least as far as moving inward is concerned.
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Old 10-18-20, 08:43 AM
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Originally Posted by Bikegeek1968 View Post
Thanks for the info, people.
I am not sure what I am going to do once I get the warranty parts, but since I am lazy I will probably just put the Praxis back on. They are 175 anyway. If I break another spider then I'll go GRX, and probably just get a new derail at the same time.
As for the 2021 Giant Propel with GRX shifting, I saw that in the spec sheet a few weeks ago. I wonder why they are using the Praxis crankset. Maybe Giant bought a whole pile in 2020 and still need to use them all? Since the Praxis rings are farther inboard than the GRX rings, I assume the GRX front derail has a bit more adjustability than the Ultegra, at least as far as moving inward is concerned.
You snapped a Zayante spider?
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Old 10-19-20, 09:22 AM
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Originally Posted by mstateglfr View Post
You snapped a Zayante spider?
Yes. A few months ago I started chasing a load cracking noise whenever I pedaled hard, it did not happen all the time. Soon after, I folded my small chainring when under high power, low RPM and on a steep hill. I weigh 190 and put out a lot of power. Praxis sent me a new ring right away. Cut to a few days ago, I am still chasing the noise. Cleaned out the BB, Headset, seatpost, bars, stem. Nothing. So I am just staring at the bike and I see it. A hairline crack almost all the way through one of the spider arms. This is also when I bent the chainring months back. I always thought it was odd that it bent at a bolt, but now it makes sense. Upon cleaning and removal, one of the other arms also has a crack. Praxis sent a complete ring/spider kit, hopefully this one works out. I only have about 40 rides on the bike, and the noise/crack probably happened after only 15 rides. We'll see
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