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PostPosted: Sat Apr 13, 2013 2:11 pm 
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Location: San Francisco, CA
I'm interested in the Praxis 36-46 'cross rings, not for cyclocross but for my road bike.

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Weight? Applicability to road bike? (I post this on the 'cross forum since cyclocrossers are more likely to have used them)

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Posted: Sat Apr 13, 2013 2:11 pm 


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PostPosted: Sat Apr 20, 2013 10:30 am 
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Joined: Mon Sep 10, 2012 2:37 pm
Posts: 75
Review of 48/36 set.

http://www.bikerumor.com/2011/12/05/praxis-works-chainring-review/

As you can see, there is a picture of the weight for the 48/36 combo (134g). 46/36 is probably about 10g lighter at a guess. I haven't found someone who has weighed them, but I haven't searched for a few months now as light bike is on back burner for now. I was going to run these rings on a red crankset, but the new 11 speed red cranksets actually are coming out with a 46/36 option :) And yep, I run this as my road combo. I find it is awesome for anyone who likes to spin gears instead of grind them. Combine them with a 11-23, and I reckon it's a perfect set of race gears as the jump from 46 to 36 requires only 1 additional downclick on the rear, effectively giving a smoother transition to 'the next gear' without a huge jump in rpm.

These are the notes off their website (with my additional info in brackets)

- Will mount to most any traditional 5-arm 110BCD road crank.
- Not compatible with Campy Compact BCD with hidden mount (not sure on this one, I think campy compact has one bolt at a different bcd?)
- Not marketed for '12 SRAM RED with hidden mount (but can be used if you can handle the chain pin being offset from the crank. i.e. your probably best to cut the pin off, example usage http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=113632&hilit=red+crankset+weight )
- CHAIN - 9/10 & 11Sp Campy & Shimano

Cheers,
metal


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PostPosted: Sat Apr 20, 2013 10:33 am 
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Oh yeah, if you do buy these, can you post up the weight for them to this thread.

Thanks,
metal


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PostPosted: Sun Jun 30, 2013 8:19 pm 
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Location: San Francisco, CA
Purchased from Roll in San Francisco:

46T ring: 104.0 grams
36T ring: 35.4 grams
total: 139.4 grams

Disappointing. I posted to listings. They do look good, however.

The 46T ring is quite solid. There's definitely some drilling opportunity, if I had a set-up to do that.

I'll see how they shift.

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PostPosted: Sun Jul 21, 2013 4:24 pm 
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Location: Maryland
DJ, any thoughts on the shifting? I'm trying to decide between the faithful single ring and these as the double option. Worth the money over FSA eBay special?


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PostPosted: Thu Jul 25, 2013 4:47 am 
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I've been injured so haven't installed them yet. Actually, I've been contemplating drilling it for fun to see if I can get the weight down a bit, but don't have a drill myself, so would need to find a place to do that.

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PostPosted: Sun Jul 28, 2013 2:38 pm 
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Location: Maryland
Gotcha... Good luck healing up. And with the drilling.


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PostPosted: Wed Jul 31, 2013 8:35 pm 
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JN2 -- Best shifting rings I've ever had! Well worth the money.


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PostPosted: Tue Aug 06, 2013 3:53 pm 
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Location: Pedal Square
Pondering those for my "alpine gravel" rig, but a 34-46 option would be preferred. Double digit inclines are the norm, and 2x% sections not unheard of on the lumber roads -- they are built for 4wd and forestry machines only.

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Bikes: Raw Ti, 650b flatbar CX


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PostPosted: Tue Aug 06, 2013 6:17 pm 
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Location: Maryland
Honestly, for the gravel grinding I've done, a standard compact (50-34) with a 28-32 tooth (largest your derr can handle) cassette is a good setup. You actually may need a 50 to avoid spinning out the 12 on descents, and the 50-34 rings are made for good shift timing, whereas 34-46 isn't optimized to be used together. Would probably still work fine, but may as well use the 50-34, in my experience.


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PostPosted: Wed Aug 07, 2013 10:21 am 
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Location: Pedal Square
Yeah it doesn't matter a lot, running 50/34 with 12-30 now. On the "new" (collection of used parts) build I have an 11-34 cassette lined up, which the long-cage Ultegra RD handles. The smaller "big" ring would give a better chainline when cruising around at lower speeds. On the gravel rides I'm not concerned about spinning out really, it's more about going where you only see MTBs :D

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PostPosted: Thu Aug 08, 2013 3:36 pm 
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Just to update. Went ahead and picked up the aforepondered FSA ebay special ($32 vs $170). Very little use, and weigh 126g. Appear pretty beefy. I'll let you guys know how they shift, but these close ratio setups must be some of the easiest shifting scenarios out there.


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Posted: Thu Aug 08, 2013 3:36 pm 


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PostPosted: Thu Aug 22, 2013 7:50 pm 
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Location: San Francisco, CA
Well, I'm riding again, but not on my racing bike, so haven't used the Praxis rings yet.

Here's the mass numbers from Fairwheel, the 36-46 excluded:

Praxis Chainring Specifications
Material forged 7075 T6 aluminum
Compatibility 9/10/11 speed
Weight
Classic, 130BCD 53/39 128 grams
Clover, 110BCD 48/36 127 grams
Clover, 110BCD 50/34 124 grams
Clover, 110BCD 50/34 DA + Bolts 153 grams
Clover, 110BCD 50/36 128 grams
Clover, 130BCD 53/39 119 grams

So I'm not happy about my 139. I haven't checked out any machine shops, yet.

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