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 Post subject: Re: Oval chainrings
PostPosted: Fri Mar 20, 2015 9:38 pm 
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timid kitty
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Joined: Tue Feb 24, 2015 11:01 pm
Posts: 37
Location: San Diego
Got it mounted up and took it for a short spin. I did a quick 3-mile route around the neighborhood and into Balboa Park, with a few short, steep hills thrown in. First I rode the route with the old 32t round chainring, then came home and swapped in the new oval ring and went out and re-rode the exact course again. Trying to get a before-and-after experience and eliminate too many variables. I can truly say this thing rocks!!

It felt kinda weird for about a half-block, and then it felt completely natural for the rest of the ride. Standing up and mashing on the pedals to get up a steep-assed hill was awesome - I kept it in a higher gear than I normally would but never felt like I was going to stall out. It was like... I'd mash down with my right foot, and at the end of its downstroke, almost instantly my left foot had zoomed around to the top of its power stroke. On one steep hill (on a loose gravel trail) I stalled and stopped because of a mis-shift (nothing to do with the new ring). But getting started again seemed a lot easier than usual.

Here are some pics of the installation in progress and a short video showing it in action:
(and you might notice that I ditched the bashwich and the C-guide, so relying on the narrow-wide chainring and the clutch derailleur to keep the chain where it's supposed to be)

Before:
Image

Before, up close:
Image

Old chainring removed:
Image

Tools ready to go:
Image

Sliding the new ring over the crank arm (didn't have to pull the cranks!):
Image

The new ring bolted in:
Image

Note the alignment tab, located behind the crank arm:
Image

After - crank is in position for the maximum radius of the oval in the "pulling" position:
Image

After - with the crank in position for the minimum radius in the "pulling" position:
Image

All done and ready to roll!
Image

Here it is in action:



Hi-res images HERE.


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 Post subject: Re: Oval chainrings
PostPosted: Sun Mar 22, 2015 12:47 am 
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friendly kitty

Joined: Wed Nov 13, 2013 11:38 pm
Posts: 313
Location: Indiana
I plan to put mine on tomorrow after my ride. I hope my knee likes it.


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 Post subject: Re: Oval chainrings
PostPosted: Sun Mar 22, 2015 4:47 pm 
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yappin' kitty
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Joined: Mon Feb 25, 2013 9:05 pm
Posts: 957
Location: Dallas, TX
Should have mine finished today.

Attachment:
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 Post subject: Re: Oval chainrings
PostPosted: Sun Mar 22, 2015 10:56 pm 
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yappin' kitty
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Joined: Mon Feb 25, 2013 9:05 pm
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Location: Dallas, TX
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 Post subject: Re: Oval chainrings
PostPosted: Mon Mar 23, 2015 1:00 am 
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friendly kitty
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Joined: Sat Feb 02, 2013 10:27 pm
Posts: 464
Location: NoVA
^ As a SS are there noticeable tight / loose spots?


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 Post subject: Re: Oval chainrings
PostPosted: Mon Mar 23, 2015 1:48 am 
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yappin' kitty
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Joined: Mon Feb 25, 2013 9:05 pm
Posts: 957
Location: Dallas, TX
Yes, but it doesn't cause too much difference one way or the other. Just ensure that when tightening the chain you get it right in the sweet spot.


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 Post subject: Re: Oval chainrings
PostPosted: Mon Aug 03, 2015 9:03 pm 
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friendly kitty
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Joined: Tue Jul 22, 2014 10:27 pm
Posts: 114
How is everyone liking their ovals?


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 Post subject: Re: Oval chainrings
PostPosted: Wed Aug 05, 2015 2:51 am 
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friendly kitty

Joined: Sat Oct 19, 2013 9:27 am
Posts: 286
spinnorama wrote:
How is everyone liking their ovals?

I have a Rotor Q-Ring in a 36t/11-34 config which I really like, combine it with the legendary efficency of Maverick's MonoLink suspension it just accelerates very linearly, like the ECVT gearbox in a Subaru Justy ECVT.


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 Post subject: Re: Oval chainrings
PostPosted: Thu Aug 06, 2015 8:04 pm 
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friendly kitty
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Joined: Sat Feb 02, 2013 10:27 pm
Posts: 464
Location: NoVA
Sarge wrote:
spinnorama wrote:
How is everyone liking their ovals?

I have a Rotor Q-Ring in a 36t/11-34 config which I really like, combine it with the legendary efficency of Maverick's MonoLink suspension it just accelerates very linearly, like the ECVT gearbox in a Subaru Justy ECVT.


No input on ovals, but thanks for today's chuckle..
Never could I envision a positive sentence with Subaru Justy and acceleration.
:lol:


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 Post subject: Re: Oval chainrings
PostPosted: Fri Aug 07, 2015 1:48 am 
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friendly kitty

Joined: Wed Nov 13, 2013 11:38 pm
Posts: 313
Location: Indiana
spinnorama wrote:
How is everyone liking their ovals?


I like mine. Only noticed it on the first test ride around the block.
I went from a 30t round to a 32t oval. I can't say that it noticeably makes climbing easier, but it seems to have eased the post ride knee pain just a bit. Speed on the flats is up just a bit.

In the 18 months I ran the 30t NW ring I only dropped a 9 speed chain twice. Both times were ratcheting backward in a rough section of trail. The 10 speed chain fits snug on the new 'ring, so I wonder if I will ever have it drop.


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 Post subject: Re: Oval chainrings
PostPosted: Sat Aug 08, 2015 10:02 pm 
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yappin' kitty
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Joined: Sun Mar 10, 2013 12:27 am
Posts: 682
Location: Dallas, TX
spinnorama wrote:
How is everyone liking their ovals?


Loving my Absolute Black baby.
I went from running 30/18 everywhere around here to switching to an oval 30/17 with no apparent change in effort. Plus, my top end speed is quicker.
I've recently changed to 30/16, and it's going quite well.

I'm not sure I'll go back to my round chainring again, especially since Wolftooth makes them now, too.

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 Post subject: Re: Oval chainrings
PostPosted: Sun Aug 09, 2015 4:10 pm 
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friendly kitty

Joined: Sat Oct 19, 2013 9:27 am
Posts: 286
Flyin_W wrote:
Sarge wrote:
spinnorama wrote:
How is everyone liking their ovals?

I have a Rotor Q-Ring in a 36t/11-34 config which I really like, combine it with the legendary efficency of Maverick's MonoLink suspension it just accelerates very linearly, like the ECVT gearbox in a Subaru Justy ECVT.


No input on ovals, but thanks for today's chuckle..
Never could I envision a positive sentence with Subaru Justy and acceleration.
:lol:

The ECVT is a nice gearbox, but reliablilty is bad according to a few Subaru mechanics on the Justy Forum.


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 Post subject: Re: Oval chainrings
PostPosted: Mon Aug 10, 2015 4:40 pm 
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yappin' kitty
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Joined: Mon Feb 25, 2013 9:05 pm
Posts: 957
Location: Dallas, TX
I really like my AB oval. It's so pretty I'm not sure if it performs better though.


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 Post subject: Re: Oval chainrings
PostPosted: Mon Aug 10, 2015 4:52 pm 
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friendly kitty
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Joined: Sat Feb 02, 2013 10:27 pm
Posts: 464
Location: NoVA
Back in their day, I used to see Justy's claw their way up Parley's Canyon (SLC) unable to hold speed or a gear.

So, to read a sentence about the acceleration of a 3-cyl. car had me LOL and gack coffee all over my keyboard. :)


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 Post subject: Re: Oval chainrings
PostPosted: Fri Sep 18, 2015 3:55 pm 
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friendly kitty
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Joined: Sat Feb 02, 2013 10:27 pm
Posts: 464
Location: NoVA
Paul_C wrote:
I really like my AB oval. It's so pretty I'm not sure if it performs better though.


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After riding it for a month.. what are your thoughts?


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 Post subject: Re: Oval chainrings
PostPosted: Mon Nov 02, 2015 12:56 am 
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friendly kitty

Joined: Wed Nov 13, 2013 11:38 pm
Posts: 313
Location: Indiana
I like my AB oval chain ring, but I'm not the "brand ambassador" type.

For those who are http://www.absoluteblack.cc/ambassador-program/


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