[Closed] Elliptical single speed chainrings

first thing I'm gonna do when I get one is try it out with a powertap 🙂

I'd be interested to see the results.

I can't see how getting your foot through the dead spot faster has any advantage other than psychological.

I'd figure that it's more like the difference between riding your normal gearing and a monster gear (let's say 5 times higher than normal). In the monster gear, you'd theoretically use the same energy/power but since you can't actually push it round with five times the force, even if you can reduce your cadence to match, you actually go slower.

i'd like to know more, any linkys?

can't see how getting your foot through the dead spot faster has any advantage other than psychological.

It may well be just that. According to Rotor (who would be positive about it, but it makes sense from my exp of using the 34 oval and 32 rounds on and off), it's that speed through the dead spot plus the resulting 'leg momentum' toward the mid/end of the downstroke that counts. So you get a good 'run up' at the power stroke around 4 to 5 oclock position, when the ring is at its largest radius - ie you can turn a slightly larger equivalent for the 1/6th or so of the revolution where it counts, and rest-easy elsewhere. The 1:6 effort:rest ratio per leg of pedalling a bike has been looked into and shown to be pretty effective, although I forget where I read that now.

I guess you'd need to look at av speed on steady climb vs HR to say for sure, I just tried them and liked them )

[url= http://www.rotorbikeusa.com/images/science/pdf/qring_test_summary.pdf ]science testing bit for elliptical rings just for AL[/url]

Where's the executive summary and will it make women fall at my feet?

I picked a 35t up at the weekend from kev to go on my 1 x 9 carbon 456, just waiting for the bloomin frame to arrive...

Out of you guys who've now got them, how many of you have tried them??

Thoughts in use??

Lovin mine. Set up ss 35tx20, hoping to try it out in 1x9 mode also before hopefully buying another one. Does seem to smooth/even out the pedal effort and cadence on the ups and downs.

I've been using them for a while,quite like it.of course I'll never be a riding god like Taz(so he tells me) but it feels beterer to me,so I'm a happy bunny.

noticed Brad Wiggins was using wonky chainrings today... in the Tour de Normandy

😆

Any news on direct mount Middelburn rings? I need a new Uno and fancy giving a wonky ring a go.

Cheers, Rich

"Leg momentum"...I find if I don't push my legs round really hard, the bike stops...

Interesting test tho...3% gains...why aren't all the pros using them I wonder.

Christoph Sauser
Ned overend
the niner ergon team
cervelo team
etc..
nope no pros there using elliptical rings 😀

Oh and if anyone wants a go on one I'll be racing on an elliptical ring (single speed) at E6 next week some come and have a play on it after the event

2 individuals and 2 teams and "etc"...

...so are they winning everything?

no Al 'cos it's snake oil obviously 🙄

*gives up with "big hitter" and goes back to having fun*

What's 'big hitter'?

If those pros did win everything they wouldn't say it was down to the rings. That'd be daft )

oh dear, wonky rings didn't do Wiggo any favours today...

Yes, saw that too. Although it may have been that he changed from a really big ring to a really small one ?

Wiggo doesn't have a beard though

I'm just trying to see what evidence there is tazzy, you'd think there'd be more than that (biased, imo) one test if there really was a 3% benefit.

anybody using the elliptical\q-ring on a singlespeed and flat pedals? would they work?

no, the flat pedals would cancel the elliptical concentricity and sinusoidal frequency resonance of the system as a whole making a small tear in 3d space leading to annihilation of earth and most of the big hitters.

(of course it'll work 😉 )

I meant work as in equally effective but I caught your drift 😉

Since we are at it, I currently run a 34x18, should I get the 34 or the 33t elliptical ring?

Kev (and another lad) said that you can go 2 teeth up on what you normally would run, due to the "benefit".
I was going to run a 34, which I thought would be pushing it originally, but I bought and use a 35t.
This is on a 1 x 9 btw, 11 - 34 cassette and it's going pretty good on all bar really long climbs.

[url= http://farm9.staticflickr.com/8009/7242345464_b8e3da221f_z.jp g" target="_blank">http://farm9.staticflickr.com/8009/7242345464_b8e3da221f_z.jp g"/> [/img][/url]
[url= http://www.flickr.com/photos/47638700@N06/7242345464/ ]Untitled[/url] by [url= http://www.flickr.com/people/47638700@N06/ ]jerrypc69[/url], on Flickr

.
Also in ...Uno flavour .......

As old as the hills. Shimano biopace from around 1990.
Waste of time IMO.

tomstickland - Member
As old as the hills. Shimano biopace from around 1990.
Waste of time IMO.

[img] ?w=360&h=450[/img]

Tom, after extensive research it's been found the Biopace was flawed and wrong - Shimano got it wrong. These rings are way way different and do actually work and there's been nothing but praise for them. There's been loads of work done on the actual ellipse too and the paperwork to prove it is quite exhaustive.

Good
I used bio-pace first time around and loved it .

*shrugs* ......I still liked Bio-pace

Is the black coating on these rings normal anodising, or something harder that will help prevent the rings wearing as quickly?

is this the STW version of Mornington Crescent or genuine? If the latter, should I assume a tensioner is required?

Why would a tensioner be needed ?

no, no tensioner is needed, you just need to know how to set up the chainring correctly with the correct tension at the right point of the "wobble" and low and behold you can mosh the tits off it without it dropping. there are various instructions and guides floating around for set up.

(there is a little bit of variance in the tension but it all works fine in practice) the only time I had an issue was using an elliptical with a cheapo cog on the back with small flexy teeth. Chucked a surly on the back on been fine for 2 years of hard smashin on my race ss.

[img] ?psid=1[/img]

a wibbly ring and no fugly tensioner in sight 😀

A bit off topic but Tazzy what size rear tyre have you on your Selma ...as I have an Ardent 2.25 and have only got about 2mm clearance ....ok when dusty but the UK don't do dusty much

2.25 rocket ron, even made it though E6 this year which was a bit, erm.....claggy

for full on winter use a beaver, but to be fair the jones comes out to play in the sloppy goppy stuff to keep selma pretty and cannock out of my Fox's

Thanks for the info tazzymtb.

Why would a tensioner be needed ?

Has anyone tried elliptical sprockets?

Has anyone tried elliptical sprockets?

no but I do have one leg shorter than the other after some serious tests and a power sander, I found it was more effective for super cadence.

I do now run around in circles though 😀

I tried elliptical sprockets

they were shit
they were great
they were shit
they were great
...

In the end I decided it was all just hyperbole

geek humour! brilliant 😉

😀

I'm gonna saw the right hand side of my bars shorter as my riding loops are usually clockwise