Are these worth the money for the performance benefits or not? I am gonna be needing new chainrings and these are definetly in my view. Also, what is the bcd for Shimano cranks currently, 130 or 110?

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Never Quit

Shimano makes both 130 and 110mm BCD cranks.

Which for the non-compact dura-ace cranks?

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Never Quit

Q-Rings may or may not work for you depending on your pedal stroke. Apparently it works best for those who push a bigger gear with a lower cadence. I've been running them for a few hundred kilometres so far and I feel less fatigued after rides of the same distance.

The non-compact Dura Ace crank is 130 BCD, but I would advise against using the DA crank with Q-Rings. Visually the DA crank doesn't work too well with anything other than Shimano chainrings.

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Flickr
2012 Cannondale CAAD10

Alright, very helpful. Unfortunately, any other crank arms would be out of budget really since I would just switch the DA from my old bike.
Thanks guys!

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Never Quit

I bought 'em, and figured if they worked, great. If not, I'd put 'em back on Ebay, and go from there.

I bolted 'em up to a set of Force compact cranks, using the standard 50/34 gearing. I run an 11-23 cassette in the rear almost all of the time.

I also live in AZ, so we don't really have any major climbs around the city. I push bigger gears, and lower cadences.

I don't know if the gains were psychological, or not, but these things work! I went up a couple miles of hour on our modest climbs, and found I was dropping my friends on hills I struggled with before. For me they were a "secret weapon", and luckily no one noticed I had put 'em on.

I rode Q rings for about 2 years. My power numbers don't show they helped. They make for bad front shifting b/c sometimes the FD over shifts b/c the chainring isn't tall enough due to its elliptical nature. Kinda hard to explain but if you saw it you'd understand. BTW, if you want my used ones to try them out you can have them cheap. Shimano 53/39. I went back to round rings and my power numbers haven't dropped and my FD shifts well.

Not to be rude, but your account is pure anecdote. I really doubt the rings are making you go a couple miles an hour faster. Ride them for a year. Keep track of your power numbers, climbing speed, then report back. BTW, there are plenty of major climbs near the valley. EOP, Bartlett lake, mining country loop, Mesa to Payson. I won't even bother with all the big mountain bike climbs. PM me if you need to know where to ride near the valley.

Not to be rude,but did you even read my post before you started typing? Look at the part in bold. I said it may just be in my head, that they worked. I did notice a slight gain after installing them. Just because they didn't work for you, doesn't mean they don't work for me.

I adjusted my FD, and they shift fine. Did you try to adjust yours, or just bolt 'em on and hope for the best?

See the part in bold italics, I said around the city, not around the state. I live out in the east valley, so Usery to the beeline is about as big as I have time to do.

PM and I'll tell you where to go, and what to do when you get there.

You don't see many used ones for sale on ebay, so either nobody is buying them or people who use them are keeping them because they find they work.

I bought a set 2 years ago now, liked them instantly.

They don't improve your power, but they do lessen fatigue

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Bike Pure

I used them for two seasons and like them but front shifting was never great despite all my efforts and the efforts of two well respected mechanics. They have updated them a few times as I recall with better shifting the goal so getting the current model would be best. While power meters may not show an increase in wattage IMO they (Q rings) did reduce fatique and my knees felt better. Climbing was smoother too

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WW Velocipedist Gargantuan

I have a Q ring outer and a standard round inner ring. I can really feel the difference - in a positive way.

I'd recommend them.

I put them on my roadbike about a year ago.

Long story short; i'm happy with mine.

According to most of the reviews/stories i've read, I expected I wouldn't be able to shift at all. (sram red front derailleur and q-rings). But it shifts better than anything else i've tried. perhaps it's my method of shifting (orientation of the pedals), i don't know. But i'm pretty keen on the way it worked out.

As for the efficiency of q-rings; they work for me. my heartrate per km dropped. avg heartrate x 60/avg speed.

At an avg speed of 29,7-30,2 km/h on a 60-70km ride;

On my ATB it takes 300 heartbeats per km and on my roadbike this was about 270. With the qrings, i managed to hit 257.

For me, they work. I will use them again when these are worn out.

Nice reply bud. So typical. I won't even bother to respond further.