ZAYANTE 172.5 50/34 — Praxis Works

Alternative crank for Ultegra groupset

Are you looking for 52/36 or 50/34?

You may be surprised how competitive a FC-5750 can be with a BB-9000. Compared to FC-6800 50/34, there’s a ~45g difference (721g vs 667g) With a BB-9000 unit, you save ~12g over a BBR60, alloy chainring bolts save ~15g, and you can save another ~3g with titanium pinch bolts, bringing it to down to a ~15g difference, well under the cost of a FC-6800. I believe this combination is considerably lighter than either the Zayante or the Situs as well.

You’re looking at $100 for the crank, $30 for the BB (not included with FC-6800 anyways), $5-10 for the CR bolts, less than $5 for the pinch bolts plus cost of whatever chainrings you want.

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In terms of gearing, I would like to run both 34 and 39, both in combination with 50. 50/39 is apparently sometimes a problem with 11 sp Shimano cranks.

Spraying a Rotor crank is also a good option.

Most «innovations» in cycling are solutions for non-existing problems.

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I am changing the groupset on my Ultimate CF Disc to an Ultragra Di2 Upgrade kit. At the moment I am running a Quarq DZero Carbon crankset (which uses symmetrical 5 bolt chainrings).

My options?

1)Should I swap to a Quarq DFour91 spider with Shimano Ultegra chainrings?

2)Are there any chainrings that would be close in shifting performance to the Ultegra chainrings that have a 5 bolt interface?
What about chainline?

3) Ditch the Quarq and go for a Ultegra Stages LR powermeter crankset?

What would you do?

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Hi guys,

I currently own a Power2Max Type S mounted to Rotor 3D cranks and Praxis works rings. Having just purchased a used Cervelo S5, which came with a Rotor Inpower crankarm, I’m just trying to work out what the best option’s are for me:

My winter bike is a Trek Domane with BB86, which I currently run the p2m on.
My Summer/race bike is the Cervelo S5, with a BBright bottom bracket for 30mm axle’s.
I also work abroad most of the year and run a fleet of Trek/Boardman bikes, all of which have press fit BB’s for 24mm Shimano axle’s

Ultimately I’d like to sell the RotorInPower and use/purchase a true left/right PM such as my current Power2max. What would be the best option here… Change the bottom bracket in the Cervelo to a 24mm spindle converter? I’ve heard BBinfinite are quite good here, but can’t justify spending over £100 on a BB, any slightly cheaper alternatives? This seems like the cheapest route as I’d just keep one powermeter and change between bikes. Any discernable difference between 30mm and 24mm axles?

Any one have experience with the RotorInpower? Any less accurate than P2M spiders? I love my praxis works rings for sublime shifting but q-ring compatibility has peaked my interested in this and may be something i look at in the future. Is it worth just keeping this?

Lots of questions, just trying to work it all out. Thanks for the help!

§

Hi guys,

I currently own a Power2Max Type S mounted to Rotor 3D cranks and Praxis works rings. Having just purchased a used Cervelo S5, which came with a Rotor Inpower crankarm, I’m just trying to work out what the best option’s are for me:

My winter bike is a Trek Domane with BB86, which I currently run the p2m on.
My Summer/race bike is the Cervelo S5, with a BBright bottom bracket for 30mm axle’s.
I also work abroad most of the year and run a fleet of Trek/Boardman bikes, all of which have press fit BB’s for 24mm Shimano axle’s

Ultimately I’d like to sell the RotorInPower and use/purchase a true left/right PM such as my current Power2max. What would be the best option here… Change the bottom bracket in the Cervelo to a 24mm spindle converter? I’ve heard BBinfinite are quite good here, but can’t justify spending over £100 on a BB, any slightly cheaper alternatives? This seems like the cheapest route as I’d just keep one powermeter and change between bikes. Any discernable difference between 30mm and 24mm axles?

Any one have experience with the RotorInpower? Any less accurate than P2M spiders? I love my praxis works rings for sublime shifting but q-ring compatibility has peaked my interested in this and may be something i look at in the future. Is it worth just keeping this?

Lots of questions, just trying to work it all out. Thanks for the help!

§

Hi guys,

I currently own a Power2Max Type S mounted to Rotor 3D cranks and Praxis works rings. Having just purchased a used Cervelo S5, which came with a Rotor Inpower crankarm, I’m just trying to work out what the best option’s are for me:

My winter bike is a Trek Domane with BB86, which I currently run the p2m on.
My Summer/race bike is the Cervelo S5, with a BBright bottom bracket for 30mm axle’s.
I also work abroad most of the year and run a fleet of Trek/Boardman bikes, all of which have press fit BB’s for 24mm Shimano axle’s

Ultimately I’d like to sell the RotorInPower and use/purchase a true left/right PM such as my current Power2max. What would be the best option here… Change the bottom bracket in the Cervelo to a 24mm spindle converter? I’ve heard BBinfinite are quite good here, but can’t justify spending over £100 on a BB, any slightly cheaper alternatives? This seems like the cheapest route as I’d just keep one powermeter and change between bikes. Any discernable difference between 30mm and 24mm axles?

Any one have experience with the RotorInpower? Any less accurate than P2M spiders? I love my praxis works rings for sublime shifting but q-ring compatibility has peaked my interested in this and may be something i look at in the future. Is it worth just keeping this?

Lots of questions, just trying to work it all out. Thanks for the help!

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