Crank powermeter for a fat bike, (single chain ring)

[cetuximab]

I want to build a full susp fat bike.

The frame I am looking at requires 120mm BSA crank.

Never had a powermeter. I just downloaded training with a powermeter.

The powertap is only available with a 160mm rotor, so I decided against their hub powermeter.

So, thinking about a crank located powermeter. I like my single chain ring bikes. I have 1x10 and a 1x11 that work flawlessly.

Any recomendation?

Thanks

[loxx0050]

Pedal based? Powertap P1 or Garmin Vector...there is another I believe but the name escapes me at the moment. Both offer single sided versions if you are on a budget.

[djg21]

Originally Posted by loxx0050

Pedal based? Powertap P1 or Garmin Vector...there is another I believe but the name escapes me at the moment. Both offer single sided versions if you are on a budget.

On a fat bike? To be ridden on trails? I don’t think anyone makes a pedal-based power meter for an MTB. There are some crank options, but they are expensive. If you get a Powertap G3 hub, can’t you switch the rotor?

https://powermetercity.com/2016/12/3...-power-meters/

https://shop.brake-stuff.de/en/power...rtap-hubs.html

[zank]

I think your only option is the Stages Carbon GXP for MTB arm. Stages doesn't make a long enough spindle for their BB30 SRAM mtb arm.

[thegunner]

Originally Posted by zank

I think your only option is the Stages Carbon GXP for MTB arm. Stages doesn't make a long enough spindle for their BB30 SRAM mtb arm.

or just get a quarq and run a single chainring.

[zank]

How though with a 120 mm BB shell?

[shovelhd]

What's wrong with a 160mm rotor? You can't change the bracket?

[zank]

Can a PT be fitted to a 177 or 197 rear end of a fat bike?

[SkyRider]

Stages is a strong option but they do have a number of transmission issues. Depending on your timeline Raceface will have a cinch spindle power meter for fat bike soon and it can be paired with any of their arms and and cinch direct mount chainrings. Quarq could be an option but it’s not a stock setup. You would need to order the power spider separate from the direct mount crank and install it. That will put a limit on the smallest chainring you can run. Stay away from pedal based power as a rule (as far as I know they are road only still but this is a general statement). They are heavy, have a tall stack height and are unreliable generally suffering from very specific install requirements that can wildly alter the reading accuracy.


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[SkyRider]

Originally Posted by zank

Can a PT be fitted to a 177 or 197 rear end of a fat bike?

To my knowledge PowerTap doesn’t make a 177 or 197 hub and their hub would not be adaptable to those standards.


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[SkyRider]

Question for the OP. What frame are you using? A bit more information on the frame and therefore the standards involved might help to get you a better answer.


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[cetuximab]

Originally Posted by shovelhd

What's wrong with a 160mm rotor? You can't change the bracket?

The bike comes with a 160 mm rotor bracket.

I weight 205. The last few bikes I built had 205 front and 180mm rear disc rotors. This full susp fat bike is to ride in our local trails. (many are quite steep and tech). And the occasional trip to moab.

[cetuximab]

Originally Posted by SkyRider

Question for the OP. What frame are you using? A bit more information on the frame and therefore the standards involved might help to get you a better answer.

Generic Chinese Carbon Frame

It will fit 4.6 wide tires.

[chiasticon]

I'd like to hear more about your experience with using the power meter on the fat bike, once you get one. to me, it wouldn't be an ideal situation to train specific zones and weaknesses. but I think a lot of that depends on what sort of terrain you're riding as well. for example: snowy, technical singletrack versus beautifully-groomed cross-country ski trails.

[Mzilliox]

The Easton/Race Face Cinch system has a spindle based PM. I just picked one up for an Easton Road and gravel crank, but have not used it at all yet.