Using crankset with ANT+ powermeter as PAS

[Boredwithpetrol]

Hello everyone, first post here. I'm halfway through my first build and I've made it as far as I can without taping into the wealth of knowledge that is Endless-spere. Lets get to the heart of the issue:

My goal is to setup a cyclocross frame as a single speed with PAS, a rear hub motor, and hydraulic disc brakes. I consider the concept to be an all out assault on urban commuting. The cyclocross frame I've purchased has a PF30 bottom bracket, and I intend to use an eccentric bottom bracket (ebb) to accomplish the single speed setup. See link for info on PF30 ebb:

http://beercomponents.com/?page_id=588

I originally planned to run the ebb with a THUN X-CELL RT to accomplish the ebb/PAS configuration. This has proven difficult due to compatibility issues with the THUN and anything I can find on the market for a PF30 ebb.

A very expensive, but potential solution, is to use a crankset with an ANT+ compatible powermeter serving as the PAS. See link for powermeter being considered:

http://www.srm.de/product/powermeters/k-force-bb386-standard/

This is where my question comes into play. Has anyone experimented with ANT+? I'm curious if the ANT+ powermeter will work as a PAS, and how the ANT+ powermeter would communicate with the controller/Cycle Analyst V3.

Any ideas? If anyone has a simpler approach, I'm all ears.

 

[Animalector]

Sorry to dig this up.. but I've been thinking about this.. There are many new power meters on the market, I saw one the other day discounted to around $200AUD. which would make an awesome Torque based throttle.

Before i get into it, has anyone got any ideas like this, or reasons why it wouldn't work...

Refresh rate is one factor to consider...

Andy

 

[PaulD]

Sorry to dig this up.. but I've been thinking about this.. There are many new power meters on the market, I saw one the other day discounted to around $200AUD. which would make an awesome Torque based throttle.

Before i get into it, has anyone got any ideas like this, or reasons why it wouldn't work...

Refresh rate is one factor to consider...

Andy

I've thought about this a bit, since it would really open up the ability to convert more frames with different BB standards, and allow a modern (not square taper) crank. The cost was a big one, but as you noted, that is changing. Is there someone with the time and skill to make an ANT + receiver that converts the signal to a 0-5v throttle signal?
Agreed that we would need to confirm fast enough sample rate and response.

 

[ScooterMan101]

I as well would like to see a inexpensive ANT + PAS system .That would work with the newer style of cranksets , ie: BB30/PF30
Shimano Hollowtec II , etc.
( Torque Sensing does not work for me since I have arthritis/inflammation
in my knees so can not put much power at all on the cranks )


In the meantime , until such a product is made ... a simple approach is to just use a throttle .
I use my Throttle as a PAS, I throttle up to the speed I want, then shift to the right gear to get to the cadence that will be easy on my knees and cardiovascular system. Easy , very easy and effective .

For making your bike a single speed no need to , just take off or not use the second chainring and front deraulleur on the bike, when e-biking you most often just need one chainring on the front. Look at all the newer E-Bikes from the Good Quality Bike Mgf's, they use 1x systems , these days 1x 10 or 1x11 and now 1x 12 .
If you are set on doing a single speed, why not just just use a chain tensioner ? Or the rear derailleur as the chain tensioner .

Any ideas? If anyone has a simpler approach, I'm all ears.

 

[Animalector]

My first thought was a bolt on load cell. With a Bluetooth link to a DAC for 0to5v output. But really you also need to know rotation. Torque alone doesnt cut it.

What if you're standing on the pedals? Of course you could put a sensor on both crank arms but twice the cost and complexity.

Maybe it's better to build a torque sensing chain ring with standard bolt pattern. Problem there is ebike chain rings are usually pretty tight for space especially if you're using a primary reduction

Hmm...
Andy