Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

What BCD are the Praxis cranks? I think the minimum chainring you can fit to a 110 BCD crankset like the Dzero is 34, so it’s unlikely they’ll fit.

I might be wrong though.

For this five-bolt crank and its 110mm spider Praxis has come up with a clever fourth way: dispense with the chainring nut and screw the bolt straight into the inner ring. That provides the necessary couple of millimetres of extra space needed for a 32-tooth ring.

I don’t think there is a crank based option, unless somethinf new has come. I wanted to run 30t on the front but couldn’t find something that’d worth with reliable PM.

Let me know if you find it. Maybe best to go Garmin pedals and do the SPD ultegra pedal switch. Speedplay are no better. Plus can swap between bikes easy then too.

I wonder if the Easton Cinch with their gravel chainrings would do the trick.

They can do 47/32 , 46/36 , and 46/30 .

Not cheap though.

Power2max are having a sale;

https://www.power2max.com/en/power-meter-offers/

Hello Power Peeps,

Have the following that are not getting used.

• Power2Max Type S Power Meter Rotor 3D+ Crankset 170mm 110BCD 325 GBP (I also have the original spider for the cranks)
  
• SRM PC8 (Grey) with Cable and pouch 290 GBP
  
  

Meal Deal! both for 595 GBP
Plus Shipping from France

DM if you would like images / are keen, will most likely post in classifieds this weekend.

Thank you

Update on my Power2Max classic.

Sent it back to Power2Max after doing a static torque test and finding it was out by about 6% (low)
They tested it and found the same and also the cause of the issue - it had been slightly damaged some how.

Was offered a replacement NGeco or Type S for 290EUR or NG for 495EUR. They also said that they could send me back the classic, recalibrated and I could send it back to them at any point for the replacement, but that they couldn't guarantee that it wouldn't have the same problem again.

They were happy to replace the spider with any type - it didn't have to be the same rotor 3d+ as I sent them, which was useful to know.

Considering my unit was at least 2 years out of warranty, I thought that was pretty decent and opted for a replacement NGeco which arrived yesterday.

Installed it and it appears to be spot on - very slightly higher readings than my Tacx Neo, which you would expect given drive train losses.

The NGeco app allows you to disable auto-zero and also manually set the slope. There are upgrades available for l/r power balance, smoothness and torque - non of which I am interested in.
No fiddly o-rings or tools needed to replace the battery either, which is the same CR2450 which I have stock-piled.

Question for anyone using Garmin Vector 3 pedals. What sort of range of figures do you get when doing a zero offset?

I'm using either the wahoo or Trainerroad app to do a zero offset before rides (Karoo doesn't do calibration yet). Sometimes, I get a large offset value of between -80 and -180 (from memory). If I then re do the calibration straight away it's consistently +- 3 or less

Is this normal or does it mean my pedals are drifting out of calibration over time? It has been the same with auto zero enabled and disabled.

Quarq Dzero Allu crank
Or
p2m NGeco spider on my Force crank

Same price. Sense both options are win win and I'm just talking out aloud.

P2M. DZero Ali works well but it's one seriously chunky monkey.

Any meters let me run smaller than 34T?
No Stages, no Vectors.

no

Powertap P1. Not Vectors.

Favero. heh

Mtb

No copies either

Ferrerro ?

Such as?

https://www.power2max.com/en/power-meter-ngeco-mtb/ ?

https://www.power2max.com/en/product/ng-mtb-fsa-afterburner-set/

p2m? don't know the ins and outs of mtb cranks on road bikes (if any).

The ROTOR MTB chainring set for bolt circle diameter 110/60 is
available in 36/22, 38/24, 39/26 and 40/27

46 / 30?

What's the biggest FD gap? 14T normally. Can it be exceeded without fucking things up?

Boost Vs standard chainline? What are they compared to road?
Looks like there's SRAM and RaceFace options - their FSA don't come in 165mm.

What's the biggest FD gap?

Road FDs are mostly 16T max (e.g. 50/34), although using smaller rings might reduce that slightly.

The problems start when you go much below the normal outer ring size, such as poor shifting and eventually crashing the tail of the cage into the chainstay.

Boost Vs standard chainline? What are they compared to road?

Standard is wider than road, Boost is wider still

Very brittle material.