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

As long as that number is fairly consistent whenever you calibrate (i.e. Start of every ride) then you're good. I believe that you should expect to find a fluctuation in this number between changes in temperature.

Ive also just received a Quarq DZero. What aero-ish (130bcd) chainrings are compatible with the battery cover location?

I think your problem is that you already have a strain guage PM so you won’t be able to do meaningful comparisons between the data from two.

Also trackies aren’t mad about having stuff attached to bikes on their tracks, right?

This is the problem.. you're allowed stuff mounted on the seatpost though. I think powerpod could work that way. I don't know the options for track bike crank power. I suppose the other option is Garmin vector but I like SPD-SL.

I just sold my powertap track wheel :(

Cheers, no idea on the chain rings though

Damn.

@Cazakstan I think powertap/garmin pedals might be your easiest option if you're wanting to switch between track and other (road?) bikes as it's likely your crank arms on the track bike will be shorter than your other bikes, meaning a cheap 4iiii/stages wouldn't work.

Could always go single-sided pedals and upgrade to dual-sided when budget allows? Unfortunately the powertap cleats are £20+ 😐

Actually, do powertap/garmin pedals increase possible pedal strike?...

I think @laner might have a powertap track wheel

I'd lend you mine if I wasn't away

A Powerpod has to be mounted on the front of the bike - it's effectively a wind sensor that back calculates power rather than measuring it directly with a strain gauge. I'd find something else TBH

Aero for TTs? We do a 54t and 58t 1x carbon chainring that can be cut to fit (by us)

@laner Let's chat when you're back..

Thanks everyone else. Garmin vectors are out due to pedal strike risk in fixed crits.

Powerpod on handlebars probably isn't allowed on track.

Powertap hub is probably the best option.

You'd strike the pedal before the pod.

Powertap track hub is my favoured option for track and for fixed gear bikes. I have six of them. The only downside is that if you try to back-pedal too hard, or skid, the internals start unwinding themselves, which is bad. If you can avoid that, they're brilliant. But the 'no back-pedalling/resisting forward motion too hard' thing might make them unviable for fixed crits. In which case, you're back to a spider or crank arm based option.

the internals start unwinding

It's a bit of an oversight to make a "fixed" hub which isn't actually fixed, but that's what you get when you lash something together from a road hub which is already fundamentally flawed :)

And the new version doesn't have pods. And I think you can change the body for an SPD-SL.

http://road.cc/content/tech-news/185198-updated-garmin-vector-power-meter-now-compatible-shimano-pedals

Hmm, I've never actually skidded in a fixed crit so maybe the powertap hub could work.

I think Garmin vectors with ultegra pedal swap would be good too. I'll have to see if this means the pedals are deeper, more investigation needed!

You can change the body of the Vector 2s for an Ultegra body. You can with the 3s. I've got a pair of the Vector 2s in Ultegra bodies fitted using the Garmin adaptor bits. Apart from the pods (which aren't really that vulnerable, and are relatively cheap to replace) they're exactly the same dimensions as a standard Ultegra pedal.

Hmm, I've never actually skidded in a fixed crit so maybe the powertap hub could work.

It's not just skidding though. I once gave a decent amount of resistance through the pedals of my track bike because I wanted to make sure I made the ramp at the velodrome, and the rear hub started to unwind itself. Not a nice feeling. So slowing down vigorously is enough, and I'm assuming in a fixed crit you may need to slam on the anchors occasionally.

Yep, good point well made. Pedal body swap might be the best way.

for power on a track bike you really need a SRM or Stages and deal with the 1 sided-ness.

So Garmin pedals are a no even if they are the same as normal ultegra pedals? Surely that's the best option?

They're good but if you plan on swapping them it's not a 2 minute job as you need to get the torque just right, likewise you'll need a big torque wrench. I guess a 1 sided Vector and a Stages cost about the same. Also I don't really know calibration consistency if you chance the Vectors between bikes.

Hmm, more things to consider. Why is it so complicated?! Haha.