SRM Wireless problems

MintID said:

Anybody out there with a SRM wireless?
I can't get a consistent zero offset.
Example: I zero offset my srm in the beginning at the ride at, lets say 720.
then I ride around for about 20 minutes and zero offset it to about 680 - which is a huge difference compared to my wired SRM. throughout the ride I can continue to zero offset at values fluctuating as much as 20 points. It even gives me different readings on the small chain ring compared to the big chainring.
When I wake up the powermeter, by turning the crank backwards a couple of times - it usually takes about 3-4 seconds for the powermeter to change from 0 to my zero offset value - this is way longer than my wired SRM.
Does this sound like a bad unit or is the wireless just worse than the wired?

I set mine at the beginning of my ride and never look at it again, so I don't know how or if it would vary. If I stopped for coffee and the outside temperature had changed noticeably, I would reset it.

It does take a few seconds after wake-up to display the offset value.

I was told by SRM by Leslie that " A zero offset variance of 10 Hz will represent a 1watt or less difference – so this is nothing to worry about". So, why am I worried?

I'm worried because they can not answer the real questions which is " why does the wireless offset drifts regularly and the wired unit is usually spot on…"

Example:

Offset pre-ride – 603

Ride (5-min’s into the ride) – 643

Interval 1 (20 min’s in)- 622

Interval 2 (35 min’s in)- 642

Interval 3 (55 min’s in)- 631

End of Ride- 633

With the wired unit, it's always 604 when I set it in the am and ends up around 612 during workouts.... so you have to wonder why...

kennethp said:

I was told by SRM by Leslie that " A zero offset variance of 10 Hz will represent a 1watt or less difference – so this is nothing to worry about". So, why am I worried?

I'm worried because they can not answer the real questions which is " why does the wireless offset drifts regularly and the wired unit is usually spot on…"

Example:

Offset pre-ride – 603

Ride (5-min’s into the ride) – 643

Interval 1 (20 min’s in)- 622

Interval 2 (35 min’s in)- 642

Interval 3 (55 min’s in)- 631

End of Ride- 633

With the wired unit, it's always 604 when I set it in the am and ends up around 612 during workouts.... so you have to wonder why...

seems like we are having the exact same problem...

MintID said:

seems like we are having the exact same problem...

If it is, in fact, a problem... I am seriously considering going back to the wired unit because I trust it.

[b][quote="kennethp"]If it is, in fact, a problem... I am seriously considering [font=Arial]going back to the wired unit because I trust it.[/QUOTE][/font][/b][font=Arial]

If you go the SRM site and click on the blog, you'll see that they've congratulated Amber Neben... if you look at her TT picture, yo'll see that she is using a wired unit. Interesting...[/font]

MintID said:

Anybody out there with a SRM wireless?
I can't get a consistent zero offset.
Example: I zero offset my srm in the beginning at the ride at, lets say 720.
then I ride around for about 20 minutes and zero offset it to about 680 - which is a huge difference compared to my wired SRM. throughout the ride I can continue to zero offset at values fluctuating as much as 20 points. It even gives me different readings on the small chain ring compared to the big chainring.
When I wake up the powermeter, by turning the crank backwards a couple of times - it usually takes about 3-4 seconds for the powermeter to change from 0 to my zero offset value - this is way longer than my wired SRM.
Does this sound like a bad unit or is the wireless just worse than the wired?

I made an effort today to check mine.
It does the same thing.
My numbers are still in line with those from my PowerTaps.