Geoid PM500 power meter

[hahel]

I encountered a bug after installation. I performed a calibration using my Garmin watch, but although I purchased the 165 mm version, Garmin displays the sensor length as 172.5 mm in its details. After my first ride, the recorded data appears to be doubled. I’ve contacted the Geoid Support Centre and will see how they respond.

Cranklength should be irelevant for a spider powermeter, all relevant measurments for tourque/power is related to the spider BCD and cadence.

[Shayzzz]

I encountered a bug after installation. I performed a calibration using my Garmin watch, but although I purchased the 165 mm version, Garmin displays the sensor length as 172.5 mm in its details. After my first ride, the recorded data appears to be doubled. I’ve contacted the Geoid Support Centre and will see how they respond.

Hello, any updates about your issue? How was the support ? Thanks

[ediryppah]

Bought it to hopefully mount on a 1x GRX with a 46T Pass Quest chainring.
I now realized I don't know if I can add BB-spacers with this PM due to the crank interface (which I might need to to get the chainring away from the chainstay).
I have not clue if it's gonna work or not but we'll see. I'll report back.

Worst case I sell/gift it to a friend.

[LiGuangming1981]

This looks great. Was planning on a P515 for an upcoming bike build, but since this is basically a P505 (which I have had good experience with) and costs 2/3 of what a P515 does, I think I might go this direction instead.

[Rebel_Yell]

This looks great. Was planning on a P515 for an upcoming bike build, but since this is basically a P505 (which I have had good experience with) and costs 2/3 of what a P515 does, I think I might go this direction instead.

Where can you find the P505 for 2/3 price of P515?

[SaunaBiker55]

Dual recording with the Geoid compared to a Kickr Core 2.  Looks pretty clean.  Happy with the two Magene 505s I have.  Got this one to fit a new bike with a T47.

[alfiomotrambo]

Where can you find the P505 for 2/3 price of P515?

Maybe get a used one? Didn't find any crazy price online

[ediryppah]

Can anyone confirm my suspicion that they are using a single crank arm geometry and just changing the location where the threaded hole is?

This dimension on my crank arm (170mm) looked surprisingly big and I would not be surprised if the actual crank arm is the same length for all effective crank lengths.

Not a huge deal unless someone plans to use this PM for riding over rougher terrain.
On road/fast gravel the risk is pedal striking but if it’s going over rocky stuff you always hit the end of the crank arm on a rock.

[Super_davo]

I have 165s and they definitely do not have a comically large amount of metal sticking out past the hole (which would be the case based on your theory bearing in mind they are also sold as 175s)).

[ediryppah]

I have 165s and they definitely do not have a comically large amount of metal sticking out past the hole (which would be the case based on your theory bearing in mind they are also sold as 175s)).

I found my 170s to look weird. I checked a normal Shimano-cranks and the same distance is 10mm.

I also did some testing on my powermeter and it's not great.
At first installation with 2mm BB spacer and it was like -10% compared to my Kickr, except on sprints where it was spot on.
Reinstalled without spacer and not it's at an "acceptable" -2-3% but not super consistent. After a sprint it's -7% but sort of readjusts it seems.

[bedampft]

FYI

Difference between Geoid 500 Crankset and Magene PES505 Crankset

1. The Senicx PR3 crankarms are slightly more outwards curved, while the Magene PES505 are straight and run diagonal between spindle and pedal eye. I always had issue running a 105 Di2 or GRX 12s Di2 FD, because it was rubbing against the driveside Magene arm in the bigring and high gears. Only solve was to use an Ultegra Di2 FD. With the Senicx there is way more room.

2. The Senicx PR3 Crankset that comes with the Geoid 500 has about 3mm shorter chainline than the Magene PES505! I now have the issue that my 34 inner ring is only 1 mm away from the chainstay. With the Magene arms I has about 4 mm of space to the frame.

Tomorrow I'll try to see if the Geoid Spider has a different chainline from the PES505. But I suspect not.

[adrian9211]

Hello, any updates about your issue? How was the support ? Thanks

Looks like after few calibrations looks accurate. Recommend.

[LiGuangming1981]

Where can you find the P505 for 2/3 price of P515?

This one, the PM500 from Geoid, is 2/3 the price of a Magene P515 here in China - 1000RMB with cranks for the Geoid, 1500RMB with cranks for the P515.

Since the PM500 is also from Magene, if it works well it's a no brainer at that price difference.

[toggle]

FYI

Difference between Geoid 500 Crankset and Magene PES505 Crankset

1. The Senicx PR3 crankarms are slightly more outwards curved, while the Magene PES505 are straight and run diagonal between spindle and pedal eye. I always had issue running a 105 Di2 or GRX 12s Di2 FD, because it was rubbing against the driveside Magene arm in the bigring and high gears. Only solve was to use an Ultegra Di2 FD. With the Senicx there is way more room.

2. The Senicx PR3 Crankset that comes with the Geoid 500 has about 3mm shorter chainline than the Magene PES505! I now have the issue that my 34 inner ring is only 1 mm away from the chainstay. With the Magene arms I has about 4 mm of space to the frame.

Tomorrow I'll try to see if the Geoid Spider has a different chainline from the PES505. But I suspect not.

Did you Check the spider? Are geoid and pes505 spiders identical concerning Chainline?

[bedampft]

Did you Check the spider? Are geoid and pes505 spiders identical concerning Chainline?

Ah, yes, forgot to post it here.

The Magene Spider is indeed different, only adds 1mm to the offset. For me it was enough to clear the chainstay. So I'm running now the Senicx crank with the 505 spider.