Magene P505 PES Base Spider Powermeter

[Bigbobby1482]

Anyone know if you can slap the "new" 48/31 GRX820-2 chainrings on this bad boy? Might wanna try it for an upcoming gravel build. According to Shimano they also feature 110/80 BCD, 4 bolt chainrings - so should fit? Or is there any other nuance to it that I overlooked?

https://bike.shimano.com/products/components/pdp.P-FC-RX820-2.html

It won't fit the small chainring that grx use, because of 80mm BCD. You need both chainrings to be 110mm.

As I understand it, all chainrings under 34t can't be 110 bcd because of their small diameter. Probably why mtb chainring are usually 104 bcd.

Maybe you could get a 34t and use 48/34 if FD will shift well with that combo.

[SillyMochi]

Ah bummer, yeah I see it now. Inner and outer ring have separate mounting ports. Hence the 110/80mm; makes sense now. I searched around a bit and found two manufacturers that actually offer 46/30T 110 BCD options: absoluteblack for an whopping 193€ + shipping and bikinGreen for a more reasonable 94€.

Both use some trickery to bolt the small chainring to the 110 spacing. They look a bit "experimental" but another search showed several posts from happy customers across several biking forums.

Edit: Stone also offers a reasonable 46/32T combo in 110 BCD: https://vi.aliexpress.com/item/1005004259412907.html

[00Garza]

same set up here,great job

Also my setup on my gravel bike. Minimal wear on the chainring after a few thousand miles with a few races thrown in.

[ejump0]

today i checked the app(to check batt statu), n theres fw update.
mine was with 0.118.
available update to 0.120

[Avalius]

today i checked the app(to check batt statu), n theres fw update.
mine was with 0.118.
available update to 0.120

Careful with the update, that's the update that made me search for the reset trick on this device. It updated and got stuck ;-) Just a headsup. Reset trick is in the first post

[JalopnikGo]

Anyone know if passquest chainring is compatible with SRAM 12 speed AXS flat top chains? I just bought the p505 PES and matched with with a chainring from ali.

After reading around, it seems there might be an incompatibility with flat top chains? Wonder if anyone has first hand experience on how to mix all of this together.

[kubackje]

Anyone know if passquest chainring is compatible with SRAM 12 speed AXS flat top chains? I just bought the p505 PES and matched with with a chainring from ali.

After reading around, it seems there might be an incompatibility with flat top chains? Wonder if anyone has first hand experience on how to mix all of this together.

There are specific versions of those chainrings for AXS. They literally have AXS in the name. Hard to miss

[jonathanf2]

Finally got my Magene RX power meter installed, which was parted from a ZRace crankset+magene setup. It was cheaper buying it this way versus the stand alone unit. 

[SillyMochi]

I see you are also using a Raceworks carbon crank? Is it this one? https://www.aliexpress.com/item/1005006794337930.html
Can you simply swap the powermeter spider off the Magene/Zrace crankset and onto the Raceworks?

[jonathanf2]

I see you are also using a Raceworks carbon crank? Is it this one? https://www.aliexpress.com/item/1005006794337930.html
Can you simply swap the powermeter spider off the Magene/Zrace crankset and onto the Raceworks?

Yes, as long as it’s a 3 bolt crankset. The Zrace crankset is actually not bad. It’s well made, but it has a 29mm spindle axle and I prefer 24mm on bsa threaded frames for the bigger bearings. Also I found using Shimano chainrings the most effortless. I might pick up an Ultegra chainring setup later on for the slight weight reduction. I’m using a spare 105 chainring and it’s about a 50g weight difference.

[SillyMochi]

Thanks! Why are you running those over the Magene PES crankset? That also features a 24mm spindle. Just the weight savings?

[TidyDinosaur]

Thanks! Why are you running those over the Magene PES crankset? That also features a 24mm spindle. Just the weight savings?

Just to be sure I will say it again. You can not use the PM that is on the base crank on any other crank.

[SillyMochi]

Oh, I see, the ZRACE x MAGENE actually uses the MAGENE P505-S1103 version. I didn't think they use a different mounting on their own crankset. Weird choice ...

Good call TidyDinosaur to mention it again. Might have fooled someone (totally not me! ).

[TidyDinosaur]

Oh, I see, the ZRACE x MAGENE actually uses the MAGENE P505-S1103 version. I didn't think they use a different mounting on their own crankset. Weird choice ...

Good call TidyDinosaur to mention it again. Might have fooled someone (totally not me! ).

Yeah, it was directed at that friend of yours 

[jonathanf2]

Yeah, it was directed at that friend of yours 

Yeah I forgot to mention this is the P505-S1103 power meter! 

I actually prefer using this 3 bolt spider just because 3 bolt cranksets are plentiful on AliExpress and the spider allows multiple chainring configurations. Though Shimano chainrings seem to work the best out the box.