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