I have a GRX Di2 groupset on my bike. Shimano only make these cranks down to 170mm length. I am trying to find a solution to use 160mm cranks, with a power meter, that retains use of the stock GRX chainrings.
Cane Creek make a spider for the eeWing crankset that uses that uses the SRAM 8 bolt interface and accepts Shimano GRX chainrings.
I’m trying to determine if
I can install this spider on SRAM 8 bolt cranksets. Obviously the 8 bolt interface is the same. However, I’m wondering if there’s any strange fit interferance fit issues between the spider and the crankarm.
Cane Creek advertise a 47.5mm chainline for this spider on their eeWing crankset. Does anyone know if the distance from the midline of a bike to the 8 bolt interface is similar with a SRAM Road crank and the eeWing crank. I’m thinking it probably is so that compatibility with direct mount chainrings is retained but would love confirmation if anyone has done it.
I don’t have answers to those questions sorry but I do know that the Magene P505/515 crankset slots into a shimano setup easily and provides a range of crank lengths to choose from. So maybe take a look there. Cost-effective too. I run one on my road bike with Ultegra rings etc.
I don’t believe Magene make a power meter compatible with GRX chainrings. Those rings use two distinct bolt circles for their two chainrings, unlike Shimano’s road groups.
Power2Max does make a crankset with spider based power meter that fits GRX chainrings.
The Cane Creek GRX spider should fit other 8-bolt cranks. The one shorter spline lobe on their 8-bolt spider is aligned with the crank arm, just like SRAM spiders. Note that this was not the case with Cane Creek’s first gen EE Wings that used the older 3-bolt interface, oriented 180° from SRAM ‘s convention.
I tried it on the Croder arms and Rival arms I had on hand. They don’t fit. They made it to explicitly fit Cane Creek arms unfortunately. There’s some interference with the arm itself.
I haven’t returned the spider yet, so I’ll try to take some photos tomorrow if I remember.
As Greogory said Power2Max works perfectly. There is GRX-version for Rotor Aldhu, fits GRX-rings and arms go to 150mm. Also road version with Rotor Aldhu works, need gravel spindle from Rotor to get GRX chainline but battery is double vs P2M grx powermeter. I have the second option with wolftooth 1x chainring with grx di2 11spd.
Wow. Thanks everyone. Could an answer be any better than those photos! Membership paid for by avoiding an expensive mistake. Back to the drawing board! Thanks for the tips on Rotor. I’ve had some poor experiences with their stuff so was hoping to avoid but it seems like it might be the only option.
