Rotor Cranks with Shimano Chainrings: Triathlon Forum: Slowtwitch Forums

Rotor Cranks with Shimano Chainrings

Oct 23, 23 13:20

I'm swapping cranksets on my bike and want to double check that I'm not missing anything before I order things. I'm swapping from 165 Shimano Ultegra to 155 rotor Aldhu24. The bike is a P-Series with the stock bottom bracket (PF for Shimano)

I'm buying:
- 155mm Aldhu24 cranks
- 24mm road axle
- Spider BCD 110x4 DIN

I plan on moving the existing Shimano chainrings to the Rotor crankset - do I have the correct spider for that? I know that Shimano is 110 BCD, but I'm confused by the fact there are two 110 spider options on Rotor's site.

SPIDER BCD110X4 DIN 1X/2X
SPIDER BCD110/80X4 DIN

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Re: Rotor Cranks with Shimano Chainrings [kerikstri] [ In reply to ]

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_Nickel_

Oct 23, 23 16:11

Post #2 of 3 (590 views)

The 110 80 spider is for Shimano GRX. Not sure if there's only one "pure" 110 spider or multiple. Shimano uses asymmetric mounting bolts, but FSA and SRAM have their own 110 spacing IIRC - make sure the spider says Shimano road.

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Re: Rotor Cranks with Shimano Chainrings [kerikstri] [ In reply to ]

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refthimos

Oct 23, 23 16:15

Post #3 of 3 (590 views)

110 4-bolt BCD is for standard road rings - 53/39, 52/26, 50-34, etc. Both chainrings use the same 110 BCD.

110/80 BCD has a smaller BCD for the small ring (that's where the 80 comes in) , which allows for a smaller inner ring, typically for gravel riding. This lets you use something really small like 30 for your inner chainring - and the big ring will need to be smaller as well to allow for FD shifting.

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