The photo is not accurate. The description says "freewheel" protector, and that probably is accurate. I ordered half a dozen of the 34 tooth version to protect my small fleet of mtn bikes from bend derailleurs. Tried first one on a Deore hub with an 11x34 Shimano cassette. It doesn't have those 3 teeth, as in the photo (that I expected to hook onto spokes). Instead, it has multiple teeth, and I think it's meant to cram in between a freewheel body and the spokes? On a cassette, it crams in there and the cassette can no longer freewheel anymore. I'll have to return the unused ones.
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OneUp DH Block Cassette Spacer Downhill bikes benefit
from small gear ranges with even gear-progression throughout the cassette. Paired with a clutch rear derailleur this maintains proper tension on the chain and less slack when going through rough terrain, eliminating ...