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Your cart is empty. Product name: Flywheel Spoke Protector
Material: Plastic
Color: Black
Size: Outer diameter: 138mm / 5.43in
Inside diameter :37 mm /1.46 in
Bicycle chains are used to protect the steel wire inside the rear flywheel.
Suitable for mountain bike variable speed flywheel chain guard. It can keep the bicycle spokes stable and will not fall off.
Chain protectors for wheel hubs and variable speed flywheels of mountain bike disc brake boxes.
The disc can be versatile, and the choice of large or small disc depends on the largest teeth of the flywheel.
Kit includes :2 Flywheel Spoke Protectors
Michael B. Maxwell
Reviewed in the United States on February 21, 2025
I am rebuilding a mountain bike that has a 9-speed Shimano cassette. The chain had previously slipped off the largest gear, onto the wheel. The result was that it chewed up the 8 spokes closest to the gears, which I had to replace. In theory, you can prevent the chain from slipping off like that by properly adjusting the rear derailleur--but things happen, and I didn't want to have to replace those spokes again. Hence the need for a spoke guard.I've tried several other spoke guards, but none fit right: they all interfered with being able to attach all 9 gears in the cassette. (The 7 largest gears are attached to each other, and fit easily--but the two smallest are separate pieces, and I couldn't get the smallest one to engage with the hub when I had one of the other spoke guards on.) This spoke guard fits the hub. When I tighten down the cassette lock ring, the spoke guard rotates with the gears, and rubs slightly against the spokes; this would of course only happen when I'm not peddling, but it probably will result in wear on this plastic spoke guard (I don't think it will harm the spokes). I tried installing the spoke guard upside down, but that puts its rim too close to the largest gear. The concave side of the spoke guard has to be towards the wheel.Why a point off? Only because the seller's description is...strange: "easy to carry and store", "easy to carry and install"--why would that matter? You can only replace this by removing the wheel and the cassette, not something you're going to do on the trail. "protect the steel wire in the rear flywheel": odd terminology, it protects the spoke on the rear wheel (which is not a flywheel). "chain strapper guard": never heard it called this. "does not require additional installation tools": sort of true, in that once you have the cassette off, you just slip this protector on; but in order to get the cassette off, you'll need a cassette lockring tool and a chain whip, both of which are specialized tools. "Chain Lifter Shield" (in the title): I'm not sure what a "chain lifter" is--maybe they mean the rear derailleur, but the derailleur is on the outside of the cassette, and this is on the inside--so it has nothing to do with shielding the derailleur.If you have a Shimano hub like mine, this is probably what you want. But do measure carefully--this fits a 35 or 36mm (or possibly 37mm) hub, as measured at the widest point (outside the "ribs" that hold the cassette). It would not go on a larger hub, there are larger spoke protectors that will.
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