This adapter replaces a quill stem on a threaded-fork bike and lets you use Aheadset-style stems, in case you'd prefer that.
Most frames have used 1-inch threaded steerers with 22.2mm internal diameter. Some MTB frames from the 90s use "oversized" 1-1/8" threaded steerers with 25.4mm internal diameter. If you're not sure we highly suggest...
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prompt and convenient delivery from the online store. Thanks!