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Bicycle Components & Parts

julio 26, 2026

BICYCLE STEM ADAPTER 21.1MM BLACK or SILVER THREADLESS ALLOY BIKES

There are a lot of parts and accessories in my e-bay store, please take a look. Thanks! ONE brand new bicycle stem adapter. Available in anodized black and silver. Alloy threadless for A-head. Convert 21.1mm to 28.6mm threadless Adapter is 6" long top to bottom. Item will be shipped out within 2 days after a cleared payment received . Return is acceptable within 14 days and shipping is non-refundable.
julio 26, 2026

Suntour style old school 21.1mm quill BMX bicycle stem – SILVER

Old school style stem - chrome quill - silver aluminum alloy top and cap. No name brand. Pretty much a copy of the 1980's Suntour stem. Size: 21.1mm quill Brand new, never mounted. There are pock marks from the manufacturing process on the aluminum surfaces - this is normal for how this stem is made - it is not a defect.
julio 26, 2026

Alloy bicycle «fully ramped» stem wedge solid bolt M8 x 1.25 (21.1mm O.D.)

Bicycle stem wedge - made for us by Dia-Compe as an upgrade to cast stem wedges. Material: Aluminum alloy * 21.1mm with M8 X 1.25 threading - for most Asian made stems with a solid quill bolt. NOTE: This is a fully ramped/angle wedge. They will not fit Tuf Neck or Pro Neck stems (which take a SAE threaded wedge and are stepped). Also will not fit Anlun Group One or ACS stems that take a stepped wedge.
julio 26, 2026

Stem stiffener for old school BMX 21.1mm quill bicycle stems – BLACK/SILVER

Old school BMX quill stem "stiffener" - known as a stem stiffener or flex fighter, this machined aluminum sleeve fits on your 21.1mm diameter BMX stem quill. Just tighten your stem wedge with this sandwiched tightly between your stem and headset locknut and you will minimize flex in your stem quill. Color: BLACK Material: Aluminum Height: 29.2mm (just shy of 1 3/16") Fits quill size: 21.1mm