ZUKKA Bike Stem Quill Adapter, Bicycle Fork Stem Riser Extender 22.2/25.4 mm for 1-1/8" Threadless Size Converter (25.4/BLACK)

If you have an older or quill‑based bike and want to modernize it—raising the bars, using modern stems, or improving rider comfort—the ZUKKA Bike Stem Quill Adapter is an excellent tool. It delivers strong build quality, good adjustability, and relatively hassle-free installation. The slight tradeoffs are manageable (just require care in torque and fit). In my estimation, it absolutely deserves 5 stars for the combination of utility, durability, and value.

fit correctly and it works great!!!

Worked great for the conversion from quill stem to modern thread less style. This gives you more options for stems as you can use more modern and available products. Have used on my last couple builds and works great every time.

Height is Ok. Appears well made

This adapter worked fine, but there were a couple of things I didn't like about it. For one, and this was my fault for not measuring the height a bit more carefully, this adapter was a lot longer than I expected so it sat higher than I planned for, which wasn't the end of the world, but I thought it looked kinda goofy. The other thing that I didn't really care for was that it had a tiny bit of wobble to it that I couldn't tighten to get rid of, and while it was okay on the street it wasn't really confidence inspiring for a bit of gravel riding. Other than those two factors it was fine for what it was, but I ultimately replaced it with a different adapter from another company.

solid , easy to use , always check for the right size , fit perfectly with my stem , good value for the money , durable .

Nice quality piece with solid engagement in the fork tube. Tightened with Allen key. Delivered quickly and in good order. Highly recommend.

The diameter of the bottom stem was about 1.5 mm less than than the original assembly but the cast iron quill part broke when applying the necessary tightening torque to ensure a solid connection which would not easily rotate under normal handlebar steering usage. This deficiency in design and/or construction would have dangerous consequences if the fracture had occurred because of additional stress on the component when actually driving the bicycle. The problem was solved by using the original cast iron assembly which luckily had the same thread as the newly supplied tightening screw. As such, I do not recommend this particular model.

Muy bueno Perfecto a como lo necesitaba

Doing a conversion for an old 90s mountain bike to a drop bar setup the stem offers a lot of adjustment to get the bars into a comfortable position with a shorter stem. The other options on Amazon seem to be a bit shorter. If stem height is a concern for you this might be the model you want.

この手の商品の中で長めのものを探して購入。ステムはそのままでハンドルを少し上げることができた

Bueno, bonito y barato!! Excelente para tu proyecto vintage a Algo más moderno.

製品としては大きな特徴はありませんが、Amazon内の他の商品と違い、全長17.4cmあるのが決め手でした。15cm程のアダプターでは太い変換後側が先にフレームでつっかえてしまい、私の自転車ではボルトを締結できませんでした。 Amazon出荷でかつこの長さのものは選択肢が少ないため助かりました。モノは完全に写真通りのもので、特に問題もありませんでした。 これから購入される方は現時点で刺さっているボルトと、フレーム内に入っている部分の長さを計ってから決めることをおすすめします。