I'm trying to use a 1" threaded fork on my threadless 1/18 frame will this do the job?

No, I don’t think so. This converts a threaded fork - in a frame designed to take such - to use a bolt-on A-Head stem. The adapter will not help in fitting your threaded forks to your frame.

Would this work as 1 1/8 I’m converting from an old quill stem

Yes, it will work with a 11/8th stem if you use a shim to increase the diameter of the top part of the adapter. These can be bought from most good online shops - M-Part do one in black but others are available. They cost (from memory) about £2 - £3.

What is the height of the section where the stem attaches? Will I need spacers if the clamp height on my stem is 40mm?

I've used this with a Planet X 31.8 oversized stem. Note that this is the clamping diameter NOT the height of the clamp. I did need to get a shim adapter to clamp this stem onto the Deda quill stem adapter. Unless your stem is unusually high with the clamp this will be fine.

The description is so confusing…is this a 1” to 1 1/8” adapter?

It is an awful description. I bought this wanting a 1" to1⅛" stem adaptor but received a 22.5mm to 1⅛" adaptor. When I re read the description ieorked out that this is 22.5mm and WILL FIT A 1" steerer with a shim (that they call a washer) I sent it back and bought what iactually needed. This should be removed from sale until the description is re written by an English speaker

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Deda Elementi Men's Spada Quill Stem Adapter, Black, 22.2mm / 25.4mm

Product ID: 48373706

Details

Brand
Deda Elementi
Colour
Black
Item weight
140 Grams
Material
Aluminium
Unit count
1.0 count

📏Fits 22.2mm steerer to 25.4mm stem

🔧Compatible with vintage & modern stems

⚙️Machined aluminium alloy for durability

VT8944

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Description

⚡ Upgrade your ride, bridge the eras in style!

SLEEK BLACK FINISH - Minimalist design that complements any bike style, from retro to contemporary
TRUSTED QUALITY WARRANTY - Backed by a 2-year manufacturer warranty for peace of mind
PRECISION MACHINED ALUMINIUM - Lightweight yet robust build ensures lasting performance and sleek aesthetics
VERSATILE STEM COMPATIBILITY - Supports 25.4mm stems and can adapt to 1 1/8” stems with optional reducer
SEAMLESS VINTAGE TO MODERN UPGRADE - Effortlessly fit threadless 1” stems on classic 22.2mm quill forks

The Deda Elementi Spada Quill Stem Adapter is a precision-machined aluminium alloy component designed to convert traditional 22.2mm quill forks to accept modern 25.4mm (1”) threadless stems. Its sleek black finish and compatibility with optional reducers for 1 1/8” stems make it the perfect upgrade for vintage bicycles seeking contemporary handlebar setups, backed by a 2-year warranty.

Specifications

ASIN	B0083QRHAE
Best Sellers Rank	41,272 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 63 in Cycling Stems
Brand Name	Deda Elementi
Colour	Black
Country Of Origin	Taiwan
Customer Reviews	4.2 4.2 out of 5 stars (310)
Global Trade Identification Number	08051406523329
Included Components	1x Stem Adapter
Item Type Name	Quill Stem Adapter
Item Weight	140 Grams
Manufacturer	Deda Elementi
Manufacturer Part Number	SPADA
Manufacturer Warranty Description	2 year manufacture
Material Type	Aluminium
Model Number	SPADA
Number of Items	1
Number of Packs	1
Unit Count	1.0 count

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VT8944

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Pooja R.

The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

View all Trustpilot reviews