Will this fit a Carrera subway?

It should if it has a straight 1.1/8 head tube.

Does this fit for 49mm id as got a bike with 49mm head top and bottom and need headset for it

This unit is designed for a 49mm outside diameter and a mounting bore (inside Diameter) of 44mm. So I'd suggest that you follow the advise from a previous answer to this question and remove the existing bearing and get what data you can from that. AWR

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X-BIONIC FSA No.11N Semi-Integrated Headset - Black, 1.1/8-Inch

Product ID: 48994594

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Details

Brand
FSA
Colour
Black
Ear placement
On Ear
Form factor
In Ear
Impedance
5 Ohm
Noise control
Sound

⚖️Ultra-lightweight 150g design

⚙️1.1/8" semi-cartridge precision fit

🛠️Chromyl cups for durability

Description

⚡ Upgrade your ride with precision and power!

COMPLETE REPLACEMENT KIT INCLUDED - Top and bottom bearings plus crown race spares keep you ready for any maintenance on the go.
OPTIMIZED FIT FOR 49 MM HEAD TUBES - Perfectly tailored 1.1/8" size guarantees compatibility and stability for your bike frame.
DURABLE CHROMYL ALLOY CONSTRUCTION - Robust metal build with chromyl cups designed to withstand intense cycling conditions.
LIGHTWEIGHT DESIGN FOR PEAK PERFORMANCE - At just 150 grams, this headset keeps your bike agile without compromising strength.
PRECISION ENGINEERING FOR SMOOTH STEERING - Semi-cartridge bearings ensure seamless control and responsiveness on every ride.

The X-BIONIC FSA No.11N Semi-Integrated Headset is a high-performance cycling component designed for 1.1/8" steered bikes with 49mm head tubes. Featuring a semi-cartridge bearing system with durable chromyl alloy cups, it offers smooth steering and long-lasting reliability. Weighing only 150 grams, it balances strength and lightweight agility, making it an essential upgrade for serious cyclists seeking precision and durability.

Specifications

Included components	niemand
Age range (description)	Adult
Material	Metal
Specific uses for product	cycling
Recommended uses for product	Cycling
Cable feature	Retractable
Item weight	0.15 Kilograms
Package type	Standard Packaging
Unit count	1.0 count
Style	No.11N
Color	Black
Size	1.1/8-Inch
Height	6 centimetres
Item display length	6 centimetres
Weight	0.16 Kilograms
Item display width	6 centimetres
Material type	Metal
Number of items	1
Seasons	continuity 2012
Features	Lightweight
Batteries included?	No
Department	Unisex
Manufacturer	FSA
Item model number	141-2281
Product Dimensions	6 x 6 x 6 cm; 150 g
ASIN	B005HHUCXG

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