FISCHER Bicycle Tire 20" (57-406 / 20 x 2.125) ETRTO 57-406, single piece

FISCHER Bicycle Tire 20" (57-406 / 20 x 2.125) is a single replacement tyre designed for bicycles with 20-inch wheels that conform to the 57-406 ETRTO specification. This tyre provides a 2.125-inch (approx. 54 mm) wide tread profile commonly used on small adult and youth bikes, folding or rigid rims and recreational urban cycles. Supplied as one piece, it is intended to replace worn or damaged tyres while preserving ride geometry and clearance for frames and forks built for the 57-406 size.

Advantages

The tyre offers a consistent tread width and construction matched to the 57-406 standard, enabling straightforward fitment on compatible rims and tubes. Its profile balances rolling comfort and stability for everyday urban and leisure riding. Supplied individually, the product allows selective replacement of a single tyre without buying a pair, which can be practical for cost-effective maintenance.

Suitable for

• Small adult bicycles and youth bikes with 20" wheels
• Urban commuting and short recreational rides
• Bicycles requiring a 2.125" (approximately 54 mm) tyre width
• Replacement of a single worn or damaged tyre on compatible rims

When it may not be suitable

This tyre is not suitable for bikes that require a different ETRTO size — for example, 451, 406, or other 20-inch designations that do not match 57-406 — and will not fit rims or frames with incompatible clearances. It is also not intended for high-performance racing, heavy off-road mountain biking, or e-bike applications where specific reinforced or puncture-resistant tyres are recommended.

Key specifications

• Wheel diameter and tyre size: 20" (ETRTO 57-406)
• Tread width: 2.125 inches (approx. 54 mm)
• Quantity: single tyre (1 piece)
• Intended use: urban and recreational riding

How to use

Mount the tyre on a rim that conforms to the 57-406 ETRTO specification using appropriate tyre levers and standard mounting procedure. Ensure the tyre bead seats evenly on the rim and inflate gradually to the recommended pressure range for the rim and tube in use. Check that the tyre rotates freely without rubbing the frame or brake components and verify tube compatibility and valve type before final inflation. Inspect the tyre for any visible damage after installation and before each ride.

What to consider before purchase

• Confirm your rim and frame clearance are compatible with the 57-406 ETRTO size and ~54 mm tyre width
• Verify the tyre profile suits your typical riding surface (urban/recreational)
• Check whether you need a single tyre or a pair for replacement
• Ensure tube valve type and size match your rim and this tyre

Usage recommendations

For reliable daily performance, maintain correct tyre pressure, inspect for cuts or embedded debris regularly, and replace the tyre when tread or sidewall wear compromises safety or handling.