CST Acimut Tube - 20 x 1.90 - 2.125 - SV

CST Acimut Tube - 20 x 1.90 - 2.125 - SV

$8.00 USD
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CST Acimut Tube - 20 x 1.90 - 2.125 - SV
  • CST Acimut Tube - 20 x 1.90 - 2.125 - SV
CST Acimut Tube - 20 x 1.90 - 2.125 - SV

CST Acimut Tube - 20 x 1.90 - 2.125 - SV

$8.00 USD
Shipping calculated at checkout.

The CST Acimut 20 x 1.90-2.125 Tube is a reliable, great-value replacement inner tube for 20 inch BMX, kids, cruiser and recreational bikes, offering dependable everyday performance for Brisbane paths, school commutes, family rides and general Australian bike servicing.

CST Acimut Tube Features

  • Fits common 20 inch tyres from 1.90 inch to 2.125 inch wide
  • 40mm valve length gives practical pump access on most compatible 20 inch rims
  • Durable butyl rubber construction for everyday reliability
  • Ideal for BMX, kids’ bikes, cruisers, folding bikes and recreational use
  • Affordable spare tube for puncture repairs, family bike kits and workshop servicing

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Key Features & Technical Specifications

Technical Specifications

  • Product Name: CST Acimut Tube
  • Product Type: Bicycle inner tube
  • Wheel Size: 20 inch
  • Tube Size: 20 x 1.90-2.125
  • Compatible Tyre Width Range: Approximately 1.90 inch to 2.125 inch
  • Valve Type: SV 40mm, commonly listed as a 40mm straight valve option. Confirm valve style against rim before fitting.
  • Valve Length: 40mm
  • Valve Style: Straight valve
  • Material: Butyl rubber
  • Colour: Black
  • Recommended Use: BMX, kids’ bikes, junior bikes, cruisers, recreational bikes, folding bikes where compatible, school bikes and puncture repair
  • Best Bike Type: 20 inch bikes using tyres between 1.90 and 2.125 inches wide
  • Main Upgrade Purpose: Tube replacement, puncture repair, spare tube kit, family bike maintenance and basic bike service

Compatibility Notes

  • Designed for 20 inch wheels only.
  • Best suited to tyres marked 20 x 1.90, 20 x 1.95, 20 x 2.00, 20 x 2.10 or 20 x 2.125.
  • Check the tyre sidewall before purchase to confirm size.
  • Confirm the rim valve hole matches the supplied valve type.
  • If replacing a tube after a puncture, inspect the tyre and rim tape before installing the new tube.
Notable Tech, Materials & Construction

Durable Butyl Rubber Construction

The CST Acimut tube uses dependable butyl rubber, the most common and practical material for everyday bicycle inner tubes. Butyl is popular because it holds air well, offers good puncture repair practicality and provides reliable day-to-day performance.

20 Inch Multi-Size Fit

The 1.90-2.125 inch width range makes this tube suitable for many popular 20 inch bikes, including BMX bikes, kids’ bikes, cruisers and wider recreational tyres. This makes it a handy tube to keep as a spare for family bike maintenance.

40mm Valve Length

The 40mm valve length is suitable for many standard 20 inch rims and gives enough access for most compatible floor pumps and hand pumps.

Practical Everyday Performance

This tube is designed for reliability rather than lightweight racing performance. It is a sensible choice for bikes that see school runs, park rides, BMX-style use, commuting and weekend family riding.

Trusted CST Tube Quality

CST is a long-established tyre and tube manufacturer used across commuter, BMX, MTB, kids’ and recreational bike categories. The Acimut tube is a practical service part for riders who want a dependable replacement without overcomplicating the repair.
Size, Fit, Geometry & Measurements

Tube Fitment

  • Wheel Diameter: 20 inch
  • Tyre Width Compatibility: 1.90 inch to 2.125 inch
  • Common Fit Range: 20 x 1.90-2.125
  • Valve Length: 40mm
  • Valve Type: SV, confirm rim compatibility before fitting
  • Material: Butyl rubber

Fit Checklist Before Purchase

Before ordering, confirm:

  • Your tyre sidewall says 20 inch.
  • Your tyre width is between 1.90 and 2.125 inches.
  • Your rim valve hole matches the tube valve type.
  • Your tyre is not cracked, split or excessively worn.
  • Your rim tape is covering spoke holes correctly.
  • No glass, thorns, wire or sharp debris remain inside the tyre.

Installation Notes

  • Remove the old tube and carefully inspect the tyre casing.
  • Check the rim tape for damage or exposed spoke holes.
  • Add a small amount of air so the new tube takes shape.
  • Fit the tube evenly inside the tyre.
  • Make sure the tube is not pinched under the tyre bead.
  • Inflate gradually and check both sides of the tyre are seated correctly.
  • Recheck tyre pressure before riding.
Who it is best suited for and where it is best suited

The CST Acimut 20 inch tube is best suited to riders and families needing a dependable replacement tube for 20 inch bikes used for BMX, school rides, commuting, park riding and recreational cycling.
Product Care & Warranty Info

Product Care

  • Check tyre pressure regularly.
  • Keep tyres inflated within the range printed on the tyre sidewall.
  • Inspect tyres for glass, thorns, wire or sharp debris.
  • Check rim tape if punctures occur on the inside of the tube.
  • Avoid riding under-inflated, as this can cause pinch flats.
  • Replace cracked, worn or damaged tyres.
  • Store spare tubes away from heat, sunlight and sharp tools.
  • Do not overinflate outside the tyre.
  • Use care when fitting with tyre levers.
  • Recheck the tyre bead after installation before riding.

Warranty Information

  • Warranty coverage is subject to CST or retailer terms and conditions.
  • Warranty generally applies to manufacturing defects such as faulty seams or valve defects.
  • Punctures, pinch flats, incorrect installation, tyre damage, rim tape failure, overinflation, underinflation, heat damage and impact damage are generally not covered.
  • Tube life depends on tyre condition, rim tape condition, pressure, rider weight, road surface and installation quality.
  • Professional installation is recommended if punctures keep returning or if the cause of air loss is unclear.
Industry & Rider Feedback. A few Comparison Options

Rider feedback around CST replacement tubes is generally positive when the correct size and valve type are selected.

Common positive rider comments include:

  • Good value for basic puncture repair
  • Reliable everyday tube for kids’ bikes and BMX bikes
  • Practical spare tube to keep at home
  • Fits common 20 inch wider tyres

Kenda 20 Inch Tubes

  • Widely available replacement option
  • Reliable for BMX, kids’ and commuter bikes
  • Similar everyday performance
  • Good alternative if CST is unavailable

Maxxis 20 Inch Tubes

  • Often positioned as a slightly more premium option
  • Good rubber quality
  • Suitable for BMX and junior MTB use
  • Usually higher cost than basic tubes

Thorn-Resistant 20 Inch Tubes

  • Thicker rubber for improved puncture resistance
  • Heavier and less lively than standard tubes
  • Better for thorn-prone areas and rough paths
  • Ideal for riders dealing with frequent flats

Self-Sealing 20 Inch Tubes

  • Sealant inside the tube can help seal small punctures
  • Heavier and messier than standard tubes
  • Good for families wanting fewer puncture stops
  • May require more careful maintenance over time

Where the CST Acimut Tube Stands Out

  • Trusted CST replacement quality
  • Practical size for wide 20 inch tyres
  • Affordable puncture repair option
  • Good for BMX, kids’ and family bikes
  • Useful workshop and home spare
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