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Step 1: Measure your height

Take off your shoes
Stand with your back straight against a wall
Balance a book on your head to mark your height on the wall
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Step 2: Adjust your inseam

Based on your height, we’ve calculated a starting point.
You can measure your inseam by tucking a book between your legs so there is pressure but it isn’t uncomfortable.
Inseam typically falls with 5cm of the average.

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Shop CST

CST stands for dependable quality without the fuss. Feel confident on every ride thanks to tyres and tubes that bring rugged reliability, everyday comfort and unmatched puncture protection – all in gear that won’t punch a hole in your budget. Get back to riding what matters: the road, trail or path under your wheels.

The CST Story

CST is the bicycle brand of Cheng Shin Rubber, also known as Cheng Shin Tyre, founded in 1967 in Taiwan. It grew to become one of the world’s largest manufacturers of bicycle tyres and tubes, backed by factories in Taiwan, China and beyond, and distribution in over 150 countries. The brand’s heritage means serious knowledge in rubber technology and tyre construction.

That legacy filters into every CST tube and tyre found at 99 Bikes. From puncture-resistant sidewalls to tubeless-ready casings, the same engineering that powers global fleets helps keep mainland riders rolling confidently on local roads and rugged tracks.

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Why Ride CST?

Trusted engineering from Cheng Shin Rubber. Founded in 1967, CST draws on over five decades solving challenges in rubber science and tyre manufacturing to deliver durable tubes and tyres built for real-world riding.
Protection Technology to reduce flats. Features like the SAFE system, COBWEB anti-puncture layer and Defender protection all combine to protect against cuts and punctures, letting you ride with fewer worries.
Tubeless Ready and dual-compound tech for better grip and comfort. Many CST MTB tyres now include tubeless-ready bead profiles and dual-compound rubber to improve grip and reduce rolling resistance.
Accessibility at solid value. CST keeps manufacturing efficient and scale large, so entry-level and mid-range riders get tech that helps avoid frequent replacements. Strong butyl tubing, reliable valve options and tough casings offer longevity on a budget.

Popular CST Ranges Explained

CST Schrader

The CST Schrader tubes use a wider American style (Schrader) valve and strong butyl rubber for reliable inflation and durability. Ideal if your rims are set up for Schrader valves and you want low-maintenance tubes. Every ride stays pumped.

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CST Presta

CST Presta tubes include the longer, thinner French style (Presta) valve that fits many road and performance rims. These tubes are lighter and allow for finer pump interface where every gram and every valve-head counts.

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CST Acimut

The Acimut series spans wire and Presta/Schrader options to match common tyre widths. Built with reliable wall thickness and solid valve lengths, Acimut tubes give you flexibility and trustworthy performance on commuter or trail setups.

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CST C1854

The C1854 ‘Vault’ youngest-rider’s tyre offers kid-friendly 20-inch sizing with wire bead construction. Grip, sidewall reliability and easy tube pairing help keep bikes rolling younger wheels with safety in mind.

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CST Caldera

The Caldera road / foldable-wall tyre combines smooth sidewalls, reflective elements and designs suited for sealed surfaces. It balances grip and low rolling resistance so road riders travel farther with steady comfort.

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CST Jack Rabbit

The Jack Rabbit Mountain Bike tyre brings wider wire-bead tread suited for rugged trails. Strong side knobs, solid carcass and classic sizing help it cling to loose dirt and roots without breaking the bank.

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