TRU45SH 45mm carbon road bike tubeless hookless rim

Item No.: TRU45SH

Size: 700C

Material: Full Carbon Toray T700 & T800

Type: Clincher (Tubeless Ready) hookless

Weight: Standard 415±15g, Flyweight 385±15g

ERD: 550mm

Inner Width: 21mm

Outer Width: 28mm

Depth:  45mm

Holes: 18-32H

Brake System: Disc brake only

Max Spoke Tension:  140kgf

Max Tire Pressure: 50psi

Max Weight Limit:  90kg

Braking  System: Disc Brake

Applicable Bicycle: Road/CX/Gravel

Appearance: UD/3K/12K

Finishing: Matte/Glossy

Standard: En Standard

Assembly Hole Dia: 8.5mm

Spoke Hole Dia: 4.5mm

Valve Hole Dia: 6.5mm

Roundess:<0.3mm

What’s the deal with hookless rims? Why road tubeless standards are a mess and how they're slowly getting fixed

Hookless rims have a number of claimed advantages that we’ll get into in more detail below.

A hookless rim is simply one with a profile that lacks bead hooks, the protruding edges that help retain conventional clincher tyres under pressure.

Instead, a hookless rim has straight, vertical sides, and indeed in wheel maker circles the technology is often referred to as “tubeless straight side” or TSS (not to be confused with “Training Stress Score”, a performance metric developed by TrainingPeaks).

Hookless rims have been around for mountain bikes for years, but in the road world, where tyre pressures are typically much higher, they’re relatively new.

Hookless rims are usually tubeless-only, i.e. you must run a tubeless-specific tyre, which will have a stiffer bead than a conventional tubed clincher.

It is possible to run a tube (e.g. in the event of a puncture that sealant won’t fix) but only in that same tyre – it’s not usually considered safe to swap to a standard clincher tyre.

On the face of it, you might assume a hookless rim is less safe than a hooked one, but the reality appears to be much more nuanced.

The safety of a rim–tyre interface is heavily dependent on the tolerances of the two components and proponents of hookless claim it’s perfectly safe (or indeed safer than hooked) and offers real performance benefits.