Bola 700c 50mm non‑symmetric Carbon Tubeless Rim, 28mm Wide

If you chase flat‑out aerodynamic speed for road races, triathlon time trials and fast gran fondo, this Bola 50 mm asymmetric carbon rim deserves your full attention. Many deep‑section 50‑plus rims on the market suffer two well‑known pain‑points: bad spoke‑tension balance on disc‑brake builds, plus overly‑twitchy handling under cross‑wind gusts. This rim addresses both of those headaches right from the carbon mould.
The non- symmetric U‑shape profile reshapes the rim bed to compensate for disc‑brake uneven spoke angles. When professionally laced, drive‑side and non‑drive‑side spoke tension levels out significantly. You get higher lateral stiffness for hard sprints, less truing drift over thousands of training kilometres, and longer overall wheel service life — something many generic symmetric deep rims struggle to deliver.

Geometry breakdown
‑ Outer width: 28 mm
‑ Internal width options: choose 21 mm or 23 mm
 ▪ 21 mm internal: optimised for narrow‑profile 25‑38 c race tyres, maximum aerodynamic gain for TT / crit racing
 ▪ 23 mm internal: built for 27‑40 c endurance tubeless tyres, more comfort for long‑distance gran fondo events
‑ Available bead: hooked OR hookless, fully ETRTO‑ISO compliant, tubeless‑ready out‑of‑factory

Pick your carbon lay‑up weight tier to match your riding goals:
- 370 g Extreme‑Light: Triathlon / TT priority, minimum rotating mass for race‑day
- 390 g Ultra‑Light: Race‑day balance of aero performance and impact toughness
- 430 g Super‑Light: Gran fondo and frequent weekly training
- 470 g Standard: Maximum wall thickness, for rough urban roads and heavier‑weight riders

Crafted from blended Toray T700 / T800 unidirectional carbon‑fiber. Multiple spoke‑hole drillings (20 / 24 / 28 / 32 H) so you can match virtually any road‑spec hub, both rim‑brake and disc‑brake compatible.
Every rim completes strict ISO 4210‑7 lab validation: 750 000‑cycle fatigue test, >40 J impact resistance. In‑house QC verifies roundness, flatness, concentricity and spoke‑hole alignment before shipping. Max system weight is 110 kg for professionally assembled wheels.
Real‑world builder insight
Most factory‑built 50 mm deep‑section wheels lock you into fixed hub‑spoke packages. Buying this bare rim puts you fully in control. Pair it with DT Swiss, Chris King, or value‑focused aftermarket hubs; select Sapim or your preferred spokes. Build a dedicated race‑day wheelset, a tough backup training set, or simply swap out one damaged rim instead of purchasing an entire expensive wheelset.
Where this rim shines
✅ Triathlon & Time‑trial builds for flat & rolling‑course speed
✅ Road racing, criteriums, fast sprint‑heavy events
✅ Gran fondo & long‑distance endurance road riding
✅ Custom DIY wheel projects, single‑rim replacement
✅ Both rim‑brake and disc‑brake custom builds
Where it is NOT ideal
❌ Aggressive gravel racing, cyclocross mud racing, mountain‑bike impacts
❌ Riders exceeding 110 kg total system (rider + bike + gear)
❌ If you want pre‑built ready‑to‑ride complete wheels
Builder warning
Accurate spoke‑length calculation, proper lacing and precise spoke‑tension calibration are mandatory. Poor wheel‑building practice will damage the rim and void manufacturing warranty. If you lack wheel‑building experience, deliver it to your local professional bike shop.