Bola 700C Offset Tubeless Carbon Road Rim — 38mm Outer / 32mm Inner Width, 45mm Profile, 390–470g

Bola 700C Offset Tubeless Carbon Road Rim — 38mm Outer / 32mm Inner Width, 45mm Profile

The Bola 700C carbon road rim is a tubeless-ready, asymmetric (offset) rim designed for 700C road and gravel wheelbuilds. With a 38mm outer width, 32mm inner width, and 45mm profile height, it is optimised for modern 28–32mm road tyres and delivers a balance of aerodynamic efficiency and lateral stiffness. Available in four weight tiers to match rider priorities from durability to weight-weenie climbing builds.

Key Specifications

Weight Tier Comparison

Select the weight scheme that aligns with your riding discipline and build requirements:

Trade-off note: Lighter schemes (Ultralight / Extreme Light) use reduced carbon layup. While they save 60–80g per rim versus Normal, they carry a tighter strength margin. For riders over 90kg or those riding rough road surfaces regularly, Superlight or Normal is recommended.

Structural Strength Data

• Forward Compressive Strength: >300kg
• Lateral Torsion Resistance: >50kg
• Spoke Hole Tension: >280kg

Why an Offset (Asymmetric) Rim?

On rear wheels, drive-side spoke bracing angles are shallower than non-drive-side due to cassette offset, resulting in uneven spoke tension. An offset rim shifts the spoke bed 2–3mm toward the drive side, equalising tension across both flanges. This reduces the risk of spoke fatigue failure and improves lateral stiffness — particularly relevant on wide rims (>30mm inner) paired with 11- or 12-speed drivetrains.

Tubeless Compatibility

The rim bed is tubeless-ready with a sealed profile compatible with standard tubeless tape and valves. The 32mm inner width accommodates 28–32mm road tubeless tyres at the recommended tyre-to-rim ratio. Minimum recommended tyre width: 28mm.

Customisation Options

• Spoke hole count: customisable on request
• Valve hole diameter: 6.5mm standard or customised
• Assembly hole diameter: 7.5mm standard or customised
• Nipple direction: configurable for front and rear specific builds

Frequently Asked Questions

Is a 32mm inner width rim good for endurance road cycling?

Yes. A 32mm inner width is well-suited to endurance road cycling when paired with 28–32mm tyres. The wider bed reduces tyre sidewall deformation, allowing lower inflation pressures (100–115psi range) for improved vibration damping without sacrificing rolling efficiency.

What is the difference between Superlight and Ultralight, and is it worth the extra cost?

The Superlight scheme weighs 445 ±15g and suits all-around road use. The Ultralight scheme at 410 ±10g saves approximately 35g per rim (70g per wheelset), which is meaningful for climbing builds. The Extreme Light at 390 ±10g saves a further 20g per rim. Whether the cost premium is justified depends on riding discipline — for flat or mixed terrain, the weight difference has minimal performance impact; for sustained climbs, every 50g per wheelset is measurable.

Should I use an offset rim for my road bike wheel build?

For rear wheels on bikes with 10-speed or wider drivetrains, an offset rim is beneficial as it equalises spoke tension between drive and non-drive sides. For front wheels, a standard (symmetric) rim is typically sufficient unless a specific hub flange geometry warrants it.

What weight scheme do I need for climbing versus all-around riding?

For dedicated climbing builds, the Ultralight (410g) or Extreme Light (390g) schemes minimise rotational weight. For all-around riding including training and varied terrain, the Superlight (445g) or Normal (470g) schemes offer better durability margins.

What tyre width is compatible with this rim?

The 32mm inner width is compatible with 28–45mm tyres. For road use, 28–32mm tubeless tyres are optimal. The ETRTO recommended tyre-to-inner-rim width ratio of 1.0–2.5x is satisfied across this range.