700C 38mm Carbon Rims

Bola 700C 38mm external width asymmetric carbon rims are built with a massive 32mm internal width for extreme gravel, bikepacking, and cross-country mountain bikes. The asymmetric spoke bed balances drive-side and non-drive-side spoke tension for a stronger, stiffer, and more durable wheel build. Depth External / Internal Width Tire Compatibility Profile Target Weight 45mm 38mm / 32mm 40c–60c / 2.1"–2.4" Asymmetric Tubeless ~450g (Flyweight) / ~490g (Standard) 50mm 38mm / 32mm 40c–60c / 2.1"–2.4" Asymmetric Tubeless ~470g (Flyweight) / ~510g (Standard) Material: Toray T700/T800/T1000 composite carbon fiber Profile: Asymmetric offset design for balanced spoke tension Brake Compatibility: Disc brake only Tire Interface: Tubeless Ready hooked and hookless profiles Warranty & Service: 3-year warranty, 30% crash replacement, and free DDP shipping

38mm external width, 32mm internal – built for the rough stuff

The 38mm external / 32mm internal rim profile is Bola's widest carbon rim bed, designed for extreme gravel, bikepacking, cross-country and heavy-tire applications where air volume, impact resistance and traction matter more than pure aero. The asymmetric spoke bed repositions the spoke holes toward the rim centerline, balancing drive-side and non-drive-side spoke tension so the wheel stays true under hard torque loads.

Key specifications

  • Internal width: 32mm – accepts high-volume gravel and MTB tires with a stable, wide footprint.
  • Asymmetric drilling: stronger wheel build and reduced tension differential between drive and non-drive sides.
  • Tubeless-ready hookless or hooked options: set up tubeless in minutes with Bola rim tape included.
  • Toray carbon layup: same high-modulus fiber used across the Bola rims range.

Which Bola rims sit in this collection

This collection groups the 700C 50mm asymmetric carbon rim (38/32mm wide) and the 700C 45mm tubeless asymmetric rim (32mm wide), giving you the depth and width combination for gravel speed or loaded bikepacking. Pair them with the matching Bola spoke kits and hubs, or order as a complete built wheel. Sizing note: 32mm internal rims pair best with 38c to 2.2-inch tires; check your frame clearance before ordering.

Custom Build Inquiry

Click to submit specific requirements