# 29er Carbon MTB Rim – 36mm Outer / 30mm Inner Wide, Wave Profile, 20mm & 25mm, 28-Spoke, 300–380g | Bola ## 29er Carbon MTB Rim – Wave Profile, 30mm Inner Wide (Bola) The Bola 29er carbon MTB rim delivers a 36mm outer / 30mm inner width with a proprietary wave (wavy) profile in 20mm and 25mm heights, tuned for 28-spoke lacing. Four weight tiers — 380g, 350g, 325g, and 300g — let riders match rim mass to discipline without changing geometry or spoke count. ## Specifications Parameter Value Rim Diameter 29er (ISO 622mm) Outer Width 36mm Inner Width 30mm Profile Heights 20mm / 25mm (wave profile) Spoke Count 28H ERD 589mm Valve Hole Dia. 6.5mm (customisable) Spoke Hole Dia. 4.5mm (customisable) Assembly Hole Dia. 7.5mm (customisable) Nipple Direction Front 7°, Rear 5° & 7° (customisable) Min / Max Tyre Pressure 45 / 65 psi Max Rider Weight 120 kg Flatness Tolerance <0.15mm Roundness Tolerance <0.3mm Dynamic Balance <3g ## Weight Tiers Grade Weight per Rim Best For Standard 380 ± 15g All-mountain / enduro, prioritises durability Superlight 350 ± 10g Trail riding, balanced weight–strength Ultralight 325 ± 10g XC racing, marginal gains over durability Extreme Light 300 ± 10g Competitive XC, lightest option; tighter rider-weight ceiling recommended ## Structural Strength Data - **Forward Compressive Strength:** >300 kg - **Lateral Torsion Resistance:** >50 kg - **Spoke Hole Tension:** >280 kg _Tradeoff note:_ Moving from the 380g Standard tier to the 300g Extreme Light tier reduces rim mass by ~21% but narrows the safety margin for aggressive rock-garden impacts. Riders over 90 kg or running tubeless at the pressure ceiling (65 psi) are advised to select the Standard or Superlight grade. ## Profile Selection Guide - **20mm wave profile:** Lower aerodynamic drag, lighter feel — suited to cross-country (XC) and marathon racing where rolling resistance and acceleration matter most. - **25mm wave profile:** Marginally stiffer lateral platform — better suited to trail and light enduro where cornering precision is prioritised over outright weight. ## Compatibility - Tyre compatibility: 2.0–2.6 inch MTB tyres (tubeless-ready with 30mm inner width) - Spoke lacing: 28-hole; compatible with standard J-bend and straight-pull spokes at 4.5mm spoke hole diameter - Valve: Presta (6.5mm hole); Schrader adapter not compatible without re-drilling ## Frequently Asked Questions **Is a 30mm inner wide carbon rim better for aggressive MTB riding than standard width?** Yes. A 30mm inner width seats tyres 2.2–2.6 inch in a wider, rounder profile, improving cornering traction and reducing pinch-flat risk versus a 25mm inner width rim. It meets ETRTO recommendations for modern 29er MTB tyres sized 2.35 and above. **What is the lightest 29er carbon MTB rim available in this range?** The Extreme Light grade weighs 300 ± 10g per rim. At 290g minimum, it is among the lightest production carbon 29er rims at 36mm outer width. Note the tighter tolerance and the rider-weight guideline of <120 kg applies to all grades. **Should I choose the 20mm or 25mm profile for cross-country versus enduro?** Choose the 20mm profile for XC and marathon — lower profile reduces weight and aerodynamic drag at speed. Choose the 25mm profile for trail and enduro — the taller sidewall adds lateral stiffness under cornering loads. **What are the strength and weight tradeoffs between ultralight and standard carbon MTB rims?** The Standard grade (380g) maintains full structural margins across all three strength metrics. Each lighter tier reduces wall thickness incrementally; forward compressive and spoke tension figures remain >300 kg and >280 kg respectively across all grades per Bola's internal testing, but real-world impact resistance decreases as mass drops. **Can this rim be set up tubeless?** Yes. The 30mm inner width and 4.5mm spoke holes are compatible with standard tubeless tape and valves. Apply at least two full wraps of 33mm tubeless tape to ensure an airtight seal before installing a tubeless valve. ## Details - **Price:** 320.0 USD - 340.0 USD - **Type:** Mountain Bike Rim - **Tags:** 28 spoke MTB rim, 29er carbon rim, 30mm inner wide rim, Bola carbon rim, carbon bike rim, carbon MTB rim, enduro carbon rim, mtb, rims, tubeless ready carbon rim, ultralight MTB rim, wave profile rim, XC carbon rim ## Variants | Variant | Price | Available | |---------|-------|-----------| | UD Matt / Standard | 320.00 USD | In stock | | UD Matt / Superlight | 330.00 USD | In stock | | UD Matt / Ultralight | 340.00 USD | In stock | | UD Glossy / Standard | 320.00 USD | In stock | | UD Glossy / Superlight | 330.00 USD | In stock | | UD Glossy / Ultralight | 340.00 USD | In stock | | Marble Matt / Standard | 330.00 USD | In stock | | Marble Matt / Superlight | 330.00 USD | In stock | | Marble Matt / Ultralight | 330.00 USD | In stock | | Marble Glossy / Standard | 320.00 USD | In stock | | Marble Glossy / Superlight | 330.00 USD | In stock | | Marble Glossy / Ultralight | 340.00 USD | In stock | ## Images - 29er Carbon MTB Rim by Bola, featuring a wide wave profile, 36mm outer, 30mm inner width, and 28-spoke design. - 29er Carbon MTB Rim illustration showing dimensions: 36mm outer width, 30mm inner width, wave profile, 20mm & 25mm depths, 28 - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - 29er Carbon MTB Rim with a wave profile, 36mm outer width, 30mm inner width, designed for 28 spokes, weighing 300–380g. - 29er Carbon MTB Rim featuring a 36mm outer and 30mm inner width, wave profile, designed for 20mm & 25mm setups, 28-spoke. - 29er Carbon MTB Rim – 36mm Outer / 30mm Inner Wide, Wave Profile, 20mm & 25mm, 28-Spoke, 300–380g | Bola Carbon Fiber Sporting Goods - 29er Carbon MTB Rim – 36mm Outer / 30mm Inner Wide, Wave Profile, 20mm & 25mm, 28-Spoke, 300–380g | Bola Carbon Fiber Sporting Goods ## Additional Information - **Product rating count:** 1 - **Related products settings:** ahead --- > Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/29er-carbon-mtb-rim-36mm-outer-30mm-inner-wide-wave-profile-20mm-25mm-28-spoke-300-380g-bola) > Updated: 2026-07-31