BOLA 700c 30mm Asymmetric Carbon Rear Disc Wheel | Center Lock, 12x142mm
BOLA 700c 30mm Asymmetric Carbon Rear Disc Wheel | Center Lock, 12x142mm
Regular price
$850.00 USD
Regular price
$900.00 USD
Sale price
$850.00 USD
Free shipping | VAT included in EU & USA
Quantity
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The Bola 700C 30mm asymmetric carbon rear disc wheel - a solid rear TT/triathlon disc wheel, 30mm external / 25mm internal, with a 36T ratchet hub and 12x142 axle.
A solid wall against the wind - the rear disc wheel of the triathlete's dreams, built to hold speed where a spoked wheel simply cannot.
Buying Guide.
Use case: a flat-course TT and triathlon rear specialist - run it where the road runs straight and sustained speed beats light weight.
Front pairing: pair it with a Bola 3- or 5-spoke aero front rather than a deep 88mm front, so a gusty day stays manageable.
Tyre choice: stick to 28-32mm rubber (30-35mm for the best mix of speed and comfort) on the narrow internal bed.
Course judgement: it rewards wind-protected, flat events; it adds rotating mass on rolling or hilly terrain.
Same-position comparison: the CLA 60/88mm triathlon wheelset ($618) is a complete spoked alternative if you want a single purchase.
Rear wheel only; verify frame clearance for a solid disc before ordering.
Target Audience & Usage Notes.
triathletes, time trialists and Ironman racers.
Rear wheel only; disc brake, 12x142 or 135 QR, Shimano HG freehub (select XDR if needed).
Check frame clearance for a solid disc.
Weight and max rider weight per spec table.
The Ride That Awaits.
On a flat TT start line the disc spins up smooth as silk, then falls silent behind you - a solid wall that dares the wind to try harder.
Draft yourself, hold the aero line, and let nothing steal your watt.
Free shipping and a 2-year wheelset warranty bring race-day peace of mind.
Specifications
Size: 700c
Carbon Grade: Toray
Rim Depth: N/A
Bead Type: Hooked
Inner Rim Width: 25mm
Outer Rim Width: 30mm
Hub Model: BL 300 36T
Spoke: N/A
Bearing Type: Enduro Steel bearing
Complete Wheelset Weight: 1200g (tape & valve excluded, ±2% tolerance)
Accessories: N/A
Trade-offs & Considerations
Aero vs Crosswind: As a solid rear disc, this wheel eliminates spoke drag on the rear for a large steady-state aero gain in time trials — about 7.0W versus a 50mm spoked rear at 40km/h — but at 10° yaw the solid disc can be pushed sideways in crosswinds, so it is fastest on sheltered, straight courses.
Weight vs Stiffness: At 1200g it is about 200g heavier than a typical 50mm spoked rear, but the solid shell removes spoke aero turbulence and delivers very high lateral stiffness for out-of-saddle time trial efforts.
Tire-Type Trade-off: The hooked 19mm internal bed accepts clincher and tubeless tyres from 25c to 30c; tubeless allows lower pressure and fewer flats, but needs tape, valve and sealant to seal the bed.
Sourcing & Delivery Trade-off: Stock rear-disc builds ship in 1–3 business days at $790; custom freehub or decals add 7–15 business days.
Config Ladder: The BL 300 36T ratchet runs Enduro steel bearings and gives 10° of engagement; a ceramic bearing upgrade would cut about 1.0W of hub friction but is not offered on this dedicated solid rear, and the 12x142mm Center Lock spacing is fixed, so there is no hub-swap ladder.
Performance Test Data
Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
Impact Resistance: >60J (Higher than ISO 4210-7)
Flatness: <0.25mm (internal QC)
Roundness: <0.3mm (internal QC)
Max Spoke Tension: >350 kgf (internal QC, spoke breaking tension)
Ultimate Strength: >50 kgf (internal QC, static spoke-hole point load)
Dynamic Equilibrium: <3g (internal QC)
Radial Stiffness: 90–110 N/mm (internal lab)
Lateral Stiffness: 48-60 N/mm
Max System Weight: 120kg (rider+bike+gear)
Recommended Use Cases
Time Trial / Triathlon Rear: Built as a single rear aero wheel at 1200g with a 36T ratchet hub (10 degrees engagement) and Enduro steel bearings, it pairs with your chosen front against the clock.
Road Race Rear Upgrade: The asymmetric rear bed balances spoke tension for disc braking; the 25mm internal tubeless bed runs 28-35c tyres (28-30c race-day, 25c supported) for low rolling resistance.
Center Lock Disc Setup: The 12x142mm Center Lock rear hub mounts modern disc road and tri frames; certified to ISO 4210 for long-distance triathlon use.
Not Recommended For: Off-road, gravel or touring - it is a road-optimised rear wheel, and a deep rear on very windy open courses should be planned around forecast.
Compatibility
Frame Compatibility: Fits frames with 12x142mm thru-axle or 135mm quick release rear spacing
Tire Type: Tubeless, clincher, tubular
Tire Width Range: 25-30mm
Brake Standard: Center Lock disc
Axle Standard: 12x142mm
Drivetrain: Shimano/SRAM (HG) compatible
Rotor Standard: Center Lock
How It Compares
| Model | Hub | Spoke | Bearing | Weight | Depth | Width | Price |
|---|---|---|---|---|---|---|---|
| 700C Rear 30mm | 36T ratchet, 10° engagement | N/A | Steel | 1200g | N/A | 26mm | See store |
| Model A (adapted reference) | 66T ratchet, 5.5° engagement | Sapim CX-Ray | Steel cartridge | ~1345g | 40mm | N/A | $2,400 |
| Model B (adapted reference) | 36T ratchet, 10° engagement | Bladed | Ceramic | ~1455g | 40mm | N/A | $1,166 |
| Model C (adapted reference) | 36T ratchet, 10° engagement | Bladed | Steel | ~1450g | 38mm | N/A | $499 |
FAQ
Will it fit my Shimano groupset — which freehub comes fitted?
It comes fitted with a Shimano HG freehub, so it works straight out of the box with Shimano road cassettes.
Can I run standard clincher tyres, or do I need a hookless-specific tyre?
The rim is hooked, so standard clincher tyres fit directly; for tubeless setups the hooked bed seals reliably.
How does a solid rear disc behave in crosswinds on exposed courses?
The rear disc is less wind-sensitive than the front end, so it tracks well on sheltered time trials; on gusty open courses pair it with a Bola 3- or 5-spoke aero front and hold the aero line.
Is this a rear wheel only for time-trial and triathlon?
Yes — it's the solid rear disc wheel built for time-trial and triathlon, and pairs with an aero front wheel.
Will I really pay no customs or VAT for delivery to the US and EU?
Yes. The Economy channel ships DDP — duties and VAT are fully prepaid by us, cleared in advance, and delivered to your door with no extra payment to customs or the courier.
Warranty & Shipping
Warranty Period: 2 years
Crash Replacement: 30% discount on replacement parts within 1 year of the original purchase date
Processing Time: In stock: 1–3 business days · Out of stock or custom order: 7–15 business days
Shipping method: FedEx/UPS/DPD/EMS Economy (free with duties & VAT included in USA & EU) · Expedited option available
Estimated Delivery: Economy 7–20 business days · Expedited 3–7 business days, customs clearance excluded
