A 29-inch front and 27.5-inch rear setup can pair a rollover-friendly front wheel with a smaller rear wheel, but a wheelset listing alone does not confirm that it will fit your frame. I ranked these options by how directly they support the mixed-wheel goal, how clearly they state axle and drivetrain compatibility, and whether their features suit a particular rider. The ZTTO DR390 is my best overall pick because it is explicitly offered in a mixed size and lists wide, tubeless-compatible rims. The ZTTO DR390-Pro also offers a mixed configuration, but its non-Boost axle options make it a better match for some older frames. For e-bike use, the ZTTO P3E Pro has reinforced components, while the Ebsenopower kit is a different kind of product altogether: a powerful motor conversion that needs careful frame and system checks.
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These products are not interchangeable. Three ZTTO wheelsets are offered in mixed sizes; the BUCKLOS listing is for a 29-inch pair, and the Ebsenopower listing describes a rear motor wheel rather than a complete mullet wheelset. I would confirm the bike’s axle spacing, brake mount, cassette standard, tire clearance, and intended use before ordering any of them.
Complete the kit
Key Takeaways
- The ZTTO DR390 is the clearest all-around match because the listing offers a mixed 29/27.5-inch configuration and tubeless-compatible 30 mm internal rims.
- The DR390-Pro also lists mixed sizes, but its 15×100 mm front and 12×142 mm rear thru-axle options differ from the Boost standards on the DR390.
- The P3E Pro is the most purpose-built option here for e-MTB torque, with steel axles and a steel freehub; verify its exact axle and cassette fit.
- BUCKLOS lists only a 29-inch wheelset, so it does not directly provide the 29-front/27.5-rear combination without sourcing a separate rear wheel.
- Ebsenopower is a high-power rear motor conversion kit, not a conventional mullet wheelset, and its 155 mm dropout width and substantial mass limit fit and use.
| ZTTO DR390 Mountain Bike Wheelset, 27.5 or 29 Inch, 35 mm Wide, 36T Ratchet Hub |  | Best Overall for a Direct Mullet Build | Wheel sizes: 27.5 in, 29 in, or mixed 29/27.5 in | Rim: Aluminum alloy; 30 mm internal, 35 mm external; 21 mm depth | Hub: DR390, 36T ratchet, six pawls; 5-degree engagement | VIEW ON AMAZON | See Our Full Breakdown |
| ZTTO DR390-Pro 27.5/29-Inch MTB Wheelset with 36T Ratchet Hubs |  | Best for Non-Boost Axle Standards | Wheel sizes: 27.5 in, 29 in, or mixed 29/27.5 in | Rim: Aluminum alloy; 30 mm or 29.7 mm internal listing, 35 mm external; 21 mm depth | Hub: DR390-Pro, 36T ratchet, six pawls; 5-degree engagement | VIEW ON AMAZON | See Our Full Breakdown |
| ZTTO P3E Pro Boost Tubeless MTB E-Bike Wheelset, 27.5 or 29-Inch |  | Best for E-MTB Mullet Builds | Wheel sizes: 27.5 in, 29 in, or mixed 29/27.5 in | Rim: Aluminum; 35 mm external; internal width listed as 30 mm and 29.7 mm; 21 mm depth | Axles: Front 15×110 mm; rear 12×148 mm thru-axle or 10×141 mm QR | VIEW ON AMAZON | See Our Full Breakdown |
| BUCKLOS Boost Thru-Axle Mountain Bike Wheelset, 29-Inch |  | Best for a 29er Upgrade, Not a Complete Mullet Pair | Wheel size: 29 in | Rim: Aluminum alloy, 30 mm wide, double-wall | Axles: Front 15×110 mm Boost; rear 12×148 mm Boost | VIEW ON AMAZON | See Our Full Breakdown |
| Ebsenopower 48V–72V 5000W E-Bike Rear Wheel Kit with 100A Controller |  | Best for a High-Power Motor Conversion, Not a Trail Wheelset | Motor: 5000W rated at 72V | Voltage: 48V, 60V, or 72V | Wheel sizes: 24, 26, 27.5, 29 in, and 700C listed | VIEW ON AMAZON | See Our Full Breakdown |
| mullet conversion kit 29 front 275 rear | Wheel sizes | Rim | Spokes | Hub |
|---|---|---|---|---|
| ZTTO DR390 Mountain Bike Wheel | 27.5 in, 29 in, or mixed 29/27.5 in | Aluminum alloy; 30 mm internal, 35 mm external; 21 mm depth | 32-hole J-bend, 1.4–2.3 mm aero spokes | DR390, 36T ratchet, six pawls; 5-degree engagement |
| ZTTO DR390-Pro 27.5/29-Inch MT | 27.5 in, 29 in, or mixed 29/27.5 in | Aluminum alloy; 30 mm or 29.7 mm internal listing, 35 mm external; 21 mm depth | 32-hole J-bend, 1.4–2.3 mm aero spokes | DR390-Pro, 36T ratchet, six pawls; 5-degree engagement |
| ZTTO P3E Pro Boost Tubeless MT | 27.5 in, 29 in, or mixed 29/27.5 in | Aluminum; 35 mm external; internal width listed as 30 mm and 29.7 mm; 21 mm depth | 32-hole J-bend | Six pawls; 5-degree engagement; steel axles and freehub |
| BUCKLOS Boost Thru-Axle Mounta | — | Aluminum alloy, 30 mm wide, double-wall | 32 stainless steel spokes per wheel | — |
| Ebsenopower 48V–72V 5000W E-Bi | 24, 26, 27.5, 29 in, and 700C listed | — | — | — |
More Details on Our Top Picks
ZTTO DR390 Mountain Bike Wheelset, 27.5 or 29 Inch, 35 mm Wide, 36T Ratchet Hub
The DR390 earns the top spot because it is explicitly offered as a mixed 29/27.5-inch wheelset, so it most directly answers the title’s buying need. Its 30 mm internal rims give wider trail tires a supportive base, while tubeless compatibility lets riders set up without inner tubes if the rim tape and valves are supplied or purchased separately. The 36T ratchet hub is listed with 5-degree engagement, a useful detail for riders who value frequent pedal pickup on technical trails.
Compared with the DR390-Pro, this version lists Boost front and rear axle choices alongside a rear QR option, rather than the Pro’s 15×100 mm front and 12×142 mm rear standards. That makes it a stronger candidate for a modern Boost frame, but a poor match for a bike requiring the Pro’s non-Boost spacing. The listing says axle options vary by configuration, so I would confirm the exact mixed-size hub standards and cassette driver before buying. Rim tape is not confirmed as included, which can add setup work for a tubeless build.
Pros:- Explicit 29/27.5-inch mixed configuration is available.
- 30 mm internal, tubeless-compatible rims support wider trail tires.
- 36T ratchet hub lists 5-degree engagement.
- 32-hole J-bend spokes offer a conventional, serviceable layout.
Cons:- Axle standards vary by configuration and must match the bike.
- The listing does not say whether tubeless tape is included.
- Cassette standards are listed broadly as HG, XD, and MS, so the exact driver needs confirmation.
Best for: Riders with compatible Boost spacing who want a clearly listed mixed-size wheelset for trail riding and may want to run tubeless tires.
Not ideal for: Owners of non-Boost frames, or anyone who needs a confirmed included tubeless tape kit or a precisely documented driver configuration before ordering.
- Wheel sizes:27.5 in, 29 in, or mixed 29/27.5 in
- Rim:Aluminum alloy; 30 mm internal, 35 mm external; 21 mm depth
- Hub:DR390, 36T ratchet, six pawls; 5-degree engagement
- Spokes:32-hole J-bend, 1.4–2.3 mm aero spokes
- Brake:6-bolt disc
- Axles:Front 15×110 mm; rear 12×148 mm thru-axle or 10×141 mm QR, depending on setup
- Tires:Clincher with F/V tubes; tubeless compatible
- Cassette:HG, XD, and MS standards listed
Our verdict“I would start here for a compatible Boost bike because it combines an explicit mixed-size option with wide tubeless-ready rims, subject to checking the selected hub configuration.”
ZTTO DR390-Pro 27.5/29-Inch MTB Wheelset with 36T Ratchet Hubs
The DR390-Pro takes a distinct second place for riders whose frames use non-Boost spacing. It lists a 29/27.5-inch mixed option and offers 15×100 mm front and 12×142 mm rear thru-axle standards, plus quick-release alternatives. That makes it more relevant than the standard DR390 for certain older or non-Boost bikes, even though the standard DR390 has a clearer Boost-oriented fit story.
Its core trail package is similar: 30 mm internal aluminum rims, tubeless compatibility, 32-hole J-bend spokes, and 36T ratchet hubs with 5-degree engagement. The listing contains a small discrepancy, giving the internal width as both 30 mm and 29.7 mm, and it does not state wheelset weight. Those gaps matter for a buyer comparing builds or trying to confirm tire fit. I would ask the seller to confirm that the selected mixed-size pair has the axle spacing and freehub needed by my bike.
Pros:- Mixed 29/27.5-inch configuration is listed.
- Offers non-Boost thru-axle and QR options.
- Tubeless-compatible rims with a wide 30 mm listed internal width.
- 36T ratchet hubs list 5-degree engagement.
Cons:- Internal rim width is listed as both 30 mm and 29.7 mm.
- Wheelset weight is not specified.
- Exact axle and cassette configuration still needs confirmation.
Best for: Riders building a mullet setup on a non-Boost frame that matches the listed 100/142 mm thru-axle standards, or the corresponding QR options.
Not ideal for: Owners of Boost frames, weight-focused buyers, or riders who need unambiguous rim dimensions and confirmed wheelset mass.
- Wheel sizes:27.5 in, 29 in, or mixed 29/27.5 in
- Rim:Aluminum alloy; 30 mm or 29.7 mm internal listing, 35 mm external; 21 mm depth
- Hub:DR390-Pro, 36T ratchet, six pawls; 5-degree engagement
- Spokes:32-hole J-bend, 1.4–2.3 mm aero spokes
- Brake:6-bolt disc
- Front axle:15×100 mm thru-axle or 9×100 mm QR
- Rear axle:12×142 mm thru-axle or 10×135 mm QR
- Tires and cassette:Clincher and tubeless compatible; MTB cassettes
Our verdict“I would choose the DR390-Pro over the standard DR390 when the bike needs non-Boost spacing, while verifying the selected mixed configuration and dimensions first.”
ZTTO P3E Pro Boost Tubeless MTB E-Bike Wheelset, 27.5 or 29-Inch
The P3E Pro is the lineup’s clearest choice for an e-MTB-specific wheelset. It is offered in mixed 29/27.5-inch sizing and pairs aluminum rims with steel axles and a steel freehub, components the description says are intended to handle e-bike drivetrain torque. Its six-pawl hub lists 5-degree engagement, and the rims are tubeless-ready. For an e-bike rider, that added-duty focus makes it more suitable than the lighter-duty framing of the DR390 listings.
The tradeoff is that “Boost” in the name does not remove the need to verify the exact build: the listing gives a 15×110 mm front and either 12×148 mm rear thru-axle or 10×141 mm QR. It also describes the internal rim width as both 30 mm and 29.7 mm. Compared with the standard DR390, the P3E emphasizes reinforcement over a straightforward general trail choice, while providing less certainty in the dimensions. I would confirm cassette driver compatibility, wheel size pairing, and axle setup before ordering.
Pros:- Mixed 29/27.5-inch configuration is listed.
- Steel axles and steel freehub are aimed at e-bike torque demands.
- Tubeless-ready 30 mm-class rims suit wide trail tires.
- Six-pawl hub lists 5-degree engagement.
Cons:- Internal rim width is inconsistent across listing sections.
- Axle options require careful matching to the frame.
- Cassette compatibility is described generally as MTB cassettes.
Best for: E-MTB owners seeking a mixed wheel configuration with reinforced steel axles and freehub, provided their frame and cassette match the chosen setup.
Not ideal for: Riders with a conventional non-electric bike who do not need the reinforced parts, or anyone requiring exact, consistent rim specifications before purchase.
- Wheel sizes:27.5 in, 29 in, or mixed 29/27.5 in
- Rim:Aluminum; 35 mm external; internal width listed as 30 mm and 29.7 mm; 21 mm depth
- Axles:Front 15×110 mm; rear 12×148 mm thru-axle or 10×141 mm QR
- Hub:Six pawls; 5-degree engagement; steel axles and freehub
- Spokes:32-hole J-bend
- Brake:6-bolt disc
- Tires:Tubeless-ready
- Cassette:MTB cassettes
Our verdict“For a compatible e-MTB, I would favor the P3E over the standard DR390 for its reinforced hub parts, while treating the fit checks as mandatory.”
BUCKLOS Boost Thru-Axle Mountain Bike Wheelset, 29-Inch
BUCKLOS is a useful comparison point, but it is not a direct mullet conversion: the supplied description specifies a 29-inch wheelset rather than a mixed pair. It could suit a rider who already has a compatible 27.5-inch rear wheel or is sourcing a separate rear wheel independently. The construction includes double-wall aluminum rims, sealed bearings, and 32 stainless steel spokes per wheel, with Boost thru-axles at both ends.
That straightforward build may appeal to a rider prioritizing a familiar 29er replacement, but the specification lists a pair weight of 6.44 kg, a substantial figure to account for when comparing rotating mass. Its 8- to 11-speed cassette compatibility is more specific than the broad MTB wording on some other entries, though the actual freehub standard should still be verified. Unlike the DR390 options, it does not provide a stated 27.5-inch rear wheel, and no tubeless compatibility is included in the supplied details. I would pass if the goal is to order one complete mixed-size solution.
Pros:- Double-wall aluminum rims.
- Sealed bearings and 32 stainless steel spokes per wheel.
- 8- to 11-speed cassette compatibility is specified.
- Fits 1.8- to 3.0-inch tires, according to the listing.
Cons:- Only 29-inch sizing is specified, so it does not form a mullet pair by itself.
- Pair weight is listed as 6.44 kg.
- Tubeless compatibility is not specified in the supplied description.
Best for: Riders with Boost spacing who need a 29-inch wheelset and already have a compatible 27.5-inch rear wheel or plan to source one separately.
Not ideal for: Buyers seeking one complete 29-front/27.5-rear wheelset, or those prioritizing low stated wheelset weight or documented tubeless support.
- Wheel size:29 in
- Rim:Aluminum alloy, 30 mm wide, double-wall
- Axles:Front 15×110 mm Boost; rear 12×148 mm Boost
- Spokes:32 stainless steel spokes per wheel
- Bearings:Sealed
- Cassette:8- to 11-speed
- Tire range:1.8–3.0 in
- Weight and warranty:6.44 kg per pair listed; 1-year warranty
Our verdict“I would consider BUCKLOS only when a 29-inch Boost wheel is the missing piece of a build and the 27.5-inch rear wheel is handled separately.”
Ebsenopower 48V–72V 5000W E-Bike Rear Wheel Kit with 100A Controller
Ebsenopower sits last for this roundup because it is a powered rear-wheel conversion kit, not a matched mullet wheelset. It includes an MTX39 motor wheel, controller, display, throttle, hydraulic brake, alarm, and pedal-assist sensor. Its size list includes both 29 and 27.5 inches, but that does not mean the package supplies a front 29-inch wheel and rear 27.5-inch wheel. Buyers would need to source the front wheel separately and verify that the rear motor wheel fits the frame.
This option is aimed at a different project from the DR390 or P3E: converting a compatible bicycle to a high-power hub-motor setup. The listing gives a 155 mm dropout width, up to 143 N·m torque, and a 100A controller, while wheel weight appears as both 10.3 kg and 12 kg. Those numbers and the missing tire and tube make compatibility and installation planning especially important. I would only consider it when a motorized build is the actual goal; for a conventional mullet trail bike, the standard wheelsets are far more relevant.
Pros:- Includes a rear hub motor wheel and several control components.
- Supports listed 48V, 60V, and 72V systems.
- Motor specification lists up to 143 N·m torque.
- Wheel size options include 27.5 and 29 inches.
Cons:- It is a rear motor kit, not a complete mullet wheelset.
- 155 mm dropout width and electrical requirements sharply limit fit.
- Tire and tube are not included.
- Wheel weight is inconsistent across listing sections.
Best for: Experienced builders planning a compatible high-power e-bike conversion who can confirm dropout fit, electrical system requirements, and wheel size.
Not ideal for: Riders seeking a conventional, ready-to-fit 29-front/27.5-rear mountain bike wheelset or a lightweight trail setup.
- Motor:5000W rated at 72V
- Voltage:48V, 60V, or 72V
- Wheel sizes:24, 26, 27.5, 29 in, and 700C listed
- Dropout width:155 mm
- Torque and speed:143 N·m maximum torque; about 860 RPM maximum speed
- Controller:100A maximum DC current; 250A maximum phase current
- Included components:Rear wheel, controller, display, throttle, hydraulic brake, alarm, and pedal-assist sensor
- Tire and weight:Tire and tube not included; wheel listed as 10.3 kg and 12 kg
Our verdict“I would buy this only for a deliberate motor conversion with a confirmed compatible frame and system, not as a straightforward mullet wheel upgrade.”
How We Picked
I ranked these five listings around one specific question: how readily can a buyer build a 29-inch front, 27.5-inch rear setup from the product described? I gave priority to explicit mixed-size availability, then compared the compatibility information, wheel construction, tubeless support, and intended riding use. A wide rim or fast-engaging hub can be useful, but those details matter only after the wheel matches the bike.
I also treated product category as part of the ranking. A conventional wheelset, an e-bike-oriented wheelset, a 29-inch-only pair, and a hub motor kit serve different jobs. The motor kit is included because it is in the supplied lineup, though it does not meet the same need as a two-wheel mullet conversion. I used the provided product descriptions and specifications; I do not claim to have installed or ridden these products. Where the listing gives conflicting or incomplete details, I call that out so buyers know what to verify.
| mullet conversion kit 29 front 275 rear | Rim | Hub | Axles |
|---|---|---|---|
| ZTTO DR390 Mountain Bike Wheel | Aluminum alloy; 30 mm internal, 35 mm external; 21 mm depth | DR390, 36T ratchet, six pawls; 5-degree engagement | Front 15×110 mm; rear 12×148 mm thru-axle or 10×141 mm QR, depending on setup |
| ZTTO DR390-Pro 27.5/29-Inch MT | Aluminum alloy; 30 mm or 29.7 mm internal listing, 35 mm external; 21 mm depth | DR390-Pro, 36T ratchet, six pawls; 5-degree engagement | — |
| ZTTO P3E Pro Boost Tubeless MT | Aluminum; 35 mm external; internal width listed as 30 mm and 29.7 mm; 21 mm depth | Six pawls; 5-degree engagement; steel axles and freehub | Front 15×110 mm; rear 12×148 mm thru-axle or 10×141 mm QR |
| BUCKLOS Boost Thru-Axle Mounta | Aluminum alloy, 30 mm wide, double-wall | — | Front 15×110 mm Boost; rear 12×148 mm Boost |
| Ebsenopower 48V–72V 5000W E-Bi | — | — | — |
Factors to Consider When Choosing Mullet Conversion Kit 29 Front 275 Rear
For a 29-front/27.5-rear build, I would treat fit as the first filter and riding features as the next one. The mixed-size label solves only the wheel diameter question; it does not confirm axle spacing, brake fit, cassette driver, tire clearance, or whether a wheel is appropriate for the bike’s use.
Confirm the actual mixed configuration
Check that the selected product configuration is specifically 29 inches front and 27.5 inches rear. A listing that offers 29-inch, 27.5-inch, and mixed sizes may require choosing the mixed option separately. BUCKLOS lists a 29-inch pair, while Ebsenopower lists several motor wheel sizes; neither description establishes a complete 29/27.5 wheelset.
Match axle spacing and frame standards
Read the frame and fork markings or manufacturer documentation before ordering. The DR390 lists 15×110 mm Boost front spacing and several rear options, while the DR390-Pro lists 15×100 mm and 12×142 mm thru-axle standards or QR alternatives. These standards are not interchangeable. A wheel can have the right diameter and still be unusable if the hub spacing or axle type is wrong.
Check the cassette and brake interfaces
Confirm the freehub body matches the cassette you plan to install: the DR390 names HG, XD, and MS options, the DR390-Pro says MTB cassettes, and the P3E and BUCKLOS descriptions give broader or speed-based compatibility. Also check the 6-bolt rotor mount where specified and confirm rotor size and caliper clearance. A cassette or rotor mismatch may require extra parts or make the wheel incompatible.
Choose rims and tires for your riding
The ZTTO rims are listed at about 30 mm internal width and tubeless compatible or ready, which supports wider tires and can help maintain tire shape at lower pressures. Confirm the tire maker’s approved rim-width range and whether tape and valves are included. The DR390-Pro and P3E have minor internal-width discrepancies in their listings, so ask for clarification if tire fit depends on an exact measurement.
Separate trail wheels from motor conversions
For a conventional trail mullet setup, the DR390 and DR390-Pro are the more direct options; the P3E adds e-MTB-oriented reinforcement. Ebsenopower is a motor kit with a 155 mm dropout specification, electrical requirements, and a heavy rear wheel. Its inclusion of 27.5- and 29-inch sizes does not make it a complete mixed-wheel trail set. Decide whether you want a wheel upgrade or a motor conversion before comparing the details.
Frequently Asked Questions
What does 29 front, 27.5 rear mean?
It describes a mixed-wheel setup with a 29-inch front wheel and 27.5-inch rear wheel. Riders may choose this layout to retain a larger front wheel’s rollover character while using a smaller rear wheel, but the result depends on frame design, geometry, and components. The wheel diameters alone do not establish compatibility.
Which product here is the most direct mullet conversion option?
The ZTTO DR390 is my best overall pick because its listing explicitly offers a mixed 29/27.5-inch configuration and gives useful rim, hub, and axle details. The DR390-Pro and P3E Pro also list mixed sizes, but each has fit details to verify. BUCKLOS is described as a 29-inch pair, and Ebsenopower is a rear motor kit.
Can I use any 29-inch front wheel with a 27.5-inch rear wheel?
No. You need to match the front and rear axle standards, hub spacing, brakes, cassette, and tire clearance to the bike. Frame geometry and manufacturer guidance also matter when changing wheel diameter. Check the actual selected configuration and your bike’s documentation rather than relying on diameter alone.
Are these wheelsets tubeless-ready?
The DR390 is described as tubeless compatible, the P3E Pro as tubeless-ready, and the DR390-Pro as compatible with clincher and tubeless use. BUCKLOS’ supplied description does not specify tubeless compatibility. Even where support is listed, verify whether rim tape and valves are included and use tires approved for your rim.
Is the Ebsenopower kit a suitable mullet wheelset?
It is not a conventional two-wheel mullet set. Ebsenopower describes a rear hub motor wheel and electrical components, with several wheel sizes listed, but no matching 29-inch front wheel. Its 155 mm dropout width and system requirements also call for careful compatibility checks. It makes sense for a motor conversion project rather than a simple trail wheel change.
Conclusion
For most riders with a compatible Boost bike, I recommend starting with the ZTTO DR390 because it directly lists a mixed wheel configuration and pairs it with wide, tubeless-compatible rims. Choose the DR390-Pro if your frame needs its non-Boost axle standards, and the P3E Pro if you are building an e-MTB and want its reinforced axle and freehub design. The BUCKLOS suits someone who needs a 29-inch pair and will source a 27.5-inch rear separately. I would reserve Ebsenopower for a high-power motor conversion. Before ordering, match the exact mixed sizes, axle standards, cassette driver, brake mount, and tire clearance to your bike.
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