Mid-Drive Conversion Kit Fitment: Will a 2000W Kit Fit Your Bike?

Before you buy a mid drive ebike kit, the first question is not how much power you want. It is whether your frame can take it. A mid-drive replaces your bottom bracket and drives the crank, so it asks more of your frame than a hub motor does. This guide is a fitment checklist for the High Performance Mid Drive Conversion Kit, HPC's 2000W mid-drive system, so you can find out whether your bike is a good candidate before you order. If you want the step-by-step build, see our 2000W mid-drive conversion kit build guide. This post stays on compatibility.

What is in the kit?

Fitment depends on what physically bolts to your bike, so here is what the product page lists. The kit is priced at $1,950 and includes:

• 2000W mid-drive motor and bottom bracket assembly with an integrated, sealed controller (about 12 lb)
• HPC 48V 17.5Ah USA-made NMC battery system with charger, with your choice of a hard-case battery or a frame bag system
• Intelligent LCD screen with power button and assist level selector
• Left and right crank arms
• 42T narrow-wide chainring
• Left and right brake levers with motor cutoff
• Universal thumb throttle, wiring harness and mounting hardware

It comes with a 3-year limited warranty. Because the motor, battery, display and controller arrive as one matched system, most of your fitment questions come down to the frame and the drivetrain.

Step 1: Measure your bottom bracket shell

This is the most important check. According to the product page, the kit fits the most common bottom bracket sizes: 68 mm to 73 mm, 100 mm, and 120 mm (fat bike). Other sizes can be made to fit with custom spacers.

Measure the width of the shell on your frame, not the width of the cranks, and write the number down. HPC asks you to enter your bottom bracket size in the order notes, so they can prepare the kit to suit. If you are not sure what you are looking at, take a clear photo and contact the team before you order.

Step 2: Check the frame around the motor

A mid-drive motor is a solid block sitting right where your frame is busiest. Before ordering, look at the area around the bottom bracket and ask:

• Chainstay and seat tube clearance. The motor housing needs room around the shell. Look for chainstays that sweep in close, a tight seat tube, or a front derailleur mount that could be in the way.
• Frame material and condition. A 2000W system puts real torque through the bottom bracket area. Use a sound frame with no cracks or old repairs around the shell.
• Suspension pivots. On a full-suspension frame, check that nothing, such as a pivot, linkage or shock, sits within reach of the motor housing.
• Cable and brake routing. Confirm there is room to route the motor wiring neatly away from the chain and cranks.

Frames designed for mid-drive systems are the easiest. Bikes with unusual bottom bracket areas should be checked with HPC before ordering.

Step 3: Think about chainline and drivetrain

The kit drives a single-speed 42T narrow-wide chainring, so your chain needs to run in a straight line from that ring to your rear cog or cassette. Things to check:

• Rear gearing. The product page quotes its torque figure using a 42T chainring and a 46T cassette, so a wide-range rear cassette is part of how this kit is meant to be used.
• Chain and cassette condition. A worn chain on a new 2000W system will skip and stretch quickly. Plan on a fresh chain and check the cassette teeth.
• Chain strength. High torque is hard on drivetrains. Our guide to the steel narrow-wide chainring for high-torque e-bikes explains why strong drivetrain parts matter.
• Cranks. The kit includes left and right crank arms, so your old cranks come off.

Step 4: Find room for the battery

The kit includes a 48V 17.5Ah USA-made battery with your choice of a hard-case battery or a frame bag system. That choice is a fitment decision too.

• Hard case: needs a mounting location, typically on the frame, with enough space and bolt-on points. Measure your main triangle.
• Frame bag: works well on frames with open space inside the main triangle, and avoids drilling or bolt-on points.

The pack connects with an XT90 connector, so plan where the wiring will run from the battery to the motor.

Step 5: Check the brakes, tires and rider use

Fitment is not only about bolting parts on. A bike with 2000W of mid-drive power is a different machine from the one you started with.

• Brakes. The kit includes brake levers with a motor cutoff. Your bike still needs brakes that can handle the added speed and weight. Hydraulic disc brakes are the sensible baseline.
• Tires and wheels. Check that your wheels and tires suit the added torque.
• Speed and range. HPC lists 34+ mph top speed and 40+ miles of maximum range, measured on a full battery with a 170 lb rider on flat ground (two-way average for speed, no wind for range). Your results will vary with weight, terrain and gearing.

A quick compatibility checklist

1. Measure the bottom bracket shell: 68 to 73 mm, 100 mm or 120 mm is a standard fit.
2. Look for clearance around the shell, chainstays, seat tube and any pivots.
3. Confirm the frame is solid and suited to mid-drive torque.
4. Check your chainline and rear cassette, and replace a worn chain.
5. Decide between the hard-case battery and the frame bag, and measure the space.
6. Make sure your brakes and tires match the new power level.
7. Put your bottom bracket size in the order notes.

What about the controller?

This kit uses an integrated, sealed controller built into the motor assembly, so there is nothing separate to mount. If you are planning a different build with a separate motor and external controller instead, HPC's current controller for new builds is the Nucular X6F. For how controllers differ, read E-Bike Controllers Explained.

Mid-drive or hub motor?

If your frame does not suit a mid-drive, a hub motor may be the easier route. Our conversion kit comparison walks through the trade-offs between hub, mid-drive and controller upgrades, and you can browse the full range of e-bike conversion kits.

Before you ride

With a top speed above 28 mph, a build like this goes beyond the typical legal definition of an electric bicycle in many places. Treat it as a machine for private land and off-road use, wear proper protective gear, and check your local rules before riding anywhere public.

Shop the High Performance Mid Drive Conversion Kit