Choosing the right ebike conversion kit starts with one critical step: knowing your wheel size. If you’re riding a road or hybrid bike, chances are you’ve got a 700c bike wheel a common standard that’s perfect for electric conversions.
But what does 700c really mean, and how do you measure it properly in inches? In this guide, we’ll explain exactly how to measure a 700c bike wheel in inches, why it matters for compatibility, and how to ensure a perfect fit with KirbEbike’s 250W Front Motor Kit.
Get your tape measure ready — let’s make sure your next ride is powerful, smooth, and sized just right.
What Is a 700c Bike Wheel (and What Size Is It in Inches)?
The term “700c bike wheel” often confuses new riders, especially when trying to match it with an ebike conversion kit. Despite sounding technical, it’s quite simple once you break it down.
700c = 29 Inches (Roughly)
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The “700” refers to the outer diameter of the tire in millimetres.
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The “c” is an old French system that once referred to tire width.
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In today’s terms, a 700c bike wheel is roughly equivalent to 29 inches in diameter when fully inflated with a standard road tire.
In inches:
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700c wheel = ~29 inches (outer diameter)
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Rim diameter (without tire) = ~622mm / 24.5 inches
Common Bikes That Use 700c Wheels
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Road bikes
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Hybrid bikes
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Gravel bikes
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Cyclocross bikes
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Touring bikes
If you ride one of these and are considering an ebike conversion, the KirbEbike 250W front motor kit for 700c wheels is a perfect match.
How to Measure Your 700c Bike Wheel (Step-by-Step)
Even if your bike says “700c,” it’s smart to measure it manually — especially before ordering an ebike conversion kit. Here’s how to do it accurately with just a tape measure.
What You’ll Need:
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A standard measuring tape (in inches or millimetres)
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Your bike on level ground
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A notebook (optional) to jot down your measurements
Step-by-Step Guide
Step 1: Measure the Diameter (With Tyre)
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Place your bike upright.
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Measure from the ground to the top of the tire (through the wheel’s centre).
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Result: This should be approximately 27.5 to 29 inches, confirming it’s a 700c wheel.
Step 2: Measure Rim Diameter (Without Tyre)
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If you can, remove the tire or measure from the rim edge to rim edge through the hub.
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A standard 700c rim is 622mm, or about 24.5 inches — this matches KirbEbike sizing.
Step 3: Check Axle Width
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Most KirbEbike front motor wheels are built for 100mm fork spacing — standard on 700c bikes.
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Measure the distance between your front fork dropouts.
Step 4: Identify Brake Type
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KirbEbike's 250W front motor kit supports both V-brakes and disc brakes, but it’s still good to confirm your bike’s setup.
Still Unsure?
If your measurement confirms a 700c / ~29" wheel with 100mm spacing, then you’re ready to ride with a KirbEbike 700c ebike conversion kit.
Why the KirbEbike 250W Kit Is Perfect for 700c Bikes
Once you've confirmed that you’re riding a 700c bike wheel, choosing a conversion kit becomes much easier. If your goals include daily commuting, legal compliance, or lightweight performance, the KirbEbike 250W Front Motor Kit offers everything you need and more.
Key Benefits for 700c Riders
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Feature
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Benefit for 700c Riders
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250W brushless gear motor
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Legal for UK roads and powerful enough for daily commutes
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36V 13Ah lithium battery
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35–45km range — ideal for urban travel and fitness rides
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Max speed of 25–30km/h
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Meets UK and EU legal limits for road use
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Lightweight (2.7kg motor)
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Keeps your road or hybrid bike agile and easy to handle
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V-brake & disc brake support
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Compatible with most 700c setups (hybrid, touring, road)
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Easy 20-minute installation
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No advanced tools or bike shop visit required
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Perfect Fit for These Bike Types
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Commuter Road Bikes
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Hybrid Fitness Bikes
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Touring Bicycles
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Urban Gravel Setups
Whether you're upgrading for performance, fitness, or convenience, the KirbEbike 250W kit transforms your 700c bike into a smooth, electric-powered ride in under 30 minutes.
Ready to Convert Your 700c Bike?
Now that you understand how to measure your 700c bike wheel and why it's crucial for choosing the right ebike conversion kit, you're one step closer to transforming your ride into an efficient, eco-friendly, and road-ready e-bike.
Why KirbEbike is the Best Choice for 700c Riders
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Perfectly sized 250W front motor kits available in 700C
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Backed by free UK shipping, 1-year warranty, and fast delivery
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Compatible with most road, hybrid, touring, and commuter bikes
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Lightweight, legal for UK roads, and built for daily use
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Powered by trusted lithium batteries for 35–45km per charge
Whether you're commuting to work, cruising city streets, or just want to give your favourite bike a powerful upgrade, KirbEbike makes it simple, affordable, and safe.
Common Mistakes to Avoid When Measuring Your 700c Wheel
While measuring your 700c bike wheel sounds straightforward, a few common mistakes can lead to ordering the wrong ebike conversion kit which means delays, returns, and frustration. Here's how to avoid them:
Mistake #1: Confusing 700c with 27.5" or 28"
These numbers may sound similar, but they refer to different wheel standards. A 700c wheel has a 622mm rim diameter, while a 27.5-inch wheel (ISO 584mm) and 28-inch wheels are sized differently.
Mistake #2: Measuring Tire Size Instead of Rim Diameter
Measuring from the ground to the top of the inflated tire gives the outer diameter, but this includes tire thickness not just the rim. For accurate sizing, focus on the rim’s diameter (622mm), not just the overall wheel size.
Mistake #3: Ignoring Fork Spacing
Your front fork spacing must match the motor wheel hub most KirbEbike front motor kits, including the 250W 700C kit, are built for 100mm fork spacing, which is standard on most road and hybrid bikes.
Always measure the distance between your fork dropouts to confirm compatibility.
Mistake #4: Overlooking Brake Compatibility
Some conversion kits only support either disc or V-brakes. The KirbEbike 250W 700C kit supports both — but it’s still important to verify your brake type before ordering.
Avoiding these mistakes ensures:
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A perfect fit on your first try
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A smooth installation process
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Safer and more efficient riding experience
Frequently Asked Questions: 700c Bike Wheel & Conversion Kits
What does 700c mean in bike wheels?
“700c” is a traditional French tire sizing term that refers to a road bike wheel with a rim diameter of 622mm, or roughly 29 inches including the tire. It’s one of the most common wheel sizes found on road, hybrid, and gravel bikes.
How big is a 700c bike wheel in inches?
A 700c bike wheel measures approximately 29 inches in outer diameter with a fully inflated tire. The rim itself (without tire) measures 622mm, or about 24.5 inches. This is the key measurement for ebike conversion compatibility.
Can I use a KirbEbike conversion kit on my 700c bike?
Yes! The KirbEbike 250W Front Motor Kit is fully compatible with 700c wheels. Just select “700C” in the wheel size dropdown when purchasing.
Will the KirbEbike 250W kit fit my road or hybrid bike?
Most likely, yes! The kit fits bikes with:
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700c wheels
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100mm front fork spacing
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V-brake or disc brake setups
If you’re unsure, measure your front fork and wheel diameter, or email the KirbEbike support team for help.
Do I need to buy a battery separately?
The base kit includes only the front motor wheel. You can choose to add a 36V 13Ah lithium battery at checkout or purchase it later. The battery provides a range of 35–45km, perfect for urban riding.
How long does installation take?
The KirbEbike 700c conversion kit installs in 20–30 minutes using basic tools. No advanced bike skills required!
Is the 250W KirbEbike kit road legal in the UK?
Yes! A 250W motor with a top speed of 25km/h (15.5mph) is fully legal for UK public roads — as long as pedal assist is used.
