Which Size Stem is compatible with my bike, standard or oversized?Updated a month ago
The main factor in determining compatibility of a stem with your bike is the stem clamp diameter, where the stem clamps to the steerer tube of your fork! Stems clamp directly onto the steerer, so the internal diameter of the stem must match the external diameter of the steerer tube. Almost all modern bikes will have a standard 1 1/8" stem clamp diameter with a few exceptions. Giant, Canyon and Scott are the three brands who have deviated from the industry standard to include "oversized" 1 1/4" stem/steerer clamp diameters.
How do I find the stem clamp/steerer diameter?
Option 1:
Manufacturer's Website Check
Before you start measuring, check your bicycle manufacturer's website. Most manufacturers will list the full component specifications (specs) for your specific bike model, including the stem diameter. Look under the "Geometry," "Specs," or "Components" tab for your model year.
Option 2:
Measure the outer diameter (OD) of the steerer tube after removing your existing stem.
Remove the top cap and loosen the stem clamp bolts.
Slide the stem and any spacers off the steerer tube.
Use a digital caliper to measure the exposed OD of the steerer tube.
The measurement will correspond to one of these two modern, threadless standards:
| Steerer Tube Size Standard (imperial) | Outer Diameter (OD) Measurement (metric) | Stem Clamp Size | Commonality |
| 1 1/8" (Standard) | 28.6 mm | 28.6 mm | Most common on modern bikes. |
| 1 1/4" (Oversized) | 31.8 mm | 31.8 mm | Less common, but frequently used by brands like Canyon, Scott, and Giant. |
If you are unsure or unable to take measurements, please reach out to us with a link to your bicycle model or a photo of your bike so that our support team is able to assist you in determining your steerer tube size!