Can you fit a sidecar on a 125cc bike?

Absolutely yes! it is possible to attach a sidecar to a 125cc motorcycle, but there are several important considerations and limitations to keep in mind:

  • All the sidecars I have seen on 125cc bikes have been a great success.
  • Engine Power: 125cc motorcycles are typically designed for single-rider use, and their engines may not be powerful enough to handle fast roads. It does cut down the top speed from say 65 mph to perhaps around 50mph. The additional weight and drag of a sidecar and its passenger all slow it down to some degree. Riding about town or out on empty country roads is what it would be best at. You could say that it’s not ideal for long distance or main roads but that is more down to your frame of mind and what you think is OK.
  • Motorcycle frame: Sidecar frame clamps may need spacers because the 125cc motorcycle frame tubes are generally smaller than the clamps are usually made for. Some frame bracing or additional mounting may be needed in some situations.

If you're interested in having a motorcycle with a sidecar, it's essential to consult with a knowledgeable motorcycle mechanic or specialist who can assess the feasibility and safety of adding a sidecar to your specific 125cc motorcycle model. They can guide you through the process and help you understand the potential impacts on the bike's performance and handling. Remember that safety should always be a top priority when modifying a motorcycle.

We offer a selection of new sidecars & fittings, please contact us for more details or with any questions which you may have. Call David 07808 572709 or e-mail

David Evans

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