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Speedbox 3.1 Tuning Kit for Specialized eBikes

Speedbox 3.1 Tuning Kit for Specialized eBikes

Removes 15mph Limit | Lifetime Warranty

In stock - ships in 24hrs
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Enjoy 30 days of free returns, with less than 1% of riders asking for their money back — plus a full warranty on all tuning kits.

Enjoy plug & ride tuning with this kit for Specialized eBikes (excluding Gen4 Levo). Fitted to the TCU in minutes, it will be permanently active once fitted, giving you a maximum speed of around 45km/h. Riders also have the option to set a custom max speed if the bike has a TCU with digital readouts

  • Works with all Specialized brand eBikes with a TCU on the top tube. Including SL versions with Mastermind TCUs but excluding Gen4 Levo
  • Please note, speed readings in the Mission Control app may not display correctly

⚠️ For off-road use only. Not legal on public roads. Read full legal disclaimer.

Will this kit work with my bike?

  • Works with Specialized brand eBikes fitted with TCU displays (on top tube)
  • This kit does not work with Specialized SL models. Or bikes fitted with TCD display on handlebars

How long does it take to fit?

We've rated this as an Easy, plug & ride installation

What is your shipping & returns policy?

We ship fast and free to the UK via Royal Mail Tracked 48. Tracked 24 is available as a paid option.

🇺🇸 USA

Free shipping on all orders

Your parcel is exported from the UK and handed to USPS for final delivery.

All tariff charges and import paperwork is handled by us. No surprise customs bills on arrival.

🇦🇺 Australia

Free shipping on all orders.

Parcels are delivered by Australia Post once they reach your local network.

We manage all import paperwork, so you won’t receive any unexpected fees.

🇨🇦 Canada

Shipped from the UK with full tracking via FedEx

Canadian orders may be subject to import duties or customs charges on arrival.

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Changed your mind? No problem. We offer 30-day returns — no hassle, no stress.

If something’s not right, we’ll sort it.

🔍 See full Shipping & Returns info here

What's covered by the Lifetime Warranty?

All Speedbox products come with a lifetime warranty. In the unlikely event your product develops a fault or defect. We will replace it for free.

To claim under warranty, simply contact us here

eBike firmware Updates

Updating your eBike’s motor firmware may block or disable your tuning kit.

We recommend avoiding firmware updates especially through service centres unless absolutely necessary. Most updates are optional, and a working eBike doesn’t usually need one.

Keep in mind:

✔ Firmware upgrades can remove tuning compatibility

✔ Tuning is only guaranteed to work with the firmware version available at time of purchase

✔ A blocked tuning kit due to a firmware update is not covered under warranty

If you’re unsure, reach out before updating. We’re here to help you keep your ride running exactly how you like it.

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