The Bosch Purion 400 Retrofit Kit (BHU3500) Ñ 35.0 mm is the Purion 400 retrofit package sized for e-bikes with 35.0 mm diameter handlebars Ñ typically modern eMTBs and certain performance-oriented Smart System bikes. Complete kit with display, 35.0 mm mount, and all installation hardware.

What's Included

• Purion 400 display (BHU3500) Ñ 1.6" colour display
• 35.0 mm handlebar mount Ñ correct fit for oversized bars
• All hardware required for clean installation
• Customisation via Bosch eBike Flow app

Key Features

• Ideal eMTB cockpit Ñ compact, rugged, triangle-protected
• Splash- and dust-resistant for any weather
• Reliable wired connection to Smart System motor
• App connectivity for settings, modes, and firmware updates

Compatibility

Compatible with Bosch Smart System (BES3) motors (excluding BDU3781 Speed). Requires a 35.0 mm handlebar clamp area Ñ this standard is common on modern eMTBs and certain performance trekking bikes. Check your handlebar diameter before ordering Ñ the clamp will not flex to fit a different size.

Why 35.0 mm?

eMTB brands adopted 35.0 mm handlebars for the added stiffness and strength needed for aggressive trail use. If your e-bike shipped with a 35.0 mm cockpit, you need the 35.0 mm-matched Purion 400 kit.

Professional installation recommended for Smart System pairing via Bosch diagnostic tools. Genuine Bosch OE with warranty, same-day dispatch from upVolt.