A Trek FX+ 2 (Bosch smart system) charges through the Bosch smart-system round charge port at 4 A. The exact charger to buy for it, and the look-alike unit that will not work.
Updated 05 September 2026.
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Bosch Smart System (BES3)Which charger fits a Trek FX+ 2 (Bosch smart system)?
The charger that fits a Trek FX+ 2 (Bosch smart system), the connector it uses, and the wrong unit to avoid.
Use the Bosch Standard Charger 4A (smart system). A Trek FX+ 2 (Bosch smart system) charges through the Bosch smart-system round charge port at 4 A, so the correct charger is the Bosch Standard Charger 4A (smart system).
| Bike | Trek FX+ 2 (Bosch smart system) |
|---|---|
| Drive system | Bosch Smart System (BES3) |
| Charger to buy | Bosch Standard Charger 4A (smart system) |
| Connector | Bosch smart-system round charge port |
| Output | 36 V nominal pack |
A Trek FX+ 2 (Bosch smart system) runs the Bosch Smart System (BES3) and charges through the Bosch smart-system round charge port. The matching charger is the Bosch Standard Charger 4A (smart system) at 4 A.
The Bosch smart-system 4 A charger fills a PowerTube 750 in about six hours and a 500 in about 4.5 hours. It uses the round smart-system plug and will not correctly serve a BES2 oval-port bike.
Questions and answers
Which charger fits a Trek FX+ 2 (Bosch smart system)?
Use the Bosch Standard Charger 4A (smart system). A Trek FX+ 2 (Bosch smart system) charges through the Bosch smart-system round charge port at 4 A, so the correct charger is the Bosch Standard Charger 4A (smart system).