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BTWIN City Speed 900E
The tuning is automatically switched off each time the bike is turned on
28-37mph (~45-60km/h) can be expected
Chip software version information settings
SPEEDi for Trek Powerfly FS 4 (2021 - 2022) surron tire tube BTWIN City Speed 900EThe SPEEDi is an e bike speed limit increaser. Designed, tested and manufactered in New Zealand, our SPEEDi uses a mechanical planetary gear system to increase your standard e bike speed limit by 1. 5. Please note that the SPEEDi is very specific to the chosen Bike, Hub and Disc setup. Please don't assume that because your bike is similar it will fit, as it likely won't. If you're not 100% sure, please contact us. Please refer to the Hub picture