Cappo
New Member
- Jul 16, 2026
- 3
- 0
Hi all, new here.
I have a Trek Rail+ which is only a few months old. The supplying dealer fitted a Speedbox from new, at my request, but it’s been nothing but trouble. Aside from the usability (compared to the Volspeed, which I’ve had on a previous bike) it also threw the Speed System error/Limp mode after about 70 miles (in total, from new!).
It’s been in and out of the shop and their most recent advice was to not use the Flow app at all. They told me that they had set the max power and torque for Turbo and EMTB modes and that those would remain active as long as I didn’t use the app.
When I rode it again, it certainly didn’t feel like it was giving full power, so I connected the bike to the app and checked, and everything was back to standard (80Nm etc). It seems it will only hold those settings if you use the app.
It’s actively affecting how I use the bike, as I’m constantly expecting another Limp Mode session, so I’ve decided to remove the Speedbox, and I’ll consider my options going forward (which may well be to sell the Trek and buy something older; I previously had a Cube Reaction with a Volspeed and never had a moment’s trouble). I’ve had the Trek 3 months or more and only done 120 miles total on it, as I constantly feel I need to be in range of the missus and the car to collect me if it fails again.
So, after my long ramble (sorry!) my question is, will the bike have retained any memory of the Speedbox (I guess Yes?) and more importantly will it now behave itself if I use it correctly, with full power via the app, and not throw further errors?
Thanks.
I have a Trek Rail+ which is only a few months old. The supplying dealer fitted a Speedbox from new, at my request, but it’s been nothing but trouble. Aside from the usability (compared to the Volspeed, which I’ve had on a previous bike) it also threw the Speed System error/Limp mode after about 70 miles (in total, from new!).
It’s been in and out of the shop and their most recent advice was to not use the Flow app at all. They told me that they had set the max power and torque for Turbo and EMTB modes and that those would remain active as long as I didn’t use the app.
When I rode it again, it certainly didn’t feel like it was giving full power, so I connected the bike to the app and checked, and everything was back to standard (80Nm etc). It seems it will only hold those settings if you use the app.
It’s actively affecting how I use the bike, as I’m constantly expecting another Limp Mode session, so I’ve decided to remove the Speedbox, and I’ll consider my options going forward (which may well be to sell the Trek and buy something older; I previously had a Cube Reaction with a Volspeed and never had a moment’s trouble). I’ve had the Trek 3 months or more and only done 120 miles total on it, as I constantly feel I need to be in range of the missus and the car to collect me if it fails again.
So, after my long ramble (sorry!) my question is, will the bike have retained any memory of the Speedbox (I guess Yes?) and more importantly will it now behave itself if I use it correctly, with full power via the app, and not throw further errors?
Thanks.
