• Warning!!

    Riding a tuned or deristricted EMTB is not a trivial offence and can have serious legal consequences. Also, many manufacturers can detect the use of a tuning device or deristricting method and may decline a repair under warranty if it was modified from the intended original specification. Deristricting EMTB's can also add increased loads for motors and batteries. Riding above the local law limit may reclassify the bike as a low-powered bike, requiring insurance, registration and a number plate.

    Be aware of your local country laws. Many laws prohibit use of modified EMTB's. It is your responsibility to check local laws. Ignoring it, has potential implications to trail access, and risk of prosecution in the event of an accident.

    UK Pedelec Law

    Worldwide Laws

    We advise members great caution. EMTB Forums accepts no liability for any content or advice given here. 

BadassBox 5 Bosch Rim 37 (rim magnet/smart system)

Servicepoint

Member
Joined
Apr 28, 2025
Messages
10
Reaction score
3
Location
Glasgow
First of all apologies for starting another thread, I asked this question on the main thread but didn't get a response so maybe it went unnoticed.

Has anyone any experience of the BadassBox 5? I would like to tune my Emtb as when I get faster than the restricted speed I find there is quite a bit of drag on the motor, the Badass appeals as it doesn't require major fitting and I don't really want to drop the motor down to fit any other kit.
My bike is a Scott Patron 920 and the Bosch CX motor is swung up between the frame to allow a bigger battery compartment so I'm unsure if this would make fitting any more difficult. It has the rim/tyre magnet and smart system

Any information and experience on the Badass 5 would be greatly appreciated.
 
⚡ EMTB Pro Go Pro — Living Intelligence Reports, exclusive discounts & ad-free Up to 25% off Peaty's, PEMBREE, Magicshine & more · Ad-free browsing · Pro badge See the deals →
I asked badassbox if this version 5 for rim 37 can accept riding in turbo mode all the time
Anwser is no, change bike.
 
I asked badassbox if this version 5 for rim 37 can accept riding in turbo mode all the time
Anwser is no, change bike.
Thanks. That’s not so good.
I certainly don’t want to “brick” the motor so I’ll hold off ordering, hopefully someone is working on a decent way round the smart system and rim magnet.
 
I asked badassbox if this version 5 for rim 37 can accept riding in turbo mode all the time
Anwser is no, change bike.
There is no solution on the market yet that would guarantee that you will not get an error. Maybe in future.
 
The speed fun furious evo+ for rim magnet has very good reviews but currently very low availability...
 
Has anyone had any luck with either the BadassBox 5 or speedfun, and not had any errors?
Not looking to ride above the limit for extended periods, if that's what causes the issues
 
Has anyone had any luck with either the BadassBox 5 or speedfun, and not had any errors?
Not looking to ride above the limit for extended periods, if that's what causes the issues
Badassbox 5 installed, and works without problems so far. I uninstalled the ebikeflow app and removed the phone's Bluetooth pairing with the bike. Gen5 Performance line
 
keep us updated !
Only 150km just driven with the box. The top speed has been 48km/h on a flat surface. However, I mainly ride trails and the speeds remain in the moderate range of 12-35km/h. And I vary the level of assistance. Mainly emtb mode. Driving is a lot more fun than before. No problems or errors so far. 👍
 
I am looking at the badass box but am I correct in thinking with it installed you won’t be able to upgrade to the new 100nm update?
 
Yea that’s a shame, so not really a good idea even with the old software?
 
Hi, I have been using it for 500km now without any problems. Also my friend is using it and no issues there. Not even one single error.

I even use bosch flow app on every ride and updated the software to get the EMTB+. I really think this is the only tune that really works (tried speedbox before). And installation is super easy!
 
Yeah me too
Gen 4 Smart System 11 000km si far without single errors
Running with Simplek pro nano and old software
 
Hi, I have been using it for 500km now without any problems. Also my friend is using it and no issues there. Not even one single error.

I even use bosch flow app on every ride and updated the software to get the EMTB+. I really think this is the only tune that really works (tried speedbox before). And installation is super easy!
Is that with the new 100nm update installed?
 
Keep reading
    Browse all

    Similar Threads

    Community Stats

    Since 2018
    670K
    Messages
    41,155
    Members
    Join 30,000+ Riders, it's free!
    Back
    Top