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Whats the difference between the 250w & 350w Bosch eBike motors? - Explained
By Martin Brown |

So exactly what is the difference you may ask?
Well, they are programmed slightly different. The 350w speed pedelec has an assisted speed to 45 km/h and the 250w motor is assisted to 25 km/h. Everything else is exactly the same. The maximum and minimum assistance levels, the maximum torque & the motor RPM all stay the same between both types. Oh and the 350w motor has a Red Bosch logo on the side whereas the 250w has a grey logo, so they are easily distinguished.Also, it's worth noting the new CX line developed with more torque and assistance (not available in the 350w version. See the table below for factual differences:-
Bosch Performance 350w |
Bosch Performance CX 250w |
|
Assistance |
275% |
300% |
Torque |
60Nm |
75Nm |
Assisted Speed |
45 km/h |
25 km/h (50 km/h Tuned) |
So whats the point in 2 drive types?
Its simple.. One can reach higher assisted speeds than the other.Who uses Speed pedelecs?
Some European countries have guidelines and procedures in place for Speed Pedelecs (eBikes over 250w & 25 km/h). For example in Germany certain laws allow you to register your 350w eBike and pay a yearly rate to ride a Speed Pedelec on the road. There are certain rules that stipulate a cycle helmet must be worn, the eBike must have a side stand, lights and a licence plate holder. Over here it is classed as a motor vehicle so you would have to be licensed and hold appropriate insurance. There is currently no regulations in place to license a Speed pedelec.It's worth noting at this point that the German market is way ahead of us here in the UK. So if their market is so advanced and they have regulations in place is everyone on an 'S' pedelec? You would think so, however, you'll be surprised to hear that out of the 400,000 electric bikes sold annually in Germany, only around 5,000 of these are Speed pedelecs. Only a tiny percentage ey?Is it illegal to use a 350w Bosch motor here in the UK?
On the road... Yes (Unless you take the appropriate actions to license the eBike). You may wish to use the eBike on private land with the permission of the land owner. If you do use a 350w motor here on the road, you are riding your eBike illegally. You do run the risk of having your eBike taken by the authorities. If you are involved in an accident, you are responsible for the damages/injury involved for both yourself and the 3rd party.So I want a 250w Motor but how can I go faster?
We do provide a Bosch speed tuning dongle for all of our Bosch powered eBikes. This is a device that is 'plumbed' into the motor that can alter the speed cut off of the eBike. It allows you to travel as fast as you want to be assisted by the motor off road (private land) of course. This can easily be unplugged when you are on the road, then easily plugged back into derestrict as required. By using a 250w motor it means that you have a legal bike that can be easily derestricted when needed.