badass Type3.4 Bosch Tuning Kit, Black, One size

I ride a Trek FS mountain bike with a 20 mph engine assist cut-off. On a fire road or a trail this cap is not a problem, and 20 mph felt like plenty, considering I mostly needed the engine assist going up-hill.However, when commuting it was a different story. The problem with my previous set-up was that I would typically commute at 22 mph, and thus not benefit from the engine assist... Now I typically ride 25-30 mph, and with my current cogs I spin out at about 35 mph, on level ground.With this little tuning set, my mountain bike is just as good for commuting as it is for the trail.A very happy customer!

So far very good puts a smile in your face going up hills at 30mph so easy just get one easy to fit and take off 2 mins of a job unbelievable

Works fine. It scrambles the speed reading once you go past 10mph but that's obviously how it does away with the 'restriction'. These motors are made for up to 30+mph assistance anyways for most parts of the world. It's very easy to put on ... had to switch magnet to alternative side of spokes and that's it.

No English instructions but the diagrams speak for themselves. It does EXACTLY like it should. If it doesn't work for you, check the position of the magnet and make sure you have a working battery.

Does what it says it will do, and so simple to fit, and take off. Its expensive for what it is, however i'm glad i went ahead and got one.

This is so easy to put on and so fixes the felling that the bike goes dead at 19.5 MPH the best thing I have gotten for this bike !!!

Works as advertised . Could not be easier to install. This devise takes away the only complaint I had with the Bosch motor (20 mph max).

Highly recommend this product.Unlocked the true potential of my e-bike, it's great going uphill with no struggle at all! Keeping up with cars also makes me feel safer on the roads.