Front gear selection help needed please

[JohnDoe1983]

Hi.
I have a Moustache FS5 2019 with a CX motor. The front gear is 15 teeth. My top speed is 30km/hr on flat road.
I want to go faster. What number of teeth would you recommend 17-18-19
What is the percentage gain for each choice before I order a gear ?
My rear is a SLX 11-42

Thank you very much for you help.

 

[Steve64]

Geez man. You read my mind. I was just thinking about this on the way home. I have exactly the same question. Just want a higher speed in smallest cog on rear

Of course need a bigger cog up front on fs7.

Thanks Steve

 

[JohnDoe1983]

I calculated that 30km hr on a 15 teeth.

17 teeth would give me around 34 km hr. Bosch do not recommend going over 2 teeth. Info from a dealer Scooteretti.com. I have the tool to do the job, only a torque wrench missing wich I ordered last night on Amazon.
here is the way to do this:

Bosch Lock Ring Seal

Bosch lock ring seal should be replaced every time the crank lockring is removed. This O-ring seal ensures a proper fit. Shop Scooteretti for Bosch Ebike Parts

shop.scooteretti.com

 

[Marcela]

This will keep you busy for a while.

Bicycle Gear Ratio Table | BikeCalc

Calculate gear ratios given chainring and sprocket (cog) sizes.

www.bikecalc.com

 

[JohnDoe1983]

Here is something interesting to calculate: https://www.bikecalc.com/gear_speed

 

[batmick1]

I went from the stock 18t to a 20t on my Haibike, also with the CX drive. Also have an 11 as the smallest cog in the back. I spin out around 35-36 mph, which is plenty fast enough for me. The other advantage is that for my regular commuting I am not constantly in the lowest one or two cogs and wear those out quickly.
Never saw the warning about not going too big (more than 2 teeth). It's amazing what you can accomplish when you don't know it's impossible. ;-)